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579 lines
16 KiB
HTML
579 lines
16 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<title>BMP Suite Image List</title>
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<style>
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.b { background:url(bkgd.png); }
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.q { background-color:#fff0e0; }
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.bad { background-color:#ffa0a0; }
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</style>
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</head>
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<body>
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<h1>BMP Suite Image List</h1>
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<p><i>For <a href="http://entropymine.com/jason/bmpsuite/">BMP Suite</a>
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version 2.3</i></p>
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<p>This document describes the images in <i>BMP Suite</i>, and shows what
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I allege to be the correct way to interpret them. PNG and JPEG images are
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used for reference.
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</p>
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<p>It also shows how your web browser displays the BMP images,
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but that’s not its main purpose.
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BMP is poor image format to use on web pages, so a web browser’s
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level of support for it is arguably not important.</p>
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<table border=1 cellpadding=8>
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<tr>
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<th>File</th>
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<th>Ver.</th>
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<th>Correct display</th>
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<th>In your browser</th>
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<th>Notes</th>
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</tr>
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<tr>
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<td>g/pal1.bmp</td>
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<td>3</td>
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<td class=b><img src="pal1.png"></td>
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<td class=b><img src="../g/pal1.bmp"></td>
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<td>1 bit/pixel paletted image, in which black is the first color in
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the palette.</td>
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</tr>
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<tr>
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<td>g/pal1wb.bmp</td>
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<td>3</td>
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<td class=b><img src="pal1.png"></td>
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<td class=b><img src="../g/pal1wb.bmp"></td>
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<td>1 bit/pixel paletted image, in which white is the first color in
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the palette.</td>
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</tr>
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<tr>
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<td>g/pal1bg.bmp</td>
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<td>3</td>
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<td class=b><img src="pal1bg.png"></td>
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<td class=b><img src="../g/pal1bg.bmp"></td>
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<td>1 bit/pixel paletted image, with colors other than black and white.</td>
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</tr>
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<tr>
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<td class=q>q/pal1p1.bmp</td>
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<td>3</td>
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<td class=b><img src="pal1p1.png"></td>
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<td class=b><img src="../q/pal1p1.bmp"></td>
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<td>1 bit/pixel paletted image, with only one color in the palette.
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The documentation says that 1-bpp images have a palette size of 2
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(not “up to 2”), but it would be silly for a viewer not to
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support a size of 1.</td>
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</tr>
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<tr>
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<td class=q>q/pal2.bmp</td>
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<td>3</td>
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<td class=b><img src="pal2.png"></td>
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<td class=b><img src="../q/pal2.bmp"></td>
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<td>A paletted image with 2 bits/pixel. Usually only 1, 4,
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and 8 are allowed, but 2 is legal on Windows CE.</td>
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</tr>
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<tr>
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<td>g/pal4.bmp</td>
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<td>3</td>
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<td class=b><img src="pal4.png"></td>
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<td class=b><img src="../g/pal4.bmp"></td>
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<td>Paletted image with 12 palette colors, and 4 bits/pixel.</td>
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</tr>
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<tr>
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<td>g/pal4rle.bmp</td>
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<td>3</td>
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<td class=b><img src="pal4.png"></td>
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<td class=b><img src="../g/pal4rle.bmp"></td>
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<td>4-bit image that uses RLE compression.</td>
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</tr>
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<tr>
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<td class=q>q/pal4rletrns.bmp</td>
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<td>3</td>
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<td class=b><img src="pal4rletrns.png"><br>
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or<br><img src="pal4rletrns-0.png"><br>
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or<br><img src="pal4rletrns-b.png"></td>
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<td class=b><img src="../q/pal4rletrns.bmp"></td>
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<td>An RLE-compressed image that used “delta”
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codes to skip over some pixels, leaving them undefined. Some viewers
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make undefined pixels transparent, others make them black, and
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others assign them palette color 0 (purple, in this case).</td>
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</tr>
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<tr>
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<td>g/pal8.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8.bmp"></td>
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<td>Our standard paletted image, with 252 palette colors, and 8
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bits/pixel.</td>
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</tr>
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<tr>
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<td>g/pal8-0.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8-0.bmp"></td>
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<td>Every field that can be set to 0 is set to 0: pixels/meter=0;
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colors used=0 (meaning the default 256); size-of-image=0.</td>
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</tr>
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<tr>
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<td>g/pal8rle.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8rle.bmp"></td>
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<td>8-bit image that uses RLE compression.</td>
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</tr>
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<tr>
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<td class=q>q/pal8rletrns.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8rletrns.png"><br>
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or<br><img src="pal8rletrns-0.png"><br>
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or<br><img src="pal8rletrns-b.png"></td>
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<td class=b><img src="../q/pal8rletrns.bmp"></td>
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<td>8-bit version of q/pal4rletrns.bmp.</td>
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</tr>
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<tr>
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<td>g/pal8w126.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8w126.png"></td>
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<td class=b><img src="../g/pal8w126.bmp"></td>
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<td rowspan=3>Images with different widths and heights.
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In BMP format, rows are padded to a multiple of four bytes, so we
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test all four possibilities.</td>
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</tr>
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<tr>
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<td>g/pal8w125.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8w125.png"></td>
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<td class=b><img src="../g/pal8w125.bmp"></td>
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</tr>
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<tr>
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<td>g/pal8w124.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8w124.png"></td>
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<td class=b><img src="../g/pal8w124.bmp"></td>
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</tr>
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<tr>
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<td>g/pal8topdown.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8topdown.bmp"></td>
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<td>BMP images are normally stored from the bottom up, but
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there is a way to store them from the top down.</td>
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</tr>
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<tr>
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<td class=q>q/pal8offs.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../q/pal8offs.bmp"></td>
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<td>A file with some unused bytes between the palette and the
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image. This is probably valid, but I’m not 100% sure.</td>
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</tr>
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<tr>
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<td class=q>q/pal8oversizepal.bmp</td>
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<td>3</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../q/pal8oversizepal.bmp"></td>
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<td>An 8-bit image with 300 palette colors. This may be invalid,
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because the documentation could
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be interpreted to imply that 8-bit images aren’t allowed
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to have more than 256 colors.</td>
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</tr>
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<tr>
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<td>g/pal8nonsquare.bmp</td>
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<td>3</td>
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<td class=b>
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<img src="pal8nonsquare-v.png"><br>
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or<br>
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<img src="pal8nonsquare-e.png">
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</td>
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<td class=b><img src="../g/pal8nonsquare.bmp"></td>
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<td>An image with non-square pixels: the X pixels/meter is twice
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the Y pixels/meter. Image <i>editors</i> can be expected to
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leave the image “squashed”; image <i>viewers</i> should
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consider stretching it to its correct proportions.</td>
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</tr>
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<tr>
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<td>g/pal8os2.bmp</td>
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<td>OS/2v1</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8os2.bmp"></td>
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<td>An OS/2-style bitmap.</td>
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</tr>
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<tr>
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<td class=q>q/pal8os2sp.bmp</td>
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<td>OS/2v1</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../q/pal8os2sp.bmp"></td>
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<td>An OS/2v1 with a less-than-full-sized palette.
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Probably not valid, but such files have been seen in the wild.</td>
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</tr>
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<tr>
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<td class=q>q/pal8os2v2.bmp</td>
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<td>OS/2v2</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../q/pal8os2v2.bmp"></td>
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<td>My attempt to make an OS/2v2 bitmap.</td>
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</tr>
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<tr>
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<td class=q>q/pal8os2v2-16.bmp</td>
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<td>OS/2v2</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../q/pal8os2v2-16.bmp"></td>
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<td>An OS/2v2 bitmap whose header has only 16 bytes, instead of the full 64.</td>
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</tr>
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<tr>
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<td>g/pal8v4.bmp</td>
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<td>4</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8v4.bmp"></td>
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<td>A v4 bitmap. I’m not sure that the gamma and chromaticity values in
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this file are sensible, because I can’t find any detailed documentation
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of them.</td>
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</tr>
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<tr>
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<td>g/pal8v5.bmp</td>
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<td>5</td>
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<td class=b><img src="pal8.png"></td>
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<td class=b><img src="../g/pal8v5.bmp"></td>
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<td>A v5 bitmap. Version 5 has additional colorspace options over v4, so it
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is easier to create, and ought to be more portable.</td>
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</tr>
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<tr>
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<td>g/rgb16.bmp</td>
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<td>3</td>
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<td class=b><img src="rgb16.png"></td>
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<td class=b><img src="../g/rgb16.bmp"></td>
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<td>A 16-bit image with the default color format: 5 bits each for red,
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green, and blue, and 1 unused bit.
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The whitest colors should (I assume) be displayed as pure white:
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<span style="background-color:rgb(255,255,255)">(255,255,255)</span>, not
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<span style="background-color:rgb(248,248,248)">(248,248,248)</span>.</td>
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</tr>
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<tr>
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<td>g/rgb16-565.bmp</td>
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<td>3</td>
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<td class=b><img src="rgb16-565.png"></td>
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<td class=b><img src="../g/rgb16-565.bmp"></td>
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<td>A 16-bit image with a BITFIELDS segment indicating 5 red, 6 green,
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and 5 blue bits. This is a standard 16-bit format, even supported by
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old versions of Windows that don’t support any other non-default 16-bit
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formats.
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The whitest colors should be displayed as pure white:
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<span style="background-color:rgb(255,255,255)">(255,255,255)</span>, not
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<span style="background-color:rgb(248,252,248)">(248,252,248)</span>.</td>
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</tr>
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<tr>
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<td>g/rgb16-565pal.bmp</td>
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<td>3</td>
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<td class=b><img src="rgb16-565.png"></td>
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<td class=b><img src="../g/rgb16-565pal.bmp"></td>
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<td>A 16-bit image with both a BITFIELDS segment and a palette.</td>
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</tr>
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|
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<tr>
|
||
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<td class=q>q/rgb16-231.bmp</td>
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<td>3</td>
|
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<td class=b><img src="rgb16-231.png"></td>
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<td class=b><img src="../q/rgb16-231.bmp"></td>
|
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<td>An unusual and silly 16-bit image, with 2 red bits, 3 green bits, and 1
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blue bit. Most viewers do support this image, but the colors may be darkened
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with a yellow-green shadow. That’s because they’re doing simple
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bit-shifting (possibly including one round of bit replication), instead of
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proper scaling.</td>
|
||
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</tr>
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<tr>
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<td class=q>q/rgba16-4444.bmp</td>
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<td>5</td>
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<td class=b><img src="rgba16-4444.png"></td>
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<td class=b><img src="../q/rgba16-4444.bmp"></td>
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<td>A 16-bit image with an alpha channel. There are 4 bits for each color
|
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channel, and 4 bits for the alpha channel.
|
||
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It’s not clear if this is valid, but I can’t find anything that
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suggests it isn’t.
|
||
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</td>
|
||
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</tr>
|
||
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|
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<tr>
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<td>g/rgb24.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../g/rgb24.bmp"></td>
|
||
|
|
<td>A perfectly ordinary 24-bit (truecolor) image.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td>g/rgb24pal.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../g/rgb24pal.bmp"></td>
|
||
|
|
<td>A 24-bit image, with a palette containing 256 colors. There is little if
|
||
|
|
any reason for a truecolor image to contain a palette, but it is legal.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb24largepal.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../q/rgb24largepal.bmp"></td>
|
||
|
|
<td>A 24-bit image, with a palette containing 300 colors.
|
||
|
|
The fact that the palette has more than 256 colors may cause some viewers
|
||
|
|
to complain, but the documentation does not mention a size limit.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb24prof.bmp</td>
|
||
|
|
<td>5</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../q/rgb24prof.bmp"></td>
|
||
|
|
<td>My attempt to make a BMP file with an embedded color profile.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb24lprof.bmp</td>
|
||
|
|
<td>5</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../q/rgb24lprof.bmp"></td>
|
||
|
|
<td>My attempt to make a BMP file with a linked color profile.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb24jpeg.bmp</td>
|
||
|
|
<td>5</td>
|
||
|
|
<td class=b><img src="rgb24.jpg"></td>
|
||
|
|
<td class=b><img src="../q/rgb24jpeg.bmp"></td>
|
||
|
|
<td rowspan=2>My attempt to make BMP files with embedded JPEG and PNG images.
|
||
|
|
These are not likely to be supported by much of anything (they’re
|
||
|
|
intended for printers).</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb24png.bmp</td>
|
||
|
|
<td>5</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../q/rgb24png.bmp"></td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td>g/rgb32.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../g/rgb32.bmp"></td>
|
||
|
|
<td>A 32-bit image using the default color format for 32-bit images (no
|
||
|
|
BITFIELDS segment). There are 8 bits per color channel, and 8 unused
|
||
|
|
bits. The unused bits are set to 0.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td>g/rgb32bf.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../g/rgb32bf.bmp"></td>
|
||
|
|
<td>A 32-bit image with a BITFIELDS segment. As usual, there are 8 bits per
|
||
|
|
color channel, and 8 unused bits. But the color channels are in an unusual
|
||
|
|
order, so the viewer must read the BITFIELDS, and not just guess.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb32fakealpha.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"><br>
|
||
|
|
or<br>
|
||
|
|
<img class=b src="fakealpha.png">
|
||
|
|
</td>
|
||
|
|
<td class=b><img src="../q/rgb32fakealpha.bmp"></td>
|
||
|
|
<td>Same as g/rgb32.bmp, except that the unused bits are set to something
|
||
|
|
other than 0.
|
||
|
|
If the image becomes transparent toward the bottom, it probably means
|
||
|
|
the viewer uses heuristics to guess whether the undefined
|
||
|
|
data represents transparency.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgb32-111110.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgb24.png"></td>
|
||
|
|
<td class=b><img src="../q/rgb32-111110.bmp"></td>
|
||
|
|
<td>A 32 bits/pixel image, with all 32 bits used: 11 each for red and
|
||
|
|
green, and 10 for blue. As far as I know, this is perfectly valid, but it
|
||
|
|
is unusual.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgba32.bmp</td>
|
||
|
|
<td>5</td>
|
||
|
|
<td class=b><img src="rgba32.png"></td>
|
||
|
|
<td class=b><img src="../q/rgba32.bmp"></td>
|
||
|
|
<td>A BMP with an alpha channel. Transparency is barely documented,
|
||
|
|
so it’s <i>possible</i> that this file is not correctly formed.
|
||
|
|
The color channels are in an unusual order, to prevent viewers from
|
||
|
|
passing this test by making a lucky guess.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=q>q/rgba32abf.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b><img src="rgba32.png"></td>
|
||
|
|
<td class=b><img src="../q/rgba32abf.bmp"></td>
|
||
|
|
<td>An image of type BI_ALHPABITFIELDS. Supposedly, this was used on
|
||
|
|
Windows CE. I don’t know whether it is constructed correctly.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badbitcount.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badbitcount.bmp"></td>
|
||
|
|
<td>Header indicates an absurdly large number of bits/pixel.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badbitssize.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badbitssize.bmp"></td>
|
||
|
|
<td>Header incorrectly indicates that the bitmap is several GB in size.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/baddens1.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/baddens1.bmp"></td>
|
||
|
|
<td rowspan=2>Density (pixels per meter) suggests the image is <i>much</i>
|
||
|
|
larger in one dimension than the other.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/baddens2.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/baddens2.bmp"></td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badfilesize.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badfilesize.bmp"></td>
|
||
|
|
<td>Header incorrectly indicates that the file is several GB in size.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badheadersize.bmp</td>
|
||
|
|
<td>?</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badheadersize.bmp"></td>
|
||
|
|
<td>Header size is 66 bytes, which is not a valid size for any known BMP
|
||
|
|
version.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badpalettesize.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badpalettesize.bmp"></td>
|
||
|
|
<td>Header incorrectly indicates that the palette contains an absurdly large
|
||
|
|
number of colors.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badplanes.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badplanes.bmp"></td>
|
||
|
|
<td>The “planes” setting, which is required to be 1, is not 1.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badrle.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badrle.bmp"></td>
|
||
|
|
<td>An invalid RLE-compressed image that tries to cause buffer overruns.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/badwidth.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/badwidth.bmp"></td>
|
||
|
|
<td>The image claims to be a negative number of pixels in width.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/pal8badindex.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/pal8badindex.bmp"></td>
|
||
|
|
<td>Many of the palette indices used in the image are not present in the
|
||
|
|
palette.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/reallybig.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/reallybig.bmp"></td>
|
||
|
|
<td>An image with a very large reported width and height.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/rletopdown.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/rletopdown.bmp"></td>
|
||
|
|
<td>An RLE-compressed image that tries to use top-down orientation,
|
||
|
|
which isn’t allowed.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
<tr>
|
||
|
|
<td class=bad>b/shortfile.bmp</td>
|
||
|
|
<td>3</td>
|
||
|
|
<td class=b>N/A</td>
|
||
|
|
<td class=b><img src="../b/shortfile.bmp"></td>
|
||
|
|
<td>A file that has been truncated in the middle of the bitmap.</td>
|
||
|
|
</tr>
|
||
|
|
|
||
|
|
</table>
|
||
|
|
|
||
|
|
</body>
|
||
|
|
|
||
|
|
</html>
|