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BMP now uses a reasonable resolution, and customizable using the "dpi" option.

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This commit is contained in:
gcq 2014-06-28 22:18:47 +02:00
parent 3f5b15ff31
commit 103354facc
1 changed files with 22 additions and 15 deletions
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37
PIL/BmpImagePlugin.py
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@ -203,30 +203,37 @@ def _save(im, fp, filename, check=0):
if check: if check:
return check return check
info = im.encoderinfo
dpi = info.get("dpi", (96, 96))
# 1 meter == 39.3701 inches
ppm = map(lambda x: int(x * 39.3701), dpi)
stride = ((im.size[0]*bits+7)//8+3)&(~3) stride = ((im.size[0]*bits+7)//8+3)&(~3)
header = 40 # or 64 for OS/2 version 2 header = 40 # or 64 for OS/2 version 2
offset = 14 + header + colors * 4 offset = 14 + header + colors * 4
image = stride * im.size[1] image = stride * im.size[1]
# bitmap header # bitmap header
fp.write(b"BM" + # file type (magic) fp.write(b"BM" + # file type (magic)
o32(offset+image) + # file size o32(offset+image) + # file size
o32(0) + # reserved o32(0) + # reserved
o32(offset)) # image data offset o32(offset)) # image data offset
# bitmap info header # bitmap info header
fp.write(o32(header) + # info header size fp.write(o32(header) + # info header size
o32(im.size[0]) + # width o32(im.size[0]) + # width
o32(im.size[1]) + # height o32(im.size[1]) + # height
o16(1) + # planes o16(1) + # planes
o16(bits) + # depth o16(bits) + # depth
o32(0) + # compression (0=uncompressed) o32(0) + # compression (0=uncompressed)
o32(image) + # size of bitmap o32(image) + # size of bitmap
o32(1) + o32(1) + # resolution o32(ppm[0]) + o32(ppm[1]) + # resolution
o32(colors) + # colors used o32(colors) + # colors used
o32(colors)) # colors important o32(colors)) # colors important
fp.write(b"\0" * (header - 40)) # padding (for OS/2 format) fp.write(b"\0" * (header - 40)) # padding (for OS/2 format)
if im.mode == "1": if im.mode == "1":
for i in (0, 255): for i in (0, 255):