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Merge pull request #4047 from radarhere/modes

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Documented more limited support modes
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Hugo van Kemenade 2019-09-05 23:20:24 +03:00 committed by GitHub
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2 changed files with 19 additions and 6 deletions
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23
docs/handbook/concepts.rst
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@ -44,11 +44,24 @@ supports the following standard modes:
* ``I`` (32-bit signed integer pixels)
* ``F`` (32-bit floating point pixels)
PIL also provides limited support for a few special modes, including ``LA`` (L
with alpha), ``RGBX`` (true color with padding) and ``RGBa`` (true color with
premultiplied alpha). However, PIL doesn’t support user-defined modes; if you
need to handle band combinations that are not listed above, use a sequence of
Image objects.
Pillow also provides limited support for a few special modes, including:
* ``LA`` (L with alpha)
* ``PA`` (P with alpha)
* ``RGBX`` (true color with padding)
* ``RGBa`` (true color with premultiplied alpha)
* ``La`` (L with premultiplied alpha)
* ``I;16`` (16-bit unsigned integer pixels)
* ``I;16L`` (16-bit little endian unsigned integer pixels)
* ``I;16B`` (16-bit big endian unsigned integer pixels)
* ``I;16N`` (16-bit native endian unsigned integer pixels)
* ``BGR;15`` (15-bit reversed true colour)
* ``BGR;16`` (16-bit reversed true colour)
* ``BGR;24`` (24-bit reversed true colour)
* ``BGR;32`` (32-bit reversed true colour)
However, Pillow doesn’t support user-defined modes; if you need to handle band
combinations that are not listed above, use a sequence of Image objects.
You can read the mode of an image through the :py:attr:`~PIL.Image.Image.mode`
attribute. This is a string containing one of the above values.

2
src/libImaging/Storage.c
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@ -132,7 +132,7 @@ ImagingNewPrologueSubtype(const char *mode, int xsize, int ysize, int size)
} else if (strcmp(mode, "BGR;15") == 0) {
/* EXPERIMENTAL */
/* 15-bit true colour */
/* 15-bit reversed true colour */
im->bands = 1;
im->pixelsize = 2;
im->linesize = (xsize*2 + 3) & -4;