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Merge pull request #150 from d-schmidt/master

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fixing save of transparency palette png-images
This commit is contained in:
Alex Clark ☺ 2013-03-21 13:22:46 -07:00
commit 2e888483a6
1 changed files with 7 additions and 4 deletions
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11
PIL/PngImagePlugin.py
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@ -70,7 +70,7 @@ _MODES = {
}
_simple_palette = re.compile(b'^\xff+\x00+$')
_simple_palette = re.compile(b'^\xff+\x00\xff*$')
# --------------------------------------------------------------------
# Support classes. Suitable for PNG and related formats like MNG etc.
@ -550,11 +550,14 @@ def _save(im, fp, filename, chunk=putchunk, check=0):
if "transparency" in im.encoderinfo:
if im.mode == "P":
transparency = max(0, min(255, im.encoderinfo["transparency"]))
alpha = b'\xFF' * transparency + b'\0'
# limit to actual palette size
alpha_bytes = 2**bits
chunk(fp, b"tRNS", alpha[:alpha_bytes])
if isinstance(im.encoderinfo["transparency"], bytes):
chunk(fp, b"tRNS", im.encoderinfo["transparency"][:alpha_bytes])
else:
transparency = max(0, min(255, im.encoderinfo["transparency"]))
alpha = b'\xFF' * transparency + b'\0'
chunk(fp, b"tRNS", alpha[:alpha_bytes])
elif im.mode == "L":
transparency = max(0, min(65535, im.encoderinfo["transparency"]))
chunk(fp, b"tRNS", o16(transparency))