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fix Issue #312

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improve palette handling while saving gif and png
This commit is contained in:
David Schmidt 2013-08-02 16:32:49 +02:00
parent dcb6eef590
commit b9ab3f5bf4
2 changed files with 18 additions and 18 deletions
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11
PIL/GifImagePlugin.py
View File

@ -54,7 +54,6 @@ class GifImageFile(ImageFile.ImageFile):
format = "GIF"
format_description = "Compuserve GIF"
global_palette = None
def data(self):
@ -71,13 +70,9 @@ class GifImageFile(ImageFile.ImageFile):
raise SyntaxError("not a GIF file")
self.info["version"] = s[:6]
self.size = i16(s[6:]), i16(s[8:])
self.tile = []
flags = i8(s[10])
bits = (flags & 7) + 1
if flags & 128:
@ -122,7 +117,8 @@ class GifImageFile(ImageFile.ImageFile):
self.im = self.dispose
self.dispose = None
self.palette = self.global_palette
from copy import copy
self.palette = copy(self.global_palette)
while True:
@ -252,6 +248,9 @@ def _save(im, fp, filename):
palette = im.encoderinfo["palette"]
except KeyError:
palette = None
if im.palette:
# use existing if possible
palette = im.palette.getdata()[1]
header, usedPaletteColors = getheader(imOut, palette, im.encoderinfo)
for s in header:

25
PIL/PngImagePlugin.py
View File

@ -489,26 +489,24 @@ def _save(im, fp, filename, chunk=putchunk, check=0):
#
# attempt to minimize storage requirements for palette images
if "bits" in im.encoderinfo:
# number of bits specified by user
n = 1 << im.encoderinfo["bits"]
colors = 1 << im.encoderinfo["bits"]
else:
# check palette contents
n = 256 # FIXME
if im.palette:
colors = len(im.palette.getdata()[1])//3
else:
colors = 256
if n <= 2:
if colors <= 2:
bits = 1
elif n <= 4:
elif colors <= 4:
bits = 2
elif n <= 16:
elif colors <= 16:
bits = 4
else:
bits = 8
if bits != 8:
mode = "%s;%d" % (mode, bits)
@ -545,8 +543,11 @@ def _save(im, fp, filename, chunk=putchunk, check=0):
b'\0') # 12: interlace flag
if im.mode == "P":
palette_bytes = (2 ** bits) * 3
chunk(fp, b"PLTE", im.im.getpalette("RGB")[:palette_bytes])
palette_byte_number = (2 ** bits) * 3
palette_bytes = im.im.getpalette("RGB")[:palette_byte_number]
while len(palette_bytes) < palette_byte_number:
palette_bytes += b'\0'
chunk(fp, b"PLTE", palette_bytes)
if "transparency" in im.encoderinfo:
if im.mode == "P":