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Retain RGBA transparency when saving multiple frames

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This commit is contained in:
Andrew Murray 2022-03-12 15:14:36 +11:00
parent 475b7233d6
commit 4e16a9a942
2 changed files with 29 additions and 19 deletions
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11
Tests/test_file_gif.py
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@ -842,6 +842,17 @@ def test_rgb_transparency(tmp_path):
assert "transparency" not in reloaded.info
def test_rgba_transparency(tmp_path):
out = str(tmp_path / "temp.gif")
im = hopper("P")
im.save(out, save_all=True, append_images=[Image.new("RGBA", im.size)])
with Image.open(out) as reloaded:
reloaded.seek(1)
assert_image_equal(hopper("P").convert("RGB"), reloaded)
def test_bbox(tmp_path):
out = str(tmp_path / "temp.gif")

15
src/PIL/GifImagePlugin.py
View File

@ -424,7 +424,7 @@ class GifImageFile(ImageFile.ImageFile):
RAWMODE = {"1": "L", "L": "L", "P": "P"}
def _normalize_mode(im, initial_call=False):
def _normalize_mode(im):
"""
Takes an image (or frame), returns an image in a mode that is appropriate
for saving in a Gif.
@ -437,14 +437,12 @@ def _normalize_mode(im, initial_call=False):
get returned in the RAWMODE clause.
:param im: Image object
:param initial_call: Default false, set to true for a single frame.
:returns: Image object
"""
if im.mode in RAWMODE:
im.load()
return im
if Image.getmodebase(im.mode) == "RGB":
if initial_call:
palette_size = 256
if im.palette:
palette_size = len(im.palette.getdata()[1]) // 3
@ -455,8 +453,6 @@ def _normalize_mode(im, initial_call=False):
im.info["transparency"] = im.palette.colors[rgba]
break
return im
else:
return im.convert("P")
return im.convert("L")
@ -514,7 +510,7 @@ def _normalize_palette(im, palette, info):
def _write_single_frame(im, fp, palette):
im_out = _normalize_mode(im, True)
im_out = _normalize_mode(im)
for k, v in im_out.info.items():
im.encoderinfo.setdefault(k, v)
im_out = _normalize_palette(im_out, palette, im.encoderinfo)
@ -646,11 +642,14 @@ def get_interlace(im):
def _write_local_header(fp, im, offset, flags):
transparent_color_exists = False
try:
if "transparency" in im.encoderinfo:
transparency = im.encoderinfo["transparency"]
except KeyError:
else:
transparency = im.info["transparency"]
transparency = int(transparency)
except (KeyError, ValueError):
pass
else:
transparency = int(transparency)
# optimize the block away if transparent color is not used
transparent_color_exists = True