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Fix sending PNGs without alpha channel, edit size typo

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Lonami Exo 2019-02-19 17:48:27 +01:00
parent 6db60627e6
commit 96270bdc18
1 changed files with 13 additions and 7 deletions
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10
telethon/client/uploads.py
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@ -31,7 +31,7 @@ class _CacheType:
def _resize_photo_if_needed( def _resize_photo_if_needed(
file, is_image, width=64, height=64, background=(255, 255, 255)): file, is_image, width=1280, height=1280, background=(255, 255, 255)):
# https://github.com/telegramdesktop/tdesktop/blob/12905f0dcb9d513378e7db11989455a1b764ef75/Telegram/SourceFiles/boxes/photo_crop_box.cpp#L254 # https://github.com/telegramdesktop/tdesktop/blob/12905f0dcb9d513378e7db11989455a1b764ef75/Telegram/SourceFiles/boxes/photo_crop_box.cpp#L254
if (not is_image if (not is_image
@ -50,12 +50,18 @@ def _resize_photo_if_needed(
image.thumbnail((width, height), PIL.Image.ANTIALIAS) image.thumbnail((width, height), PIL.Image.ANTIALIAS)
alpha_index = image.mode.find('A')
if alpha_index == -1:
# If the image mode doesn't have alpha
# channel then don't bother masking it away.
result = image
else:
# We could save the resized image with the original format, but # We could save the resized image with the original format, but
# JPEG often compresses better -> smaller size -> faster upload # JPEG often compresses better -> smaller size -> faster upload
# We need to mask away the alpha channel ([3]), since otherwise # We need to mask away the alpha channel ([3]), since otherwise
# IOError is raised when trying to save alpha channels in JPEG. # IOError is raised when trying to save alpha channels in JPEG.
result = PIL.Image.new('RGB', image.size, background) result = PIL.Image.new('RGB', image.size, background)
result.paste(image, mask=image.split()[3]) result.paste(image, mask=image.split()[alpha_index])
buffer = io.BytesIO() buffer = io.BytesIO()
result.save(buffer, 'JPEG') result.save(buffer, 'JPEG')