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Implement saving of images as GIF

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This commit is contained in:
Kovid Goyal 2016-06-18 11:37:46 +05:30
parent 244dc86a68
commit 07e1840afa
1 changed files with 13 additions and 1 deletions
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14
src/calibre/utils/img.py
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@ -5,6 +5,7 @@
from __future__ import (unicode_literals, division, absolute_import,
print_function)
import os, subprocess, errno, shutil, tempfile, sys
from io import BytesIO
from threading import Thread
from PyQt5.Qt import QImage, QByteArray, QBuffer, Qt, QImageReader, QColor, QImageWriter, QTransform
@ -94,10 +95,20 @@ def image_to_data(img, compression_quality=95, fmt='JPEG', png_compression_level
:param jpeg_optimized: Turns on the 'optimize' option for libjpeg which losslessly reduce file size
:param jpeg_progressive: Turns on the 'progressive scan' option for libjpeg which allows JPEG images to be downloaded in streaming fashion
'''
fmt = fmt.upper()
ba = QByteArray()
buf = QBuffer(ba)
buf.open(QBuffer.WriteOnly)
fmt = fmt.upper()
if fmt == 'GIF':
w = QImageWriter(buf, b'PNG')
w.setQuality(90)
if not w.write(img):
raise ValueError('Failed to export image as ' + fmt + ' with error: ' + w.errorString())
from PIL import Image
im = Image.open(BytesIO(ba.data()))
buf = BytesIO()
im.save(buf, 'gif')
return buf.getvalue()
is_jpeg = fmt in ('JPG', 'JPEG')
w = QImageWriter(buf, fmt.encode('ascii'))
if is_jpeg:
@ -488,6 +499,7 @@ def test(): # {{{
gaussian_blur_image(img)
despeckle_image(img)
remove_borders_from_image(img)
image_to_data(img, fmt='GIF')
# }}}
if __name__ == '__main__': # {{{