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Kovid Goyal 2016-05-06 21:37:50 +05:30
parent 6115eb9330
commit 00c5680799
1 changed files with 9 additions and 4 deletions
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13
src/calibre/utils/img.py
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@ -84,10 +84,15 @@ def blend_image(img, bgcolor='#ffffff'):
overlay(img, nimg) overlay(img, nimg)
return nimg return nimg
def image_to_data(img, compression_quality=95, fmt='JPEG', png_compression_level=9, jpeg_optimized=True, jpeg_progressive=True): def image_to_data(img, compression_quality=95, fmt='JPEG', png_compression_level=9, jpeg_optimized=True, jpeg_progressive=False):
''' Serialize image to bytestring in the specified format. '''
compression_quality is for JPEG and goes from 0 to 100. Serialize image to bytestring in the specified format.
png_compression_level is for PNG and goes from 0-9 '''
:param compression_quality: is for JPEG and goes from 0 to 100. 100 being lowest compression, highest image quality
:param png_compression_level: is for PNG and goes from 0-9. 9 being highest compression.
: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
'''
ba = QByteArray() ba = QByteArray()
buf = QBuffer(ba) buf = QBuffer(ba)
buf.open(QBuffer.WriteOnly) buf.open(QBuffer.WriteOnly)