jpeg_modes.txt

# JPEG modes
###
# Other modes:
# Default quality (75)
im.save(f"{folder_destination}/3-default.jpg")

# Default quality optimized
# Enabling the setting in Pillow responsible for additional file size savings at the cost of CPU time (optimize=True). Due to the nature of the tradeoff being made, this does not impact image quality at all.
save_args = {}
save_args['optimize'] = True
save_args['exif'] = exif_bytes
im.save(f"{folder_destination}/3-default-optimize.jpg", **save_args)

# Default quality progressive (changes how images are loaded and it can reduce a little bit the file size)
# This mode increases the number of 0s that might be in a row of pixels (which can be more easily compressed).
save_args = {}
save_args['progressive'] = True
save_args['exif'] = exif_bytes
im.save(f"{folder_destination}/3-default-progressive.jpg", **save_args)

# Default quality optimize + progressive
save_args = {}
save_args['optimize'] = True
save_args['progressive'] = True
save_args['exif'] = exif_bytes
im.save(f"{folder_destination}/3-default-optimize-progressive.jpg", **save_args)

# Quality that is most of the times the best
save_args = {}
save_args['quality'] = 85
save_args['exif'] = exif_bytes
im.save(f"{folder_destination}/3-quality-85.jpg", **save_args)

# Worst quality
save_args = {}
save_args['quality'] = 1
save_args['exif'] = exif_bytes
im.save(f"{folder_destination}/3-quality-1.jpg", **save_args)

# Quality is calculated dinamically to know what it is the best to use without affecting so much
# to the original quality
save_args = {}
(quality, ssim) = jpeg_dynamic_quality(im)
save_args['quality'] = quality
save_args['optimize'] = True
save_args['exif'] = exif_bytes
im.save(f"{folder_destination}/3-quality-optimize-dynamic.jpg", **save_args)