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epicyon
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Code Issues 14 Releases Wiki Activity

Improve dithering

main
bashrc 2026-07-26 11:52:55 +01:00
parent 0f92154be0
commit 80ce1af995
1 changed files with 20 additions and 5 deletions
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25
src/media.py
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@ -482,17 +482,32 @@ def get_music_metadata(filename: str) -> {}:
def convert_image_to_low_bandwidth(image_filename: str) -> None: def convert_image_to_low_bandwidth(image_filename: str) -> None:
"""Converts an image to a low bandwidth version """Converts an image to a low bandwidth version
""" """
low_bandwidth_filename = image_filename + '.low' low_bandwidth_filename = safe_system_string(image_filename + '.low')
if is_a_file(low_bandwidth_filename): if is_a_file(low_bandwidth_filename):
erase_file(low_bandwidth_filename, erase_file(low_bandwidth_filename,
'EX: convert_image_to_low_bandwidth unable to delete ' + 'EX: convert_image_to_low_bandwidth unable to delete ' +
low_bandwidth_filename) low_bandwidth_filename)
# cmd = \
# '/usr/bin/convert +noise Multiplicative ' + \
# '-evaluate median 10% -dither Floyd-Steinberg ' + \
# '-monochrome ' + safe_system_string(image_filename) + \
# ' ' + low_bandwidth_filename
cmd = \ cmd = \
'/usr/bin/convert +noise Multiplicative ' + \ "convert \"" + safe_system_string(image_filename) + "\" " + \
'-evaluate median 10% -dither Floyd-Steinberg ' + \ "-resize 800 -set option:distort:viewport '%wx%h+0+0' " + \
'-monochrome ' + safe_system_string(image_filename) + \ '-colorspace CMYK -separate null: \\( -size 2x2 xc: ' + \
' ' + safe_system_string(low_bandwidth_filename) '\\( +clone -negate \\) +append \\( +clone -negate \\) ' + \
'-append \\) -virtual-pixel tile -filter gaussian ' + \
'\\( +clone -distort SRT 2,0 \\) ' + \
'+swap \\( +clone -distort SRT 2,15 \\) ' + \
'+swap \\( +clone -distort SRT 2,45 \\) ' + \
'+swap \\( +clone -distort SRT 2,75 \\) ' + \
'+swap +delete -compose Overlay -layers composite ' + \
'-colors 2 -set colorspace CMYK -combine "' + \
low_bandwidth_filename + '"'
print('Low bandwidth image conversion: ' + cmd) print('Low bandwidth image conversion: ' + cmd)
subprocess.call(cmd, shell=True) subprocess.call(cmd, shell=True)
# wait for conversion to happen # wait for conversion to happen