To solve Android build issue I need to replace all intermediate alpha pixel with solid pixel (leaving transparent background as is).
How to that with ImageMagick or other-command line tool to all images in a tree?
Image bg_all_block.9.png
Image btn_bg_common_press.9.png
UPDATE: I have found that I can detect if alpha is used, as in Detect Alpha Channel with ImageMagick
Other found links
To remove the alpha channel from single image use this command:
convert input.png -alpha off output.png
To remove the alpha channel from all images inside a folder, make use find
to first find all PNG files, and then run 'm through convert
:
find . -name "*.png" -exec convert "{}" -alpha off "{}" \;
Please test on a COPY of your files to be sure.
...
see dialog below, and the answer is based on that "we need to remove alpha that is not 255"
convert input.png -channel A -threshold 254 output.png
and for batch
mkdir batch
FOR %G IN (*.png) DO convert %G -channel A -threshold 254 batch\%G
What worked for me on macOS for batch processing was:
for f in *.png; do convert "$f" -channel A -threshold 254 "${f%%.png}.png"; done
To remove alpha channel from all pictures in the folder (f.ex. all .png files) I use following command (in terminal on macOS):
for file in *.png; do convert $file -alpha deactivate; done
Unfortunately, none of any other solution given in this thread worked for me.
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