Imagemagick: remove alpha component (replace all intermediate alpha pixel with solid pixel)

Question

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 o

Answer 1

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.

Answer 2

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