convert multiple images, reduce transparency

convert_images.bash

convert 1.jpg -alpha set -background none -channel A -evaluate multiply 0.5 +channel 1.png

Using ImageMagick to do the convert, to make an image have 50% transparency (less ink during printing). https://imagemagick.org/index.php

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for i in *.jpg; do echo $i; done

Looping through files


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for i in *.jpg; do convert $i "${i%.jpg}.png"; done

test run to convert images from jpg to png. 

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for i in *.jpg; do convert $i -alpha set -background none -channel A -evaluate multiply 0.5 +channel "${i%.jpg}.png"; done

convert with transparency


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More resources:

https://linuxize.com/post/bash-for-loop/

https://legacy.imagemagick.org/discourse-server/viewtopic.php?t=31549