How to change quality of output image with Flameshot capture to PNG by script?

tux_tina

Recently switched to wayland and started to use Flameshot from a script to take screenshots. Was using the mighty scrot under X11 but it only gives black images under wayland, hence the switch. ~/scripts/flameshot.sh called with Print screen key #!/bin/bash flameshot full --raw > "$HOME/Pictures/flameshots/$(date '+%l:%M:%S%P %a %b %d.%m.%Y').png" I wrote the script to make screen-shotting a one key solution instead of using the GUI, nothing...

Originally asked by rustyshark on Stack Exchange (superuser) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

--raw writes a PNG-encoded stream to standard output. The > in your script only chooses where those bytes go: changing the filename to .jpg would still leave you with PNG data. To save JPEG with a chosen quality, pipe that stream through ImageMagick 7: #!/bin/bash set -o pipefail dir="$HOME/Pictures/flameshots" mkdir -p "$dir" || exit 1 file="$dir/$(date '+%Y-%m-%d_%H-%M-%S').jpg" flameshot full --raw | magick png:- -background white -alpha remove -alpha off -quality 85 "$file" png:- tells ImageMagick to read PNG from stdin; the output filename selects JPEG. 85 is an example JPEG quality setting, not a percentage of the original image quality. The background/alpha options give any...

Full answer by Андрей: https://superuser.stackexchange.com/a/1941311 (CC BY-SA 4.0).

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