On Friday, 18 September 2020 14:58:59 BST tastytea wrote: > On 2020-09-18 13:32+0000 Alan Mackenzie <a...@muc.de> wrote: > > Hello, Gentoo! > > > > I've a number of jpeg files, 17 to be precise, which are high > > resolution and are around 3½ megabytes each. I would like to > > compress them down to around 100 kb each. > > > > I'm sure this is possible, if tedious, in gimp, somehow, but I can't > > for the life of me work out how (since it's years since I last did > > this). > > > > What is the best way (minimal learning, scriptable if possible), to do > > this? > > I'm not aware of a way that allows you to specify a file size, but you > can use convert from media-gfx/imagemagick to re-compress and/or resize > the files. For example: > > convert -quality 50 in.jpg out.jpg > convert -resize 1000 in.jpg out.jpg > > The last command makes the image 1000px wide and sets the height > automatically to the right value. > > Hope this helps, > tastytea
I would also recommend convert, which can be scripted to run in a directory
and compress all jpeg files therein to a lower resolution. Something like
this ought to do the job:
#!/bin/bash
for i in *.jpg; do
name=${i%.jpg}
convert -compress JPEG -quality 95 ${i} ${name}_compressed.jpg
done
You'll need to adjust the -quality parameter to your liking.
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