Question

13

ImageMagick convert on a multiple files

rated 0 times [ 13] [ 0] / answers: 1 / hits: 9811 / 2 Years ago, mon, september 5, 2022, 12:56:28

I have 3 files in a directory:

aaa.jpg    

bbb.jpg  

ccc.jpg

I can scale down an image using ImagkMagick convert:

convert aaa.jpg -resize 1200x900 aaa-small.jpg

I want to do all the images in the directory, something like:

convert *.jpg -resize 1200x900 *-small.jpg

but this results in files named like so:

*-small-0.jpg  

*-small-1.jpg  

*-small-2.jpg

What I want is:

aaa-small.jpg  

bbb-small.jpg  

ccc-small.jpg

How do I do this?

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oreera

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answered 2 Years ago stantildlike · Accepted Answer

It's frustratingly opaque in the documentation, but you can pass a quoted shell glob to convert (quoted to prevent the shell from expanding it prematurely), and use Filename Percent Escapes to construct output filenames in the form %[filename:label] (where label is an arbitrary user-specified label), using the input basename escape %[basename] or its legacy equivalent %t:

$ ls ???.jpg

aaa.jpg  bbb.jpg  ccc.jpg

then

$ convert '*.jpg' -set filename:fn '%[basename]-small' -resize 1200x900 '%[filename:fn].jpg'

resulting in

$ ls ???-small.jpg

aaa-small.jpg  bbb-small.jpg  ccc-small.jpg