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fixit7
Asked: 2023-04-25 05:26:58 +0800 CST

How can I batch convert some .jpgs to .pngs

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I would like to convert some .jpgs to a 640x480 size.

I looked through my Ubuntu_Tips.odt file and found this.

Convert png to a 640x480 png.
 convert Screenshot_1360x768.png -resize 640x480! 640smaller.png

I have 8 of those files in /home/andy/Downloads/.

Is there a way to do a batch convert of those .jpgs files to the smaller file size?

Thanks.

ubuntu-mate

1 Answers

  1. Best Answer

    Repeat your command 8 times? It is probably the better method as you might need to change your command on the current proportions of those files. A command that repeats convert without taking that in consideration will not get the expected result.

    Instead of convert there is also mogrify. It does not require a 2nd filename so this will convert all pngs to 640x480. You can narrow it down by altering the wildcard:

    mogrify -resize 640x480 *.png

    (this will overwrite the existing file(s))

    If you need to alter proportions you need to add an escaped !:

    convert -resize 640x480\! {file_old}.png {file_new}.png

    (this will result in a new file)

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