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I have a folder of images over 4MB - let's call this folder dsc_big/. I'd like to use convert -define jpeg:extent=2MB to convert them to under 2MB and copy dsc_big/* to a folder dsc_small/ that already exists.
I tried convert dsc_big/* -define jpeg:extent=2MB dsc_small/ but that produces images called -0, -1, and so on.
What do I do?
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To resize an image to specific dimensions, use the convert command with an input file, the -resize parameter, your preferred dimensions, and an output filename: convert original. png -resize 100x100 new.
Select a group of images with your mouse, then right-click them. In the menu that pops up, select “Resize pictures.” An Image Resizer window will open. Choose the image size that you want from the list (or enter a custom size), select the options that you want, and then click “Resize.”
convert is designed to handle a single input file as far as I can tell, although I have to admit I don't understand the output you're getting. mogrify is better suited for batch processing in the following style:
mogrify -path ../dsc_small -define jpeg:extent=2MB dsc_big/* But honestly I consider it dangerous for general usage (it'll overwrite the original images if you forget that -path) so I always use convert coupled with a for loop for this:
for file in dsc_big/*; do convert $file -define jpeg:extent=2MB dsc_small/`basename $file`; done The basename call isn't necessary if you're processing files in the current directory.
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