Square thumbnails with ImageMagick (convert)?

Question

How to create square/cropped thumbnail using ImageMagick ? Cropping like below.

cropping

Ignacio Vazquez-Abrams · Answer 1 · 2011-04-26 08:33:00Z

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answered Apr 26 '11 at 8:33

1

Possibly... some type of description? – Hello71 Apr 27 '11 at 2:22

feedback

pconcepcion · Answer 2 · 2011-04-26 08:28:26Z

up vote 0 down vote

I think you are looking for something like:

convert -crop 100x100+50+50 input_image.jpg output_image.jpg

where 100x100 is the size of the final rectangle and 50x50 the offset.

answered Apr 26 '11 at 8:28

	That crop image, but doesn't make thumbnail. – marioosh Apr 26 '11 at 11:11
	@marioosh: I didn't understood, you can use `convert -thumbnail 100x100+50+50 input_image.jpg output_image.jpg`, for more info check Igancio Vazquez response for an example or check the documentation – pconcepcion Apr 26 '11 at 11:15

feedback

Jonah Braun · Answer 3 · 2011-12-15 00:02:03Z

Ignacio linked to the correct documentation, however I'll paste it inline here for convenience:

convert -define jpeg:size=200x200 original.jpeg -thumbnail 100x100^ -gravity center -extent 100x100 thumbnail.jpeg

Similarly, the following is for GraphicsMagick:

gm convert -size 200x200 original.jpeg -thumbnail 100x100^ -gravity center -extent 100x100 +profile "*" thumbnail.jpeg

Explanation:

-size 200x200 tells the jpeg decoder we only need this resolution so it can save memory and read the source image faster
-thumbnail 100x100^ fast resize making the shortest side 100
- gravity center center the next operation
-extent 100x100 apply the image to a 100x100 canvas
+profile "*" do not save any metainfo to the jpeg (making the resulting image smaller)

When I used it in command line (graphics magick one) I got picture on center, two siders are filled with white. Not the one described in question. Am I doing something wrong?

3 Answers