By Joel Dare - Written February 15, 2022
Some instructions on how to round the corners of an image to make it a little softer. If you’re showing the image in HTML you can apply a CSS effect like border-radius, but this modifies the original image.
First, create a mask that’s the same size of the image using the command below. Notice that the roundrectangle command is zero based so the size is one pixel smaller than the image size.
convert -size 664x104 xc:none -draw "roundrectangle 0,0,663,103,10,10" mask.png
Now use that image as a mask on the original image to create the new rounded image.
convert original.png -matte mask.png -compose DstIn -composite rounded.png
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