[Solved] Using ImageTrim with a Disk for Masking

Questions
1

I’m trying to crop the image below using a disk-shaped mask. ImageTrim documentation suggests that using a Disk object for masking is supported. However, when I use the following, it trims the image in a square rather than a disk:

ImageTrim[image, Disk[{375, 375}, 300]]

I appreciate any suggestions on how to crop the image to a circle.

image.jpeg
image.jpeg750×750 17.2 KB

2

Hi John,

Images are always rectangular. Perhaps what you want is to replace the dark areas around the disk with an alpha channel that will make it transparent. You can use RemoveBackground to do that. Using the image provided

RemoveBackground[img, {Black, .01}]

4001plot.jpg
4001plot.jpg938×938 54.9 KB

3

Thanks so much! This is exactly what I was trying to accomplish.
John

4

I, too, was looking for a solution. Thanks a lot!

José