ImageMagick's neat, but the steps required to warp and then tenderly shadow and sheen the output of a grab are, in my experience, much better done (initially at

ImageMagick's neat, but the steps required to warp and then tenderly shadow and sheen the output of a grab are, in my experience, much better done (initially at least) with a GUI tool. A lot quicker to intuit, test and iterate. I hate the thing personally[1], but GIMP would likely be a better graphic manipulation suggestion, in this context. Of course, once you've worked out what you're after, and want to manipulate tens or thousands of images, ImageMagick's your wizard. . [1] I'd just download a trial of AffinityPhoto and use that