You can sharpen an image in GIMP on your computer using the Sharpen tool or the Sharpen filter. Here is a full tutorial on how to do it!

Using GIMP, you can crop an image. rotate or flip a photo, Change dimension & scale of a picture, change the file size of a JPEG photo, etc.

I needed to remove the white background from several hundred images in PNG format and replace it with transparency. I know you can automate Photoshop but that’s like getting into a Sherman tank ...