Converting Non-standard Filename Extensions

Before I even get to ImageMagick, I need to address something that’s a bit of a bugaboo with me. It’s that Linux and Unix operating systems are all case-sensitive, while other operating systems aren’t. So on Linux and Unix, somegraphic.png and somegraphic.PNG are two different files, while on Windows they both represent the same file. On Linux and Unix, it’s more proper to use lower-case letters in filename extensions. If you’re running a desktop implementation of either Linux or Unix, you might find that your GUI file manager won’t automatically open your graphics files in the graphics file viewer if the filename extensions for those files consist of upper-case letters. This wouldn’t be that big of a problem, except for the fact that certain Windows utilities and certain digital cameras always create graphics files with all upper-case letters in their filenames. Also, if you create a script...