With existing
scale2x plugin for GIMP. And with a post on
fast pixel operation. I have combine them and make a faster scale2x GIMP plugin, and I also create a scale3x plugin by using scale2x website as a reference.
Here are the plugins...
-
Scale2x GIMP Plugin-
Scale3x GIMP PluginTo install the plugins, you need to drop the files into GIMP plugin folder, and make the dropped file executable (chmod +x filename). Once installed, the command can be found at the menu "Image > Scale using Scale2x" and "Image > Scale using Scale3x" respectively.
http://scale2x.sourceforge.net/