By default, GIMP comes with one ICC (International Color Consortium) profile preloaded and that is sRGB. While this color space works well for images you wish to view on a screen, its color gamut (range of colors) is more lacking than, say, Adobe 1998 or Pro Photo. As a simple means of diagramming this, the image at left, from the Adobe whitepaper A Color Managed Raw Workflow by Jeff Schewe and Bruce Fraser, shows how each gamut can reproduce only a certain segment of the total visible color spectrum.
Using a gamut that allows for a larger color representation allows for more accurate colors when printing. And while the full range of the Pro Photo RGB gamut can’t be faithfully reproduced on most consumer monitors today, using a larger gamut does aid in more accurate color printing. It’s not necessary to use the Pro Photo RGB gamut for all your editing, Adobe 1998 RGB does a pretty good job. But that’s not the focus of this post. This article is about showing you how to use any ICC profile you’d like in GIMP and then the choice can be yours. (i.e. Please don’t start another “Gamut War!” in the comments section 🙂 )
The ICC Profile for Adobe 1998 RGB, used in this example, can be found here on Adobe’s site (Windows, Mac and Linux versions). Download your appropriate file and copy the file named AdobeRGB1998.icc to a handy location on your system. For this example, I created a folder on my desktop called icc to use as an example. WARNING! GIMP really doesn’t like it if you move this file after the initial load, so be happy with where you put it. While these instructions are based on use of a PC, the general steps are the same for Mac or Unix based systems.