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Doug,
All of my graphics programs are older (I don't upgrade very often), so I work in pixels. This is also the underlying base of all raster graphics. Since GIMP allows you to work in inches, it must also have a setting for resolution. Make sure that is set appropriately for what you want to do. You might also consider switching to mm (or cm) as that will save you having to do conversions.
If we all had calibrated monitors, the colors that we would see would be nearly the same on every computer. In reality they vary from one computer to another. This is not quite as bad as it sounds. If your "lozenge" pattern matches the colors of an internet source on your computer, it should match the same source on my computer, even though we don't see the same thing.
The problem comes when you print it. The printed colors will be different than the colors on your monitor, because monitors work on additive light and pigments work of subtractive light. If your monitor is calibrated and Gimp compensates for color spaces, it offset this some.
That said, you can't do any worse than some of the commercial "lozenge" decals that have been produced.
Steve
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