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I've been using GIMP for years, but am hardly its master.
I am trying to use this photo:
As you can see, it has a number of shades of grey as well as black. I have a particular color that I'd like to replace the black letters with and then the greys with the same color but changed to be that same value.
Is there a way to make GIMP do this for me?
Another solution is to create a gradient and use Color>Map>Gradient map. In the simplest cases, just make the foreground color the darkest color you need, keet the BG color white, and use the FG->BG gradient. With FG=#00006f:
Figured it out. I selected the layer with the image and clicked on Colors->Colorize... I add the HSV values for my color and BAM! it changed it like magic. Was pretty cool.
Colorize works in the HSL model, it mostly changes Hue/Saturation, and so has little to none effect on very dark or very light pixels.