Here, we have turned day into night, or is it the other way around? As you can see, our yellow truck has turned blue without any change in the other colors in the image. It's also a great tool for changing colors. Hue-Saturation is perhaps an even better tool for correcting color problems. With the Posterize command you can reduce the number of colors/shades in an image, making it less naturalistic.Ĭolor balance is a useful color correction tool if your image has distorted colors, or if you want to change the colors, like we have done with the blue duck. This means that if you have a slide scanner, scan the negative film and "develop" it to positive images using the Invert command. Invert will make a color image look like a photo negative. The Equalize command can be used enhance contrast and to find "hidden" colors in old, fading photos. The Image menu commands execute most operations in either RGB or HSV color space. Finally, you can perceive more colors with your eyes than a monitor can display. An RGB monitor can display many more colors than a printer (CMYK) can. It is essential to understand that different color models/devices have different gamut areas. If you want to learn to use an image manipulation program like Gimp to its full capacity, you must learn how colors work in the digital world and to understand the different color Color Models and Pre-press chapters. The Gradient Editor allows you to create your own gradients where you'll have absolute control over all parameters, so this is a very useful tool for advanced image manipulation. You can use gradients to blend two images through layer masks, or as a distort map image. The Gradient Editor is the key to making smooth color transitions, and it is used as a base for many kinds of important operations in Gimp. Choosing colors from the color dialog is much too ineffective, and you can't be that sure that you get the same color each time. Think of it like the palette that you use for making ordinary paintings. When it comes to color tools, the color palette is among the more useful.
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