Mike Rankin demonstrates the Colorize and Color Balance commands in GIMP. Color Balance lets you shift colors towards red, green, blue, cyan, magenta, or yellow and target those shifts to shadows midtones or highlights. Colorize lets you apply totally new values of hue, saturation, and lightness. Both commands can be used with layers and masks to limit their effect.
- [Instructor] In this chapter, we'll look at how to make adjustments to photographs in GIMP. We'll see how to work with color, brightness and detail as well as how to remove image damage and unwanted elements from photos. And we'll begin by looking at how to use the color balance and colorize commands. In the first exercise file for this movie, we have a photograph of some fruit. And it's a pretty nice photo, but those blueberries are a little more purple than blue. And the strawberries are really saturated red. So, let's say we wanted to address that and also try to add some contrast in the kiwis.
Since most of what we want to do is in the darkest part of the image, we might be able to use color balance for that. I'll open color balance by choosing colors, color balance. Notice I can target the shadows, midtones, or highlights. And for each of those three areas, I can adjust colors with these three sliders. I can shift the balance between opposite colors, like cyan, and red, magenta, and green, and yellow, and blue.
And at any time I can reset all three sliders by clicking this button. So, in this photo I could take magenta out of the shadows by dragging the slider towards green. And with preview selected, I can see the result right away. I'll toggle that on and off so we can see the before and after. So those blueberries are definitely looking more blue and now they also have some more contrast. Then, to add some contrast to the kiwis and the strawberries, which are looking a little flat, I can drag the yellow/blue slider towards blue.
And we can toggle on preview to see before and after again. And there's definitely more contrast in the kiwis now. And the blueberries weren't affected very much by this slider, because they already had plenty of blue in the shadows. And because we're targeting the shadows, the light frosting area in between the pieces of fruit was unaffected. If I have a set of adjustments that I want to apply to multiple images, I can save those settings as a preset by clicking the plus button near the preset menu at the top of the dialogue box.
I'll just call this Fruit. And then if I reset, I can bring back those settings at any time by choosing my preset. To delete a preset, click the triangle to the right of the preset menu and choose manage presets. Select the one you don't want anymore, and click the delete button. So that's color balance. Colorize, as its name suggests, is good for completely changing the colors in an image, and you can use it to make lots of interesting looks, including duotone and monotone effects.
So if I switch to our other exercise file, I can create some of those effects with this image of the car by choosing colors, colorize, and immediately you see the effect, because the preview button is checked here. In this dialogue box, we have sliders for hue, saturation, and lightness. Hue starts out at cyan, in the middle, and it goes to green, yellow, and red on the left side, and on the right side it goes to blue, and then purple, magenta, and then back to red.
The saturation slider can make images go from pure saturated colors all the way down to gray. And lightness goes all the way from pure white to black, to any shade in between. So, for example, to create a monotone effect, I could drag the lightness to the right and then choose a hue, maybe somewhere around 50 for the lightness, and a hue around 40, create a sepia toned effect, or I could create an entirely different duotone effect with different values.
I'll use a hue of 280, and a lightness of minus 10 to create this dark purple/black effect. So with color balance and colorize, you can make all kinds of adjustments to a photo. From subtle improvements, to contrast, to wholesale replacements in color throughout an image.
- Navigating the GIMP interface
- Creating and saving documents
- Working with selections
- Using Quick Masks
- Adjusting images with Curves and Levels
- Working with text and paths
- Working with colors and brushes
- Configuring brush keyboard shortcuts
- Enhancing photos with filters
- Outputting images