Tutorial Gimp: How to replace a color

 

Howto change a color in gimp


Hi all, in this small tutorial i want to show you, how you can replace a color in Gimp.
There are several ways to change a color . It depends on the range of the color-value.
if you want to replace exact one color (for example white (FFFFFF) it is more easy, than replacing a range of colors (for example, a sky – which has more values of blue). At the end of this how to you find the whole tutorial as youtube-video.

 

Requirements:

Linux (tutorial made with Ubuntu) / Windows
gimp

Solution:

1.) Replace exact one color
2.) Replace similar colors

1.) Replace exact one color:

In the following example image we have 2 colors:
color1 : blue   (Hex: 0000ff).
color2:  green (Hex: 30ec72).

gimp-replace-color-eg-image

 

 

click to enlarge

Now we want to replace blue by red. Therefore please open the “Color Exchange” menu like shown on the screenshot below:

gimp-replace-color-exchangeclick to enlarge

In the “From Color” Dialog insert the color that you want to replace. In our case it is blue.In the “To Color” dialog please insert the color you want to change in. For example red.

gimp-replace-color-change-colorclick to enlarge

As you can see,  our blue area is red now.

2.) Replace similar colors:

In the second example we want to change the color of the following shack:

gimp-replace-color-shack-origclick to enlarge

The shack has blue and variants of blue, so we cant use the same method like in example1.

First we select this small house.

gimp-replace-color-shack-selectclick to enlarge

As you can see, you don’t have to select to exactly. It is sufficient if you use the rectangle-select-tool. You only has to be sure, that there are none other blue objects in this selection.

Now we open the Rotate-Colors Dialog

gimp-replace-colors-rotate-colorsclick to enlarge

In this dialog, set the upper arrows that they are match all variants of blue.
The lower arrows are set to the color you want to paint the shack.

For example from blue to red:

gimp-replace-colors-set-rotateclick to enlarge

or from blue to green:

gimp-replace-colors-greenclick to enlarge

After applying the Dialog you have change the color of your shack.

gimp-replace-colors-resultclick to enlarge

Here the whole “gimp-replace-color” – tutorial as youtube-video in HD

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