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The Color Replacement tool

The Color Replacement tool lets you replace colors of an image by others. To do this we select in the tool pane and modify its options to act according to our needs.

Once selected the brush tip with which we work we set the other options for the tool to work properly.

Normally our intention is to change the color of the image, you may also change the Brightness, Saturation and Hue of the image using this tool. Select the appropriate option for each of these actions the drop-down mode.

The three buttons shown below correspond to how the sample will be taken to replace the color in the image.

The tip of this tool has a special way. It consists of a rounded base (like a normal brush) but adds a cross-shaped peephole in its center. The loop option evaluates each pixel of color that passes through the blade pointer and replaced each time the color evaluation.

If escogiésemos Once the sampled color would be the first on which we click, and replace only that color in the image.

also
possible to define a background color (in the Tools panel) and use it as a sign to replace that color in the image by selecting the option Sample of funds.

Limits option accepts 3 values. Sets limits on the manner in which the colors are replaced. Adjacent find
as default, replacing the color areas sampled by the cross but only if they are connected.

option does the opposite not adjacent, connected or not, supersedes all areas with the color of the sample inside the tip of the brush. Last, Find Edges, acts as the first but preserving the sharpness the edges of the form.

For Tolerance, we could say that sets the range of colors similar to the sample to be replaced. Greater tolerance allows the sampled substitute similar colors. While zero tolerance areas only replace the exact color to sample.
To define a smooth edge corrected areas, select Smooth.

Now you can simply click on a location on the canvas and start painting tool with color Active as set forth in the above.