We can see in this example how an image with different colors is broken down into each of the color channels. White is the sum of all colors, then has components in all cases.
The first image is the original, each of the remaining three of the components is. When the selected color component, the result is a white image, when there is not, the result is a black image. Gray to indicate that there is a component in a greater or lesser extent.
The filter 'connect its input to an image, obtaining four output channels, the three color channels and an additional transparency (alpha).
Apply these filters to a complex image to see its effect.
In the example, the image has been decomposed into the primary colors using the RGB filter. Then again we have added those channels but reversing two of them, blue and green, through the filter opposite “Combine RGBA”.
The result can be seen in the following images, investment and background colors is outstanding Hummingbird, whereas red elements like staying with a shade. Logically secondary colors, como el amarillo, sufren una transformación (violetas). Este efecto sobre los secundarios se podría limitar con el uso de mascaras.