IndexedToRGBExample.rst

Some algorithms produce an indexed image as output. In such images, each pixel is given a value according to the region number it belongs to. This value starting at 0 or 1 is usually an integer value. Often, such images are produced by segmentation or classification algorithms.

If such regions are easy to manipulate -- it is easier and faster to compare two integers than a RGB value -- it is different when it comes to displaying the results.

Here we present a convient way to convert such indexed image to a color image. In such conversion, it is important to ensure that neighborhood region, which are likely to have consecutive number have easily dicernable colors. This is done randomly using a hash function by ScalarToRGBPixelFunctor.

The original indexed image (left) and the conversion to color image.