The Stretch Contrast HSV command does the same thing as the Stretch Contrast command, except that it works in HSV color space, rather than RGB color space, and it preserves the Hue. Thus, it independently stretches the ranges of the Hue, Saturation and Value components of the colors. Occasionally the results are good, often they are a bit odd. “Stretch Contrast HSV” operates on layers from RGB and Indexed images. If the image is Grayscale, the menu entry is insensitive and grayed out.

8.19.2. “Stretch Contrast HSV” example

Figura 16.185. Imagem original

The active layer and its Red, Green and Blue histograms before “Stretch Contrast HSV”.

Figura 16.186. Imagem após o comando

The active layer and its Red, Green and Blue histograms after “Stretch Contrast HSV”. Contrast, luminosity and hues are enhanced.