Gimp desaturate tool

To select the two halves of the red circle, you have to combine multiple selections. In order to add new areas to your selection, hold down the Shift key while clicking the next spot on your image. You can also remove areas from your current selection by holding the Ctrl key. If the selection gets filled with a color instead, go back to Step 1 and try adding your alpha channel again.

You may find yourself editing the Cyan section instead of Green, or Magenta instead of Red. Now comes the fun part. You can also turn on Split Preview to show the unedited image next to the results of your adjustments. I regret my choices! You can adjust the Saturation slider to 0 to completely remove all hue from the selected areas — and also to save your eyes.

Whatever you choose to do, be sure to use your editing powers for good the next time you remove color in GIMP! Your email address will not be published. We are not associated with them. Skip to content. This photo of the iconic London tube station signage makes a great example for color removal.

The wrong threshold setting creates an incomplete selection. Increasing the threshold setting overcomes the slight gradient from top to bottom. Begone, gray pixels! Hue-Saturation is a powerful tool for removing colors. I've tried many image editing programs. GIMP is a free and powerful software, but not exactly user-friendly until you get comfortable with it, and I wanted to make the learning process easier for you here.

This means that you then can paint on the layer, or individual parts of it, using non-gray colors. This command only works on layers of RGB images. If the image is in Grayscale or Indexed mode, it can do nothing. Figure Mode: Five options are available for converting from color to black and white:. The shades of gray will be calculated using linearized sRGB as. Using the five modes to convert two very different color images to black and white.

The degree and direction from which the various ways to convert an image to black and white diverge from a straight Luminance conversion to black and white depends on:. How saturated the colors in the original image happen to be, with more saturated starting colors such as the red globe and the bright yellow sunflower producing greater amounts of deviation from a straight Luminance conversion. The hues for example yellows vs reds of the various saturated colors in an image also make a difference.

Being the maximum of the RGB channel values for each pixel, an HSV Value conversion to black and white is always lighter than the original color image, and also lighter than all the other ways to convert to black and white.

For the red globe Lightness HSL produces a result very similar to Luminance, and Luma produces a conversion that is much darker. For the sunflower, Luma produces a result very similar to Luminance, and Lightness HSL produces a conversion that is much darker.

Notice that the less saturated parts of each image look more or less the same, regardless of which method is chosen for converting from color to black and white. More information about Luminance:. For convenience we say "Luminance", but what we really mean is "Relative Luminance".

GIMP 2. More information about Luma:. Luma corresponds to GIMP 2. Compared to GIMP 2.