![]() ![]() (*) There are more colors because the dithering can use colors that aren't in your gradient, but which, combined with neighboring pixels with colors that are or are not in the gradient, generate a result which is visually similar to the gradient. The histogram is very similar to the banded picture one and you still have very few colors (76 (*)) but since the pixels are arranged randomly this is much less visible (this is a reload of the dithered image saved as an A1R5G5B5 bitmap): ![]() This can be done with Colors > Dither and using 32 values per channel: The end result has very few colors (27) so not even all combinations are used.Ī solution here is to "dither": your pixels assume the rather quantized colors but are spread a bit randomly. When you reduce this to 5-bit/channel: your red channel goes from 35 to 4,so the 31 values are now 4 values, and likewise your green channel has 6 values and your blue as 9-10. 1 Answer Sorted by: 2 The best way to replace a range of gray values (even very dark gray) with some color is to use Color>Map>Gradient map But if you just want a mask, duplicate the layer, Color>Desaturate and then use the Threshold tool, or Brightness/Contrast for a smoother transition, or even the Levels or Curves tools. So, your initial image a small range of colors (still, 592 different RGB values, according to Color > Info > Color cube analysis): radial gradient and figure 8 9 b shows the corresponding dialog for the. By changing the gradient, you can affect what parts of the image go to black and which parts go to white.In your A1R5G5B5 bitmap, you only have 5 bits per channel, and so 32 values over the full range (in other words, a step of 1 over 5 bits is like a step of 8 in a regular 8bit/channel image). You can use this to convert an image to black and white. I use some preset gradients found in GIMP to create this effect, while also showing you how to create the effect using your own custom gradient. The serious side of the Gradient Map tool is its black and white gradient. Your text layer is basically a 'mask' on top of the two below it. If you want the effect reversed, you can reverse the gradient and the colors are applied in reverse. You seem to want a flat color background with no texture, so that means you can make the text transparent and layered over a 'pixel map' which can be made by using the gradient of your choice as the 'base layer' with a 'pixel map' on top. The midtones are colored with the color in the middle of the gradient. You can modify these or create your own gradients. So, where the image is darker the tones at the left of the gradient are applied and where the image is lighter the tones at the right of the gradient are applied. Photoshop provides a number of built-in gradient maps that work well with images. It applies a gradient of color to your image depending on the tones in the image. Im not sure if Gimp's gradient map is the best. Gimp however is a raster editor and a gradient map cannot be switched on or off or live edited. Photoshops gradient map is vector technology and can be switchd on and off, without changing the original image. Its under Colours -> Map -> Gradient Map. It is an adjustment so you can find it on the Adjustment menu and you can also apply it using an Adjustment Layer. Yes, there is a Gradient Map function in Gimp. I’ll show you how to use it for both purposes.īefore we start a word about how the Gradient Map works. ![]() Maybe the answer is just that it is not possible in Gimp / no plugin is offering that (beside scripting). The Gradient Maps tool has a serious side in creating custom black and white conversions and a more frivolous one in adding color to an image. Well, my question was just 'how to apply or load a colormap encoded as an image', which might translate into 'how to load a gradient or palette as 1D rgb image, LUT(value) being encoded as img(x/xmax)'. ![]()
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