It’s a step I usually did in Gimp ( see on my pencil to digital painting tutorial ) and I’m happy to see the feature now in Krita too. 10 months ago is there a way to remove a specific color from a layer Help / Question I accidentally colored white in my lineart layer and didnt notice that until i turned off the background layer. You can easily ‘lock’ the alpha of the layer, then color only your lines now. What is the advantage compare to put your pencil artwork on a ‘mulitply’ layer blending mode ? Due to that step, if we put a layer filled with a base color below the filtered image, we will get original image! Secondly, Krita apply an inverse “composite over” to every pixel.As already mentioned Krita use deltaE function to calculate this difference. You can select with shapes such as rectangles and circle, paint your selection, polgon selection, select by color, select by Bezier. When a painting or drawing tool is selected the Color Sampler tool can also be quickly accessed by pressing the Ctrl key. The less the difference, the more opacity is decreased. This tool allows you to choose a point from the canvas and make the color of that point the active foreground color. Firstly, Krita calculate the difference between the image pixel and the base color and decrease the pixel’s opacity according this difference.
You can choose to what extent you want to remove the background by changing threshold value.ĭmitry explain the filter’s algorithm on his blog : To find the feature, in the menu : Filter > Color > Color to alpha.Īlgorithm differs from the one used in Gimp ( also named ‘Color to Alpha’ ) : Krita use CIE deltaE function to calculate the difference between the image and the base color, so it is more flexible and configurable. Dmitry Kazakov just updated Krita’s Color to Alpha filter on the development 2.7pre-alpha version ( already on Git master ), so it can now be easily used for removing background from scanned sketches.
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