![]() Left: two examples of monochrome dithering, firstly pattern dithering and secondly diffusion dithering. It's usually synonymous with amplitude modulation halftoning, where a fixed pattern of dots vary in size in order to create the illusion of continuous tone. ![]() Halftoning is a term used in the print industry to describe how to reproduce varying tones with significantly fewer inks. The Steps parameter determines how many colors are allowed per component.I disagree with John's assertion that the difference depends on how many colours you use, I believe it's possible to dither using a single colour. This filter decreases the amount of colors in an image. Smoothnessĭetermines how much each patch’s outline is smoothed out. Brush-sizeĭetermines how large the individual patches are. Oilpaint ¶ĭoes semi-posterisation to the input-image, with the ‘brush-size’ determining the size of the fields. Raindrops ¶Īdds random raindrop-deformations to the input-image. Makes the input-image pixely by creating small cells and inputting an average color. You can create index painting such as one shown below with the help of this filter. You can choose the required colors and ramps in the index color filter dialog as shown below. You can see the example below, the strip below the black and white gradient has index color applied to it so that the black and white gradient gets the color selected to different values. The index color filter maps specific user selected colors to the grayscale value of the artwork. ![]() Foreground & BackgroundĬhange what color and opacity are used for the foreground (part of the image formed by the pattern shapes) and the background. HardnessĬontrols how hard or soft are the borders of the halftone shapes. These options apply to the result of combining the screen image with the original image. For more information see this page on fill layer generators and their options. ![]() Also the user can make his own patterns by using the pattern generator and custom pattern images. This way the range of possible results can grow as new generators are added to Krita. The filter uses the fill layer generators to create the screen (pattern) image instead of using a predefined set of patterns and options. The halftoning process works by making a pattern image (commonly named screen) that is combined with the original image in a specific way. When the selected mode is Independent Channels, multiple tabs for the different channels appear to let the user choose different options for each one otherwise no tabs for the channels appear and there is only one set of options. This is useful to add texture to the smooth semi-transparent borders of a layer. With this option the halftoning is applied only to the alpha channel (you may see no change when all the pixels of the image are fully opaque). This allows applying the halftoning to each channel of the image independently, potentially with different parameters, giving an effect similar to the one in colored magazine images. The resulting effect is like the one used in black and white newspaper images. In this mode the image is first converted to grayscale and then the halftoning is applied. The halftone filter tries to replicate the continuous-tone of the original image through the use of simple shapes that vary in size. The artistic filter are characterised by taking an input, and doing a deformation on them.
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