Color Reduction with Marker

Color reduction using Sharpie filters is used when you have detailed images. These filters try to identify and highlight the figures that make up the image. Depending on the filter chosen, the figures must have sufficient contrast and must not be too small.

The Sharpie filters are three:

- Marker Color: analyzes the colors of the image and highlights the outlines according to their contrast.

- Marker Brightness: analyzes the colors of the image and highlights the outlines according to the contrast of their brightness.

- Saturation Sharpie: analyzes image colors and highlights outlines according to their saturation contrast.

Unlike Pencil filters, Sharpie filters fill in black or dark surfaces. This filter is not suitable for night photographs, unless you activate the box to make the image negative.

These filters have some parameters:

- Contrast: contrast value between colors, brightness or saturation of adjacent points, in order to detect edges to be highlighted. A low contrast identifies more subtle variations, while a high contrast identifies more pronounced variations.

- Brightness: the limiting brightness value for dark, then fully filled surfaces. Low values will detect and fully fill only very dark or black surfaces, while higher values will fill lighter and lighter surfaces.