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Fill Tool: Understanding 'Fill Only Contiguous Points'

The 'Fill Only Contiguous Points' option in the fill tool settings can be an extremely useful feature. The way the fill tool works is when it is applied, the tool determines the color of the point under the cursor (original color) and changes it to the foreground color (new color). From there it looks at the points around the original point. Whichever adjacent points are the original color those are also replaced by the new color. Then we examine the points adjacent to THOSE points and so on until the entire region is filled. With the 'Fill Only Contiguous Points' option enabled, this activity is limited only to the region where the original point was. With it off the tool examines the entire image for instances of that original color and then also performs the fill on those points as well. This might be better demonstrated with an example:


This is the original image. Notice there are three bands of white.


When we apply the tool with this option on, only the band where the cursor is gets filled.


Using the original image and filling with the option off, all of the bands get filled.

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