Example
This is a simplified example of using MultiFill and Flatten. Download the sample Photoshop file to follow the steps.
1. You start with a scanned image.
Make the line-art 100% black and save a copy in an extra layer.
2. Fill the picture with the MultiFill.
Menu:Filter->BPelt->MultiFill... The MultiFill.aco palette is chosen to get the colors from. You can make your own palette with the Photoshop Preset Manager. There is also a random colors option. The Join option is set to 3 pixels, this means that any white area's up to 3x3 pixels are joined to the nearest larger area. The Flag option is set to 10 pixels, white area's up to 10x10 pixels are painted with the flag color. Click the swatch to open the color picker for selecting a flagging color.
The result from MultiFill.
You can see the flagged area's in the lower left and right corners. On the middle right are some joined spots.
You can see the flagged area's in the lower left and right corners. On the middle right are some joined spots.
3. Execute the Flatten filter.
Menu:Filter->BPelt->Flatten
4. The result, with the lineart set to 70% opacity.