Colour Filter
The colour filter allows you to control the colours that make up an image.
Two colours are required to define the colour filter. Pushing the “Set colours” button in the Filter Control Box will assign the “paper” and “ink” colours to the “Low” and “High” values required.
When applied pixels in an image that are “dark” will be closer to the “Low” value and pixels that are “Light” will appear closer to the “High” value.
In
this example, the “low” value is set to dark blue, and the “high” value is set
to bright green. Setting the “Low”
value to a bright colour and the “high” value to a dark colour is perfectly
acceptable, and will “invert” the effect.
Note that this image is a Jpeg.
Information on using the: Filter Tool