duotone filter base

by Lazur - uploaded on October 21, 2016, 9:03 pm

Evolution of a simple duotone filter.



First square is unfiltered,

second one is filtered to greyscale colours, third one has a colormatrix set "luminance to alpha",

4th one is superimposed on a white fill, resulting in an inverted greyscale appearance,

5th one has another luminance to alpha set, that is what it was all about.

As a result, the 6th one is using 2 flood fills and compositing, making up a duotone shading.

The last one has a component transfer filter primitive added, which you can use for fine tuning the look if you apply the filter on a photograph.