colour turbulence

by Lazur - uploaded on February 9, 2017, 12:49 pm

Original concept recreated by filtering.

Such a filter is built up by two parts: first, generating a basic texture.

Original image looked way similar to a turbulence/fractal noise, however it turns out it is a tad bit different looking.

The other part is mapping a colour gradient to the texture's luminance levels.

Theoretically that is a pretty straightforward thing to achieve, however there are some problems with it.

First and foremost the shallow colour depth how it is rendered, resulting in banding -even more than present on the original image.

Blurring may be used but I rather not have included that in the filter chain.

Other problems with gradient mapping are somewhat can be handled.

It is achieved by a component transfer filter primitive that uses table inputs on the rgb channels. That means you are strict to represent a gradient where each step is in equal distances. The one used on this image consists of 26 steps -visible larger steps needed to be covered by more steps of the similar length-. Matching a custom gradient with that model is a quite tedious process with trial and error.

2017 abstract background color colormap colour colourful colour map component transfer design filter in action fractal noise gradient gradient map Lazur luminance pattern refixes remix+272316 texture tone turbulence URH wallpaper
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