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Introduction  
Updated Oct 6, 2012 by tibor...@gmail.com

#Introduction and examples to Rainbow Tonemapping.

Introduction

It is not easy to describe purpose and algorithm behind this plugin. I might say the goal is to create fancy or surrealistic images from your photos. The base explanation is that RGB values (either average of them or each of them separately) are periodically replaced by defined range of colors. Mathematically it resembles sinusoid curve with few periods where

periods = 255 / period_lenght

Resulting effect of this sinusoid looks like this:

bottom strip is original, middle strip is to show tonemapping with lenght 80 (three gradients are created within originale lenght 255) and border colors are black and white.

Upmost strip is example with smaller new gradient lenght and custom border colors (shade of red and yellow).

Tonemap Modes

The plugin work with two modes

  1. 1-band. Tonemapping are based on brightness, and final images are simple transition between two colors. In fact above gradients corresponds to this mode
  2. 3-bands. Here every channel is mapped separately. The result is more colorful.

For examples look below

Plugin window look like this:

and can be found at FILTERS/ARTISTIC/RAINBOW TONEMAP

Examples

3-bands mode:

1-band mode:

Plese note here that when you leave default border colors white and black, result is black and white image. But feel free to experiment and change these border colors.

What's next?

Well, I have no new ideas. If you have any, let me know.


My email: tiborb95 at gmail dot com



This plugin is distributed for free and under GPL license. I dont expect earning big money from this, but if the tool is useful / fun to use for you, you can consider paying a voluntary price for the time I spent developing and maintaining it.


You can also visit homepages (with introduction and examples) of other gimp plugins I made:


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