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3.3.  Alien Map 2

Revision History
Revision $Revision: 1.22 $ 2006-10-24 j.h

3.3.1.  Overview

Figure 11.20.  Alien Map 2 filter example

Alien Map 2 filter example
Alien Map 2 filter example

You can find this filter through Filters->Colors->Map->Alien map 2.

This filter renders very modified colors by applying trigonometric functions. Alien Map 2 can work on RGB and HSV.

3.3.2.  Options

Figure 11.21.  Options for the “Alien Map 2” filter

Options for the Alien Map 2 filter
Preview

This preview displays results of filter application interactively.

Mode

Radio buttons RGB Color Channel and HSV Color Channel let you select the color space you want to use.

Check boxes Modify ... Channel let you select RGB/HSV Channel you want to work with.

Sliders

For each channel, you can set Frequency (0-5) and Phaseshift (0-360) of sine-cosine functions, using either sliders or input boxes and their arrowheads.

Frequency around 0.3 to 0.7 provides a curve that is similar to the linear function (original image), only darker or with more contrast. As you raise the frequency level, you'll get an increasing variation in pixel transformation, meaning that the image will get more and more “alien”.

Phase alters the value transformation. 0 and 360 degrees are the same as a sine function and 90 is the same as a cosine function. 180 inverts sine and 270 inverts cosine.


 
 
  Published under the terms of the GNU General Public License Design by Interspire