User Guide

GNU Image Manipulation Program
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15.3.3 Alien Map 2
15.3.3.1 Overview
Figure 15.21: Alien Map 2 filter example
(a) Original image (b) Filter applied
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.
15.3.3.2 Options
Figure 15.22: 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.