| 3.3.  Alien Map 2 | ||
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3.  Color filters |   |
| 3.3.  Alien Map 2 | ||
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3.  Color filters |   |
You can find this filter through → → → .
This filter renders very modified colors by applying trigonometric functions. Alien Map 2 can work on RGB and HSV.
This preview displays results of filter application interactively.
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.
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 ΓÇ£alienΓÇ¥.
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.
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| 3.2.  Adjust FG-BG   |
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 3.4.  Two Colors Exchange |
