User Guide

CHAPTER 13. FILTERS 154
and vertical lines, this may actually yield the best results. For other types of
images, the quality will be poor.
• Adaptive Random is similar to Adaptive Hybrid, except that the modifications
to the Floyd-Steinberg algorithm are slightly different. This is slower than
Adaptive Hybrid on most systems. For some images the quality may be
better, but generally Adaptive Hybrid should yield slightly superior images.
• Hybrid Floyd-Steinberg uses the modified Floyd-Steinberg algorithm of Adaptive
Hybrid on the entire image. Generally, the results are poor in pale regions.
• Random Floyd-Steinberg uses the modified Floyd-Steinberg algorithm of
Adaptive Random on the entire image. Generally, the results are poor in
pale regions.
13.119 PSP
Overview
GIMP can read images in the PSP format. PSP (Paint Shop Pro) images are
created by the Windows graphics program Jasc PAINT SHOP PRO. The format supports
advanced features such as layers and channels. PAINT SHOP PRO 6 also includes
vector layers, however, GIMP cannot read these files.
13.120 Qbist
Overview
This plug-in renders essentially randomly mixed colors in a potentially impressive
display of algorithmic disco.
To be more precise, it provides nine sets of equations which alter the image appear-
ance drastically. The resulting effect is a specific mesh of colors, arranged in varying
ways, according to the output of the given equation. Generally, this is some number of
gradient blends, intermingling to create new gradients and shapes. Qbist Options
In the Qbistdialog, nine preview boxes are displayed. The preview in the center is
the active one. That is, without further input, the preview displayed in the center will be
rendered into the image. Each of the previews are image buttons. Selecting any preview
enacts a corresponding equation. The selected equation is applied to the active preview
and changes all 9 previews to reflect a new set of input parameters. When a desirable
effect results, pressing the OK button applies the center preview to the current image.
Cancel will close the dialog without making any changes to the original image.
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The generated images do not relate in any significant way to the original
image content. The same equations will not always correspond to the
same preview button. Qbist is, effectively, a randomizer.
This filter includes a Load and Save function for presets. Because the generated
images and equations do not rely on the original image content, there is no exact way
to guarantee an absolute reproduction of any set of effects. Therefore, as an alternate,
the user may save at least the current, center preview parameters.