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SGI Developer Toolbox 6.1
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SGI Developer Toolbox 6.1 - Disc 4.iso
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scale.hlp
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@c@C1@b@_ Raster Scale
Scale an image by arbitrary scale factors or to fit it into a
pre-determined size.
@b Options
@f Scale Factors
Scale factors in X- and Y-directions can be adjusted individually (if
aspect ratio is not to be kept) or simultaneously (keeping the aspect
ratio) by pressing the mouse on the arrow buttons.
@f Reporting
The current scaling request can either be reported as scaling
factors (current size/original size) or as the resulting size
in pixels. You can choose the reporting method by toggling the
ShowSize and ShowScale buttons.
@f Anti-aliasing
By default, subpixel sampling is enabled and therefore, the resulting
image will be in RGB format. If exact number of colors are to be
kept, anti-aliasing can be turned off by toggling this flag.
For Scale factors greater than 0.5, a simple pixel blending can be used
for subpixel sampling without causing too much error but much faster.
General box sampling is enabled by clicking the mouse on Hi-Fi button.
@f Fitting the image into a fixed size
To enable this feature, press the Exact button. You can adjust scaling
factor independently. In actual scaling, the smaller of the two
factors is used and aspect ratio is preserved by filling the
other direction with a solid color, which can be set by pressing
FillCol button.