Autodesk 00126-050008-1620A - Autocad 2006 Essentials User Manual page 88

WiseImage – User's Guide
Range by RGB
With this method you can convert color dots of the specified RGB ranges to image
dots.
To specify an RGB range you should first select a central range color. The Red,
Green, and Blue components of this color define the position of the RGB range
central point. For each of the color components (R, G, and B) you should specify the
appropriate range half-lengths. The range half-length for the R, G, or B component
is the number of R, G, or B levels below and above the selected R, G, or B level.
For example, if the R level of the selected color is equal to 50 and the range half-
length for the R component is 10, then the RGB range includes colors with the R
components from 40 to 60.
Range by HSV
This method allows you to convert pixels of analogous colors to image dots.
Analogous colors are closely related colors in the human perception of color, e.g.
red - orange, dark green - light green, etc.
To convert an image using Range by HSV, you should specify one or more HSV
ranges. The HSV range is defined by a selected color and H, S, V range half-
lengths. The HSV range is similar in design to the RGB range described above.
Note that Hue is expressed as an angle between 0° and 360°, Saturation and Value
are measured as a percentage from 0 to 100.
Þ Using this method for converting grayscale images provides a low-quality
result.
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