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a=SAMPLEA(MODE[0-2]) (result is SAMPLE) |
Items in CAPS are 0/1 switches or switches with more options than 0/1. |
Sample Alpha returns the alpha level for the region selected. You can use the returned value to adjust the alpha channel, using the Make Alpha operator.
Alpha Action Summary
Alpha channel transparency is 100% and opacity 0% when an alpha channel value is 0.
Alpha channel transparency is 0% and opacity is 100% when an alpha channel value is 255.
Transparency and opacity vary linearly between 0% and 100% depending on the alpha value present for each pixel in an image.
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Level
This is the level determined by the operation. Once taken, this level is also made available to the
Make Alpha operator, via the "
Method
You may choose the Average, Minimum or Maxuimum of the alpha levels collected from within the region of your area selection.
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WinImages F/x Manual Version 7, Revision 5, Level B |