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error 404 subOver | revDocs | RunRev
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Product Edition
Version
subOver
Basics
Expander triangle
Type
Keyword
Syntax
Introduced
1.0
Environment
Desktop, Web and Server
Platform Support
MacOS,Mac OS X
Security
None required
Summary
Specifies one of the transfer modes that can be used with the ink property.
Examples

set the ink of last card button to subOver

Additional Comments
Expander triangle

Use the subOver keyword to combine an object's color with the colors underneath it.

Comments:

The ink property determines how an object's colors combine with the colors of the pixels underneath the object to determine how the object's color is displayed. When the addOver mode is used, each component of the color underneath the object is subtracted from the corresponding component--red, green, and blue--of the object color. If the result is less than zero, the component rolls over backward, back to 255.

For example, suppose an object's color is 25,250,150, and the color of the pixels under the object is 60,40,100. If the subOver mode is used, the object's displayed color is 220,210,50.

The subOver mode can be used only on Mac OS systems. On Unix and Windows systems, objects whose ink property is set to this mode appears as though their ink were set to srcCopy.

User Comments
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