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error 404 srcAndReverse | revDocs | RunRev
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Version
srcAndReverse
Basics
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Type
Keyword
Syntax
Introduced
1.0
Environment
Desktop, Web and Server
Platform Support
Windows,Linux
Security
None required
Summary
Specifies one of the transfer modes that can be used with the ink property.
Examples

set the ink of field "Check" to srcAndReverse

Additional Comments
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Use the srcAndReverse keyword to invert the color underneath the light-colored parts of an object.

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.

The srcAndReverse transfer mode performs the following steps to compute the color of each pixel:

1. Each component of the color underneath the object--the number indicating the amount of red, green, or blue--is changed to its inverse. (If the color is expressed as three integers between zero and 255--one for each of red, green, and blue--then the inverse of each component is equal to 255 minus the component's value.)

2. Revolution performs a bitAnd operation on each component of the inverted object color with the corresponding component of the color under the object.

Each component of the resulting color is equal to the result of this expression:

object component bitAnd (255 - background component)

The effect is that the lighter an object is, the more transparent it is to the inverted color beneath. White parts of an object completely invert the color underneath them, and black parts are completely opaque.

For example, suppose an object's color is 45,0,255, and the color of the pixels under the object is 20,45,100. The inverse of the color underneath is obtained by subtracting each component from 255, yielding 235,210,155. If the srcAndReverse transfer mode is used, the object's displayed color is 41,0,155 (the decimal equivalent).

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

User Comments
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