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16.119 - Clip Alpha

Quick Reference to Scripting Command
a=CLIPALPHA(ASSIGN AS SOURCE, DISPLAY CLIP, REPLACE IMAGE)
Items in CAPS are 0/1 or ranges with more options than just 0/1.
Ranges other than 0/1 are indicated by brackets, such as [0-2].


The Clip Alpha operation allows you to clip out a section of an image's alpha channel.

This alpha channel will then become a regular image. This tool is mainly used to perform alterations and effect on an alpha channel. This alpha channel image can then be returned as the alpha channel for the original image using the Make Alpha control. This process of altering an alpha channel can also be done by using the Alpha Channel controls in the Settings menu.


Operator Dialog

16.119.1 - Clip Alpha Controls

16.119.1.1 - Trends

Operator dialog controls that have a Trend button next to them offer animation functionality. Trend allows you to set that variable over a set of frames. Each frame of the animation can be thought of as a slice of time. The trends allow you to alter some, all, or none of the variables for a particular time slice. Variables that have multiple states can be set to any of a number of values in the trend. Variables that are either on or off can only have an on or off value in the trend. You will notice that the trend graphs have equidistantly spaced vertical lines. Each of these lines represents a frame in the animation. The number of frames can be altered using Sequence controls... in the TimeLine pull down menu. Animation lengths of 100 - 999 frames will be represented with a vertical bar being 10 frames, and animation length greater than 1000 frames will have a vertical bar for every 100 frames. Click here to view more information on Trends.

16.119.1.2 - Assign the Result as Source

 Assign the Result as Source , when selected, will make the alpha channel clip the source image. This allows you top alter the alpha channel, and then return it to the original image using the Make Alpha option of Mask with Source Luminance. Alpha channels can also be modified using the Alpha Channel controls in the Settings menu.

16.119.1.3 - Display the clip

 Display the clip , when checked, will result in the image being visible.

16.119.1.4 - Replace Image

 Replace Image , when checked, will not produce a new image, but instead replace the image you are working on with the clip.

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