Gamma

Quick Reference to Scripting Command
a=GAMMA(p)
Items in CAPS are 0/1 switches or switches with more options than 0/1.

The Gamma operation is similar to the Contrast operation. Both operations evaluate the pixels in the selected area based on the pixel brightness. The difference is that contrast will linearly brighten or darken a pixel, and Gamma brightens or darkens the pixel based on its original value. A Gamma operation is a contrast operation that is modified to be closer to the way your eye responds to light.

Gamma Operation Dialog

Reduced Gamma

Original Image

Increased Gamma

Gamma Controls

Trends

Some of the controls have a Trend button next to them. These trend buttons allow you to set variables over a series of frames. Each frame of any animation may 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. Trend graphs have equidistantly spaced vertical lines. For animations under 100 frames in length, each of these lines represents a frame in the animation. The number of frames in any one sequence can be altered using the Sequence controls item from 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.

Gamma

The Gamma control allows you to adjust the dark and light regions of the image. An increase in gamma will lighten the image, and a decrease will darken the image. The control ranges from -200 to 200, and can be set using the slide gadget or text entry area.

WinImages F/x Manual Version 7, Revision 5, Level B