open-source cross-platform real-time video effects plugin system
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ContrastPS
Thu, 02/07/2008 - 10:24 — ckorda
Freeframe ID:
BCPS
Number of Inputs:
1
Platform:
Windows
Plugin Type:
Effect
License:
Open Source
Freeframe Version:
FF 1.0x
Developer:
Chris Korda Photoshop-style brightness/contrast filter.
PARAMETERS
1. Brightness: 0 = minimum, .5 = normal, 1 = maximum
2. Contrast: 0 = all gray, .5 = normal, 1 = thresholding
MMX optimized. Supports 32-bit color only.
To exactly emulate Photoshop's behavior, the brightness parameter is scaled by 40%, and therefore does not saturate to black/white. Note that when reducing Contrast, Brightness is applied first, whereas when increasing Contrast, Brightness is applied afterwards. Also note that maximum Contrast (thresholding) is handled as a special case, since it would otherwise cause a divide by zero.