Colours Brightness Contrast Gamma filter for Virtual Dub

 

(c) Alessandro Malanca - Jul / 2002

http://web.tiscali.it/minomala/index.htm

 

[Place this text file in the VirtualDub plugins directory]

 

This filter allows correcting the colours brightness, gamma and contrast. A histogram shows the distribution of pixel values globally and for each colour. Controls are not as much sensitive; if you need more correction just ask.

 

Controls description:

 

Select Chan.:

This button selects the current channel: global - Red - Green - Blue. Corrections are applied to the selected channel.

 

Brightness sliders:

Corrects the brightness globally and for red, green or blue colour.

 

Gamma sliders:

Corrects the gamma (mid tones luminance) globally and for red, green or blue colour.

 

Contrast sliders:

Corrects the contrast globally and for red, green or blue colour.

Balance media: This value is the reference point for brightness control. Values above are incremented, and below are decremented. You can also set it to 0 to have the usual contrast control.

 

Colours histogram:

In preview mode, shows the distribution of pixel values from 0 to 255; globally and for red, green or blue.

Max: is the amount of points indicated by the histogram max value.