hotcheck.h File Reference

#include "coreexp.h"

Macros
#define	VID_NTSC   0
#define	VID_PAL   1
#define	HOT_FLAG   0
#define	HOT_SCALE_LUM   1
#define	HOT_SCALE_SAT   2

Functions
CoreExport void	BuildHotTable (int video_type=VID_NTSC)
CoreExport int	HotLimit (Color48 *thepix, int method=HOT_SCALE_LUM)
	This method is called to perform the video color check for each pixel. More...

Macro Definition Documentation

#define VID_NTSC   0

#define VID_PAL   1

#define HOT_FLAG   0

#define HOT_SCALE_LUM   1

#define HOT_SCALE_SAT   2

Function Documentation

CoreExport void BuildHotTable

(

int

video_type = VID_NTSC

)

CoreExport int HotLimit	(	Color48 *	thepix,
		int	method = HOT_SCALE_LUM
	)

This method is called to perform the video color check for each pixel.

This function can be used to correct a pixel with RGB values that will give "unsafe" values of chrominance signal or composite signal amplitude when encoded into an NTSC or PAL color signal. This happens for certain high-intensity high-saturation colors that are rare in real scenes, but can be present in computer generated images.

Parameters

thepix	The pixel to check and correct if necessary.
method	One of these values: HOT_FLAG: Flag the pixel as black. HOT_SCALE_LUM: Correct by scaling the luminance. HOT_SCALE_SAT: Correct by scaling the saturation.

Returns

A non-zero value if the color is corrected. Otherwise, zero.