L_GetPaintGamma

#include "l_bitmap.h"

L_LTDIS_API L_UINT L_GetPaintGamma(pBitmap)

/* pointer to the bitmap handle */

Gets the current gamma correction value for the specified bitmap. This value is set by the L_SetPaintGamma function.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap from which to retrieve the gamma value. This cannot be NULL.

Returns

Because this is an unsigned integer, the return value is 100 times the actual gamma value. For example, 235 represents a gamma value of 2.35. Gamma can be any number greater than 0. The default value is 100.

Comments

Intensity values ideally follow a logarithmic progression, because the eye perceives changes in intensity as being equal when the ratio of change is equal. For example, we would see a change from 0.1 to 0.2 as being equal to a change from 0.2 to 0.4.

Gamma is a standard constant that is used to calculate the progression. For most CRTs the gamma constant is in the range of 2.2 to 2.5.

Required DLLs and Libraries

LTDIS

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Windows 2000 / XP/Vista, Windows CE.

Functions:	L_GetPaintContrast, L_SetPaintContrast, L_SetPaintGamma, L_GetPaintIntensity, L_SetPaintIntensity, L_DlgGammaAdjustment
Topics:	Raster Image Functions: Displaying Images