L_SetPaintContrast

#include "l_bitmap.h"

L_LTDIS_API L_INT L_SetPaintContrast(pBitmap, nValue)

pBITMAPHANDLE pBitmap;	pointer to the bitmap handle
L_INT nValue;	amount of contrast change

Sets the contrast value for the specified bitmap. This value can be retrieved using the L_GetPaintContrast function.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap to be affected. This cannot be NULL.
nValue	Amount of contrast change. Valid values are -1000 to +1000.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

When applying contrast, gamma, and intensity changes to a bitmap, LEAD applies the changes in the following order:

Contrast

Intensity

Gamma

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

Win32, x64, Linux.

Example

This example sets the increases the current paint settings by 100 and then forces a repaint.

L_INT SetPaintContrastExample(pBITMAPHANDLE pBitmap) 
{ 
   L_INT nRet; 
   L_INT          nContrast; 
   L_UINT         uGamma; 
   L_INT          nIntensity; 
   /* Get the values */ 
   nContrast = L_GetPaintContrast (pBitmap); 
   uGamma = L_GetPaintGamma (pBitmap); 
   nIntensity = L_GetPaintIntensity (pBitmap); 
   /* Set the new values */ 
   nRet = L_SetPaintContrast (pBitmap, nContrast + 100); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = L_SetPaintGamma (pBitmap, uGamma + 100); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = L_SetPaintIntensity (pBitmap, nIntensity + 100); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
}

Help Version 19.0.2017.10.27

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LEADTOOLS Raster Imaging C API Help

Introduction

Version History

Getting Started

LEADTOOLS Raster Imaging Features

Redistributables/Files To Be Included With Your Application

Functions:	L_GetPaintContrast, L_GetPaintGamma, L_SetPaintGamma, L_GetPaintIntensity, L_SetPaintIntensity
Topics:	Raster Image Functions: Displaying Images
	Changing Brightness and Contrast
	Raster Image Functions: Changing Brightness and Contrast