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.

See Also

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

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 20.0.2018.2.25
Products | Support | Contact Us | Copyright Notices
© 1991-2018 LEAD Technologies, Inc. All Rights Reserved.
LEADTOOLS Raster Imaging C API Help