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L_AdjustBitmapTint

Summary

Adjusts the bitmap tint by changing the colors in an image by using two separate color wheel rotations.

Syntax

#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_AdjustBitmapTint(pBitmap, nAngleA, nAngleB, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap to which to apply the effect.

L_INT nAngleA

Value that represents the amount of change in the A angle, in hundredths of degrees. Valid values range between -18000 and 18000.

L_INT nAngleB

Value that represents the amount of change in the B angle, in hundredths of degrees. Valid values range between -18000 and 18000.

Returns

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

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

This function changes the colors in an image by using two separate color wheel rotations. For the nAngleA parameter, a positive rotation takes blue toward green and red, as shown in the following figure:

$image\nAngleA.gif$

Negative rotation has the opposite effect. For the nAngleB parameter, a positive rotation takes red toward green. Negative rotation has the opposite effect.

Use the L_ChangeBitmapHue function to rotate the color wheel in either direction using one angle change that changes each color in the image. A 180-degree rotation in either direction changes each color to its complement. Positive rotation takes red toward green, green toward blue, and blue toward red. Negative rotation has the opposite effect.

This function only supports colored images.

This function supports 48 and 64-bit color images.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Adjust Tint Function - Before

Adjust Tint Function - After

View additional platform support for this Adjust Tint function.

Required DLLs and Libraries

LTIMGCLR
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

The following example loads a bitmap and adjusts the tint:

L_INT AdjustBitmapTintExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */ 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   /* Rotate the A angle by –65 and the B angle by 20 */ 
   nRet = L_AdjustBitmapTint(&LeadBitmap, -6500, 2000, 0); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   //free bitmap 
   if (LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap); 
 
   return SUCCESS; 
}