L_LTIMGCLR_API L_INT L_AdjustBitmapTint(pBitmap, nAngleA, nAngleB, uFlags)
Adjusts the bitmap tint by changing the colors in an image by using two separate color wheel rotations.
Pointer to the bitmap handle that references the bitmap to which to apply the effect.
Value that represents the amount of change in the A angle, in hundredths of degrees. Valid values range between -18000 and 18000.
Value that represents the amount of change in the B angle, in hundredths of degrees. Valid values range between -18000 and 18000.
Reserved for future use. Must be 0.
|SUCCESS||The function was successful.|
|< 1||An error occurred. Refer to Return Codes.|
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:
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.
Required DLLs and Libraries
Win32, x64, Linux.
The following example loads a bitmap and adjusts the tint:
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);
/* Rotate the A angle by –65 and the B angle by 20 */
nRet = L_AdjustBitmapTint(&LeadBitmap, -6500, 2000 , 0);
nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
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