LBitmap::GrayScaleExt

#include "ltwrappr.h"

virtual L_INT LBitmap::GrayScaleExt(RedFact, GreenFact, BlueFact)

Converts any Bitmap to a gray scale bitmap without changing its resolution.

Returns

Comments

The summation (RedFact + GreenFact + BlueFact) must equal 1000. (Internally, the values are divided by 1000.)

For each pixel in the bitmap the red, green and blue values are modified by the RedFact, GreenFact and BlueFact parameters, respectively. This allows the user to give more weight to one color, essentially enhancing that color, before the pixel is converted to grayscale.

For example, if this function is called with the RedFact set to 500, the GreenFact set to 250 and the BlueFact set to 250, the red value of each pixel will get 50% of the weight when determining the grayscale value. The green value will get 25% of the weight and the blue value will get 25% of the weight when determining the grayscale value. This highlights or enhances the red in the bitmap, prior to conversion to grayscale.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.

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.

Required DLLs and Libraries

See Also

Example

L_INT ConvertToGray(LBitmap & Bitmap, L_TCHAR * szFileName)
{
   Bitmap.Load(szFileName);
   return Bitmap.GrayScaleExt(100, 300, 600);
}