Enumeration GrayscaleTransformationMode

typedef enum GrayscaleTransformationMode
{
   /** Transforms to inverted grayscale. Recommended for light on dark images. */
   GTM_INVERTED = 0x01,
   /** Keeps the original grayscale. Recommended for dark on light images. */
   GTM_ORIGINAL = 0x02,
   /** Lets the library choose an algorithm automatically for grayscale transformation. */
   GTM_AUTO = 0x04,
   /**Placeholder value with no functional meaning. */
#if defined(_WIN32) || defined(_WIN64)
   GTM_END = 0xFFFFFFFF,
#else
   GTM_END = -1,
#endif
   /** Reserved setting for grayscale transformation mode. */
#if defined(_WIN32) || defined(_WIN64)
   GTM_REV = 0x80000000,
#else
   GTM_REV = -2147483648,
#endif
   /** Skips grayscale transformation. */
   GTM_SKIP = 0x00
}GrayscaleTransformationMode;