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LBitmap::ChangeHue

Summary

Changes the hue of colors in the class object's bitmap by rotating the color wheel.

Syntax

#include "ltwrappr.h"

virtual L_INT LBitmap::ChangeHue(nAngle, uFlags = 0)

Parameters

L_INT nAngle

Angular amount to change the hue, in degrees.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

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

Comments

This function can rotate the color wheel in either direction. 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.

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

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.

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.

Change Hue Function - Before

Change Hue Function - After

View additional platform support for this Change Hue function.

Required DLLs and Libraries

LTDIS
LTFIL
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.

Example

L_INT LBitmap__ChangeHueExample() 
{ 
   L_INT nRet; 
   LBitmap m_Bitmap; 
    
   nRet =m_Bitmap.Load(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image1.jpg")), 0,ORDER_BGR); 
   if(nRet !=SUCCESS) 
      return nRet; 
   // change each color to complement 
   nRet =m_Bitmap.ChangeHue(180); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}