Displays the Remap Hue dialog box, and gets the options for LBitmap::RemapHue.


#include "ltwrappr.h"

virtual L_INT LDialogColor::DoModalRemapHue(hWndOwner)


HWND hWndOwner

Handle of the window which owns the dialog.


Value Meaning
SUCCESS_DLG_OK The "OK" button was pressed, and the dialog exited successfully.
SUCCESS_DLG_CANCEL The "Cancel" button was pressed, and the dialog exited successfully.
< 1 An error occurred. Refer to Return Codes.


LDialogColor::SetRemapHueParams must be called before using this function to set the initial values for the dialog. You can get the updated REMAPHUEDLGPARAMS with the values entered by the user through the dialog by using LDialogColor::GetRemapHueParams.

The Remap Hue dialog.

This dialog has the following fields:

Channel Drop-down list box:

Use this to select the channel to remap. There are three choices:

Curve Mode Drop-down list box:

Use this to select the curve mode to use when remapping. There are four choices:

Factor Edit box:

Use this to set the factor of the Exponential/Logarithm curve. Enter the value directly in the edit box or use the arrows to set the desired value.

Flip Buttons:

Use these buttons to flip the curve if the Curve Mode is either Curve or Linear. The following options are available:

Mask Multi-Slider:

Use the Mask Multi-slider Control to specify the range of values for which to apply the changes specified by the channel, the Curve mode and the factor. The first marker from the left is the minimum value of the range, and the second is the maximum value.

Reset Button:

Use the Reset button to set the curve of the current channel to the default values.

Reset All Button:

Use the Reset All button to set the curve for all the channels to default values.

Load Button:

Use the Load button to load an "*.lrh" file that contains Remap Hue curve settings, using the Load dialog. The loaded file will set a new curve for each channel.


Loading curve settings will overwrite all current settings for all channels!

Save Button:

Use the Save button to save all the curve settings for all the channels into an "*.lrh" file. This allows you set the same curve settings for other images by re-loading the file.

Required DLLs and Libraries

See Also




L_INT LDialogColor_DoModalRemapHueExample(LBitmap * pBitmap, HWND hWnd) 
   L_INT nRet; 
   LDialogColor DlgColor; 
   nRet = DlgColor.Initialize(DLG_INIT_COLOR ); 
   if(nRet != SUCCESS) 
      return nRet; 
   memset ( &DlgParams, 0, sizeof ( REMAPHUEDLGPARAMS ) ) ; 
   DlgParams.uStructSize = sizeof ( REMAPHUEDLGPARAMS ) ; 
   nRet = DlgColor.SetRemapHueParams(&DlgParams) ; 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = DlgColor.DoModalRemapHue(hWnd); 
   if(nRet < 1) 
      return nRet; 
   // Gets the updated values for the structure 
   nRet = DlgColor.GetRemapHueParams(&DlgParams, sizeof(DlgParams)) ; 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = DlgColor.Free(); 
   if(nRet != SUCCESS) 
      return nRet; 
   if ( NULL != DlgParams.puMaskLookup ) 
      GlobalFree ( DlgParams.puMaskLookup ) ; 
   if ( NULL != DlgParams.puHueLookup ) 
      GlobalFree ( DlgParams.puHueLookup ) ; 
   if ( NULL != DlgParams.puSaturationLookup ) 
      GlobalFree ( DlgParams.puSaturationLookup ) ; 
   if ( NULL != DlgParams.puValueLookup ) 
      GlobalFree ( DlgParams.puValueLookup ) ; 
   return nRet; 
Help Version 22.0.2023.2.3
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LEADTOOLS Common Dialog C++ Class Library Help

Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.