L_ChangeHueSatIntBitmap

#include "l_bitmap.h"

L_LTIMGCLR_API L_INT L_ChangeHueSatIntBitmap(pBitmap, nHue, nSaturation, nIntensity, pHsiData, uHsiDataCount, uFlags)

Changes the hue, saturation and brightness of all or specified colors in the image.

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap on which to apply the effect.

L_INT nHue

Angular amount to change the hue, in hundredths of degrees. Valid values range from 18000 through 18000. This value is divided internally by 100.

L_INT nSaturation

Percentage amount to change saturation, in tenths of percent. Valid values range from 1000 through 1000. This value is divided internally by 10. Negative values decrease the saturation of colors. Positive values increase the saturation. The saturation level is increased or decreased by a percentage of its present saturation level. For example, an increase of 20% of the current saturation level "L" will raise the new saturation level "L1" to a value L = 0.20 * L. Likewise, increasing the saturation level 100% doubles the saturation level (L1 = L + 1.0 * L). Decreasing the saturation level 100% will set the new saturation level to 0. This process is carried out for every pixel. The saturation is set to 1000 (maximum value) if the new value exceeds 1000).

L_INT nIntensity

Percentage amount to change the intensity , in tenths of percent. Valid values range from 1000 (black) through 1000 (white). This value is divided internally by 10. Positive values increase (or lighten) the brightness of the bitmap image. Negative values decrease (or darken) the brightness of the bitmap image.

pHSIDATA pHsiData

Pointer to array of HSIDATA structures for each color range to be changed.

L_UINT uHsiDataCount

Count of structures in the pHsiData array.

L_UINT32 uFlags

Reserved for future use. Must be 0.

Returns

Comments

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 combines the basic functionality found in the L_ChangeBitmapHue, L_ChangeBitmapSaturation, and L_ChangeBitmapIntensity functions. In addition, special options can be specified in the LPHSIDATA structure.

The pHsiData->uStructSize must be set to sizeof(HSIDATA) before calling this function. For an array of structures, only the first structure in the array needs to have uStructSize member set.

To change the overall hue, saturation and intensity all at one time, pass NULL for the pHsiData and 0 for the uHsiDataCount in the main function. To adjust the parameters separately, or to make adjustments in successive passes, use the structures and pass 0 for the nHue, nSaturation, and nIntensity parameters in the main function.

For detailed information about using the ranges in the HSIDATA structure, refer to HSIDATA.

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 in the Document and Medical Imaging toolkits.

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

• 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, Linux.

L_INT ChangeHueSatIntBitmapExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
   HSIDATA          HsiData;          /*Color Range Information structure*/ 
 
   /* Load a bitmap at 24 bits per pixel  */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\Image1.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL);  
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /*Change bitmap hue, saturation, and brightness */ 
   HsiData.uStructSize  = sizeof(HSIDATA); 
   HsiData.nHue            =18000; 
   HsiData.nSaturation   = 0; 
   HsiData. nIntensity     = 0; 
   HsiData.nOuterLow   =315; 
   HsiData.nOuterHigh  = 45; 
   HsiData.nInnerLow    = 345;  
   HsiData.nInnerHigh   = 15; 
   /* change the red color to green */ 
   nRet = L_ChangeHueSatIntBitmap (&LeadBitmap, 0, 0, 0, &HsiData, 1, 0); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   //free bitmap  
   if(LeadBitmap.Flags.Allocated)   
      L_FreeBitmap(&LeadBitmap);   
   return SUCCESS; 
}