L_HSVtoRGB - Raster Imaging C API Help

L_HSVtoRGB

#include "l_bitmap.h"

L_LTDIS_API L_COLORREF L_HSVtoRGB(hsvColor)

HSVREF hsvColor;

HSV input value

Returns a COLORREF value that is an equivalent representation of the specified HSV value.

Parameter

Description

hsvColor

The HSV input value.

Returns

An L_COLORREF that contains the RGB equivalent of the specified HSV value.

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.

The HSV value is the Hue ,Saturation, Value color space. Traditionally, hue ranges from 0 to 359. However, the hue component of the HSVREF is represented by an unsigned byte. Therefore, the range of 0 to 359 is remapped to a range of 0..255. For example,

Color

Hue(0..359)

Hue(0..255)

Red

0

0

Green

120

85

Blue

240

170

Saturation ranges from 0 to 255 where 0 means the highest amount of white and 255 means no white.

Value ranges from 0 to 255 where 0 means highest amount of black and 255 means no black.

Required DLLs and Libraries

LTDIS

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.

See Also

Functions:

L_RemapBitmapHue, L_SetBitmapRgnColorHSVRange, L_SetBitmapRgnColorRGBRange, L_RGBtoHSV, L_SetBitmapRgnEllipse, L_SetBitmapRgnPolygon, L_SetBitmapRgnRect, L_SetBitmapRgnRoundRect

Topics:

Raster Image Functions: Creating and Using a Region

 

Raster Image Functions: Doing Color Space Conversion

 

Working with an Existing Bitmap Region

 

Changing Brightness and Contrast

 

Raster Image Functions: Changing Brightness and Contrast

 

Using Color Values in LEADTOOLS

Example

//This example takes displays the H,S,V value of a HSVREF 
//and the equivalent RGB components 
L_INT HSVtoRGBExample(HSVREF hsvColor) 
{ 
   L_TCHAR  szMsg[100]; 
   COLORREF cr; 
 
   wsprintf(szMsg, TEXT("Hue[%d] Saturation[%d] Value[%d]\n"), hsvColor.uH, hsvColor.uS, hsvColor.uV); 
   MessageBox(NULL, szMsg, TEXT(""), MB_OK); 
 
   cr = L_HSVtoRGB(hsvColor); 
 
   wsprintf(szMsg, TEXT("R[%d] G[%d] B[%d]\n"), GetRValue(cr), GetBValue(cr), GetGValue(cr)); 
   MessageBox(NULL, szMsg, TEXT(""), MB_OK); 
   return SUCCESS; 
} 
Help Version 20.0.2018.7.30
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LEADTOOLS Raster Imaging C API Help