HLSToRGB

Convert from HLS to RGB

Supported Technologies

MT

Synopsis

FwStatus   fwiHLSToRGB_8u_C3R ( const Fw8u * pSrc, int srcStep, Fw8u * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_8u_AC4R ( const Fw8u * pSrc, int srcStep, Fw8u * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_16u_C3R ( const Fw16u * pSrc, int srcStep, Fw16u * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_16u_AC4R ( const Fw16u * pSrc, int srcStep, Fw16u * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_16s_C3R ( const Fw16s * pSrc, int srcStep, Fw16s * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_16s_AC4R ( const Fw16s * pSrc, int srcStep, Fw16s * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_32f_C3R ( const Fw32f * pSrc, int srcStep, Fw32f * pDst, int dstStep, FwiSize roiSize );
FwStatus   fwiHLSToRGB_32f_AC4R ( const Fw32f * pSrc, int srcStep, Fw32f * pDst, int dstStep, FwiSize roiSize );

Parameters

dstStep   Destination buffer step size (width of the buffer in bytes).
pDst   Pointer to a location in a destination buffer.
pSrc   Pointer to a location in a source buffer.
roiSize   Specifies the height and width of an ROI.
srcStep   Source buffer step size (width of the buffer in bytes).

Description

These functions step through an ROI in a source buffer, convert the source data from the HLS color space to the RGB color model, and write the converted data to a destination buffer.

An HLS image (pSrc) declared in the ROI is converted to a gamma-corrected RGB image (pDst) as follows. 

if ( L <= 0.5)
 M2 = L * (1+S)
else
 M2 = L + S - L*S
 M1 = 2*L - M2
if (S == 0)
 R = G = B = L
else
{
 h = H + 120
 if (h > 360)
  h = h - 360
 if (h < 60)
  R = (M1 + (M2 - M1)*h/60)
 else if (h < 180)
  R = M2
 else if (h < 240)
  R = M1 + (M2 - M1)*(240 - h)/60
 else
  R = M1
 h = H
 if (h < 60)
  G = (M1 + (M2 - M1)*h/60)
 else if (h < 180)
  G = M2
 else if (h < 240)
  G = M1 + (M2 - M1)*(240 - h)/60
 else
  G = M1
 h = H - 120
 if (h < 60)
  B = (M1 + (M2 - M1)*h/60)
 else if (h < 180)
  B = M2
 else if (h < 240)
  B = M1 + (M2 - M1)*(240 - h)/60
 else
  B = M1
}

The formulas assume that H, L, and S values are in the range [0 to 1].
For integer destination data type, the values are scaled to the full range of the data type.