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Diffstat (limited to 'Source/FreeImage/TIFFLogLuv.cpp')
| -rw-r--r-- | Source/FreeImage/TIFFLogLuv.cpp | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/Source/FreeImage/TIFFLogLuv.cpp b/Source/FreeImage/TIFFLogLuv.cpp new file mode 100644 index 0000000..124b25f --- /dev/null +++ b/Source/FreeImage/TIFFLogLuv.cpp @@ -0,0 +1,65 @@ +// ========================================================== +// XYZ to RGB TIFF conversion routines +// +// Design and implementation by +// - Hervé Drolon (drolon@infonie.fr) +// +// This file is part of FreeImage 3 +// +// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY +// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES +// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE +// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED +// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT +// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY +// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL +// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER +// THIS DISCLAIMER. +// +// Use at your own risk! +// ========================================================== + +#include "FreeImage.h" +#include "Utilities.h" + +void tiff_ConvertLineXYZToRGB(BYTE *target, BYTE *source, double stonits, int width_in_pixels) { + FIRGBF *rgbf = (FIRGBF*)target; + float *xyz = (float*)source; + + for (int cols = 0; cols < width_in_pixels; cols++) { + // assume CCIR-709 primaries (matrix from tif_luv.c) + // LOG Luv XYZ (D65) -> sRGB (CIE Illuminant E) + rgbf->red = (float)( 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]); + rgbf->green = (float)(-1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]); + rgbf->blue = (float)( 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]); + + /* + if (stonits != 0.0) { + rgbf->red = (float)(rgbf->red * stonits); + rgbf->green = (float)(rgbf->green * stonits); + rgbf->blue = (float)(rgbf->blue * stonits); + } + */ + + rgbf++; + xyz += 3; + } +} + +void tiff_ConvertLineRGBToXYZ(BYTE *target, BYTE *source, int width_in_pixels) { + FIRGBF *rgbf = (FIRGBF*)source; + float *xyz = (float*)target; + + for (int cols = 0; cols < width_in_pixels; cols++) { + // assume CCIR-709 primaries, whitepoint x = 1/3 y = 1/3 (D_E) + // "The LogLuv Encoding for Full Gamut, High Dynamic Range Images" <G.Ward> + // sRGB ( CIE Illuminant E ) -> LOG Luv XYZ (D65) + xyz[0] = (float)(0.497*rgbf->red + 0.339*rgbf->green + 0.164*rgbf->blue); + xyz[1] = (float)(0.256*rgbf->red + 0.678*rgbf->green + 0.066*rgbf->blue); + xyz[2] = (float)(0.023*rgbf->red + 0.113*rgbf->green + 0.864*rgbf->blue); + + rgbf++; + xyz += 3; + } +} + |