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Add support for Fujifilm F-Log2 #20

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Add support for Fujifilm F-Log2 #20

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26 changes: 25 additions & 1 deletion utils/LogConvert.dctl
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@

*/

DEFINE_UI_PARAMS(curve, curve, DCTLUI_COMBO_BOX, 0, {acescc, acescct, arri_logc3, arri_logc4, blackmagic_filmgen5, canon_clog2, canon_clog3, dji_dlog, fujifilm_flog, gopro_protune, leica_llog, nikon_nlog, panasonic_vlog, red_log3g10, sony_slog2, sony_slog3, davinci_intermediate, filmlight_tlog, kodak_cineon}, {ACEScc, ACEScct, Arri LogC3, Arri LogC4, Blackmagic Film Gen5, Canon CLog2, Canon CLog3, DJI DLog, Fujifilm FLog, GoPro ProTune, Leica LLog, Nikon NLog, Panasonic VLog, Red Log3G10, Sony SLog2, Sony SLog3, DaVinci Intermediate, Filmlight TLog, Kodak Cineon})
DEFINE_UI_PARAMS(curve, curve, DCTLUI_COMBO_BOX, 0, {acescc, acescct, arri_logc3, arri_logc4, blackmagic_filmgen5, canon_clog2, canon_clog3, dji_dlog, fujifilm_flog, fujifilm_flog2, gopro_protune, leica_llog, nikon_nlog, panasonic_vlog, red_log3g10, sony_slog2, sony_slog3, davinci_intermediate, filmlight_tlog, kodak_cineon}, {ACEScc, ACEScct, Arri LogC3, Arri LogC4, Blackmagic Film Gen5, Canon CLog2, Canon CLog3, DJI DLog, Fujifilm FLog, Fujifilm FLog2, GoPro ProTune, Leica LLog, Nikon NLog, Panasonic VLog, Red Log3G10, Sony SLog2, Sony SLog3, DaVinci Intermediate, Filmlight TLog, Kodak Cineon})
DEFINE_UI_PARAMS(invert, invert, DCTLUI_CHECK_BOX, 0);


Expand Down Expand Up @@ -187,6 +187,26 @@ __DEVICE__ float oetf_fujifilm_flog(float x, int inv) {
}
}

__DEVICE__ float oetf_fujifilm_flog2(float x, int inv) {
/* Fujifilm F-Log2
https://dl.fujifilm-x.com/support/lut/F-Log2_DataSheet_E_Ver.1.0.pdf
*/
const float a = 5.555556f;
const float b = 0.064829f;
const float c = 0.245281f;
const float d = 0.384316f;
const float e = 8.799461f;
const float f = 0.092864f;
const float cut1 = 0.000889f;
const float cut2 = 0.100686685370811f;

if (inv == 1) {
return x < cut2 ? (x-f)/e : (_exp10f(((x - d)/c))/a - b/a);
} else {
return x < cut1 ? e*x+f : c*_log10f(a*x + b) + d;
}
}

__DEVICE__ float oetf_gopro_protune(float x, int inv) {
/* GoPro Protune Flat log curve
Unable to find whitepaper on this but it is described in this file from the original HPD opencolorio ACES config:
Expand Down Expand Up @@ -422,6 +442,10 @@ __DEVICE__ float3 transform(int p_Width, int p_Height, int p_X, int p_Y, float p
rgb.x = oetf_fujifilm_flog(rgb.x, invert);
rgb.y = oetf_fujifilm_flog(rgb.y, invert);
rgb.z = oetf_fujifilm_flog(rgb.z, invert);
} else if (curve == fujifilm_flog2) {
rgb.x = oetf_fujifilm_flog2(rgb.x, invert);
rgb.y = oetf_fujifilm_flog2(rgb.y, invert);
rgb.z = oetf_fujifilm_flog2(rgb.z, invert);
} else if (curve == gopro_protune) {
rgb.x = oetf_gopro_protune(rgb.x, invert);
rgb.y = oetf_gopro_protune(rgb.y, invert);
Expand Down