Gain高光增益

輸出RGB值=（輸入RGB值)* Gain值

rgb * gain

Offset偏移?

輸出RGB值= 輸入RGB值+Offset值

rgb + offset

Lift 暗部

輸出RGB值=輸入RGB值* (1-Lift值)+Lift值

rgb * (1 - lift) + lift

Gamma 中灰

輸出RGB值=輸入RGB值^(1/Gamma值)

powf(rgb, (1 / gamma)

Contrast 非S彎線性對比度

輸出RGB值=（輸入RGB值-軸心值pivot)*Contrast 值+軸心值pivot

（rgb-pivot）*contrast+ Contrast

// lift gamma gain offset DCTL代碼

DEFINE_UI_PARAMS(offset, Offset, DCTLUI_SLIDER_FLOAT, 0.0, -1.0, 1.0, 0.1)

DEFINE_UI_PARAMS(lift, Lift, DCTLUI_SLIDER_FLOAT, 0.0, -1.0, 1.0, 0.1)

DEFINE_UI_PARAMS(gamma, Gamma, DCTLUI_SLIDER_FLOAT, 1.0, 0.0, 2.0, 0.1)

DEFINE_UI_PARAMS(gain, Gain, DCTLUI_SLIDER_FLOAT, 1.0, 0.0, 2.0, 0.1)

__DEVICE__ float3 transform(int p_Width, int p_Height, int p_X, int p_Y, float p_R, float p_G, float p_B)

{

float3 rgb = make_float3(p_R, p_G, p_B);

rgb = make_float3(_powf(rgb.x, (1 / gamma)), _powf(rgb.y, (1 / gamma)), _powf(rgb.z, (1 / gamma)));

rgb = make_float3(rgb.x * (1 - lift) + lift, rgb.y * (1 - lift) + lift, rgb.z * (1 - lift) + lift);

rgb = make_float3(rgb.x * gain, rgb.y * gain, rgb.z * gain);

rgb = make_float3(rgb.x + offset, rgb.y + offset, rgb.z + offset);

return rgb;

}

文本編輯器保存為dctl后綴 放入達芬奇lut文件夾即可打開