1: kernel SaturationKernel : ImageComputationKernel<ePixelWise>
2: {
3: Image<eRead, eAccessPoint> src; // 인풋 이미지를 src 변수명으로 만든다.
4: Image<eWrite> dst; // 아웃풋 이미지를 dst 변수명으로 만든다.
5: param: //옵션.
6: float saturation;
7:
8: local: //로컬변수선언
9: float3 coefficients; // This local variable is not exposed to the user.
10:
11: // In define(), parameters can be given labels and default values.
12: void define() {
13: defineParam(saturation, "Saturation", 1.2f);
14: }
15:
16: // The init() function is run before any calls to process().
17: // Local variables can be initialized here.
18: void init() {
19: // Initialise coefficients according to rec. 709 standard.
20: coefficients.x = 0.2126f;
21: coefficients.y = 0.7152f;
22: coefficients.z = 0.0722f;
23: }
24:
25: void process() {
26: // Read the input image
27: SampleType(src) input = src();
28:
29: // Isolate the RGB components
30: float3 srcPixel(input.x, input.y, input.z);
31:
32: // Calculate luma
33: float luma = srcPixel.x * coefficients.x
34: + srcPixel.y * coefficients.y
35: + srcPixel.z * coefficients.z;
36: // Apply saturation
37: float3 saturatedPixel = (srcPixel - luma) * saturation + luma;
38:
39: // Write the result to the output image
40: dst() = float4(saturatedPixel.x, saturatedPixel.y, saturatedPixel.z, input.w);
41: }
42: };
