我怎樣才能爲WPF實現漂白旁路着色器效果？

Question

我怎樣才能實現WPF的bleach bypass着色器效果？
我也有興趣實施前兩個Tehnicolor Film Processes，或任何可能會導致舊影片外觀的變化。

Answer 1

退房：http://developer.download.nvidia.com/shaderlibrary/packages/post_bleach_bypass.fx.zip

最重要的部分是：

float4 bypassPS(QuadVertexOutput IN, uniform sampler2D SceneSampler) : COLOR 
{ 
    float4 base = tex2D(SceneSampler, IN.UV); 
    float3 lumCoeff = float3(0.25,0.65,0.1); 
    float lum = dot(lumCoeff,base.rgb); 
    float3 blend = lum.rrr; 
    float L = min(1,max(0,10*(lum- 0.45))); 
    float3 result1 = 2.0f * base.rgb * blend; 
    float3 result2 = 1.0f - 2.0f*(1.0f-blend)*(1.0f-base.rgb); 
    float3 newColor = lerp(result1,result2,L); 
    float A2 = Opacity * base.a; 
    float3 mixRGB = A2 * newColor.rgb; 
    mixRGB += ((1.0f-A2) * base.rgb); 
    return float4(mixRGB,base.a); 
}