ColorBlend公式-技术博客集

ColorBlend公式
编程技术 / houtizong 发布于 3年前 81

The blend operation that occurs for each blend mode in Photoshop can be summed up in the following macros:

#defineChannelBlend_Normal(A,B)((uint8)(A))#defineChannelBlend_Lighten(A,B)((uint8)((B > A)? B:A))#defineChannelBlend_Darken(A,B)((uint8)((B > A)? A:B))#defineChannelBlend_Multiply(A,B)((uint8)((A * B)/255))#defineChannelBlend_Average(A,B)((uint8)((A + B)/2))#defineChannelBlend_Add(A,B)((uint8)(min(255,(A + B))))#defineChannelBlend_Subtract(A,B)((uint8)((A + B <255)?0:(A + B -255)))#defineChannelBlend_Difference(A,B)((uint8)(abs(A - B)))#defineChannelBlend_Negation(A,B)((uint8)(255- abs(255- A - B)))#defineChannelBlend_Screen(A,B)((uint8)(255-(((255- A)*(255- B))>>8)))#defineChannelBlend_Exclusion(A,B)((uint8)(A + B -2* A * B /255))#defineChannelBlend_Overlay(A,B)((uint8)((B <128)?(2* A * B /255):(255-2*(255- A)*(255- B)/255)))#defineChannelBlend_SoftLight(A,B)((uint8)((B <128)?(2*((A>>1)+64))*((float)B/255):(255-(2*(255-((A>>1)+64))*(float)(255-B)/255))))#defineChannelBlend_HardLight(A,B)(ChannelBlend_Overlay(B,A))#defineChannelBlend_ColorDodge(A,B)((uint8)((B ==255)? B:min(255,((A <<8)/(255- B)))))#defineChannelBlend_ColorBurn(A,B)((uint8)((B ==0)? B:max(0,(255-((255- A)<<8)/ B))))#defineChannelBlend_LinearDodge(A,B)(ChannelBlend_Add(A,B))#defineChannelBlend_LinearBurn(A,B)(ChannelBlend_Subtract(A,B))#defineChannelBlend_LinearLight(A,B)((uint8)(B <128)?ChannelBlend_LinearBurn(A,(2* B)):ChannelBlend_LinearDodge(A,(2*(B -128))))#defineChannelBlend_VividLight(A,B)((uint8)(B <128)?ChannelBlend_ColorBurn(A,(2* B)):ChannelBlend_ColorDodge(A,(2*(B -128))))#defineChannelBlend_PinLight(A,B)((uint8)(B <128)?ChannelBlend_Darken(A,(2* B)):ChannelBlend_Lighten(A,(2*(B -128))))#defineChannelBlend_HardMix(A,B)((uint8)((ChannelBlend_VividLight(A,B)<128)?0:255))#defineChannelBlend_Reflect(A,B)((uint8)((B ==255)? B:min(255,(A * A /(255- B)))))#defineChannelBlend_Glow(A,B)(ChannelBlend_Reflect(B,A))#defineChannelBlend_Phoenix(A,B)((uint8)(min(A,B)- max(A,B)+255))#defineChannelBlend_Alpha(A,B,O)((uint8)(O * A +(1- O)* B))#defineChannelBlend_AlphaF(A,B,F,O)(ChannelBlend_Alpha(F(A,B),A,O))

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<div style="font-size: 14px;" > The blend operation that occurs for each blend mode in Photoshop can be summed up in the following macros: <div style="line-height: 28px; font-family: 'Hiragino Sans GB W3', 'Hiragino Sans GB', Arial, Helvetica, simsun, 宋体; font-size: 16px;"> <pre class="lang-c prettyprint prettyprinted"><code style="line-height: 24px; margin: 0px; padding: 0px; border: 0px; vertical-align: baseline; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif;">#defineChannelBlend_Normal(A,B)((uint8)(A))#defineChannelBlend_Lighten(A,B)((uint8)((B &gt; A)? B:A))#defineChannelBlend_Darken(A,B)((uint8)((B &gt; A)? A:B))#defineChannelBlend_Multiply(A,B)((uint8)((A * B)/255))#defineChannelBlend_Average(A,B)((uint8)((A + B)/2))#defineChannelBlend_Add(A,B)((uint8)(min(255,(A + B))))#defineChannelBlend_Subtract(A,B)((uint8)((A + B &lt;255)?0:(A + B -255)))#defineChannelBlend_Difference(A,B)((uint8)(abs(A - B)))#defineChannelBlend_Negation(A,B)((uint8)(255- abs(255- A - B)))#defineChannelBlend_Screen(A,B)((uint8)(255-(((255- A)*(255- B))&gt;&gt;8)))#defineChannelBlend_Exclusion(A,B)((uint8)(A + B -2* A * B /255))#defineChannelBlend_Overlay(A,B)((uint8)((B &lt;128)?(2* A * B /255):(255-2*(255- A)*(255- B)/255)))#defineChannelBlend_SoftLight(A,B)((uint8)((B &lt;128)?(2*((A&gt;&gt;1)+64))*((float)B/255):(255-(2*(255-((A&gt;&gt;1)+64))*(float)(255-B)/255))))#defineChannelBlend_HardLight(A,B)(ChannelBlend_Overlay(B,A))#defineChannelBlend_ColorDodge(A,B)((uint8)((B ==255)? B:min(255,((A &lt;&lt;8)/(255- B)))))#defineChannelBlend_ColorBurn(A,B)((uint8)((B ==0)? B:max(0,(255-((255- A)&lt;&lt;8)/ B))))#defineChannelBlend_LinearDodge(A,B)(ChannelBlend_Add(A,B))#defineChannelBlend_LinearBurn(A,B)(ChannelBlend_Subtract(A,B))#defineChannelBlend_LinearLight(A,B)((uint8)(B &lt;128)?ChannelBlend_LinearBurn(A,(2* B)):ChannelBlend_LinearDodge(A,(2*(B -128))))#defineChannelBlend_VividLight(A,B)((uint8)(B &lt;128)?ChannelBlend_ColorBurn(A,(2* B)):ChannelBlend_ColorDodge(A,(2*(B -128))))#defineChannelBlend_PinLight(A,B)((uint8)(B &lt;128)?ChannelBlend_Darken(A,(2* B)):ChannelBlend_Lighten(A,(2*(B -128))))#defineChannelBlend_HardMix(A,B)((uint8)((ChannelBlend_VividLight(A,B)&lt;128)?0:255))#defineChannelBlend_Reflect(A,B)((uint8)((B ==255)? B:min(255,(A * A /(255- B)))))#defineChannelBlend_Glow(A,B)(ChannelBlend_Reflect(B,A))#defineChannelBlend_Phoenix(A,B)((uint8)(min(A,B)- max(A,B)+255))#defineChannelBlend_Alpha(A,B,O)((uint8)(O * A +(1- O)* B))#defineChannelBlend_AlphaF(A,B,F,O)(ChannelBlend_Alpha(F(A,B),A,O))</code></pre> </div>

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