https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829029#M5397 Thanks for your reply. I read that thread but.. <BR />Which I want to know is how to combine AlphaComp and AlphaPremul function.<BR /><BR />In AlphaComp function, there are alphaType parameter.<BR />What is difference of ippiAlphaOver value and ippiAlphaOverPremul values?<BR />Should I use AlphaPremul'ed buffer to pSrc1 or pSrc2?<BR /> Mon, 06 Sep 2010 06:57:44 GMT mleader1 2010-09-06T06:57:44Z https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829027#M5395 Hello,<BR /><BR />I'm trying to use AlphaComp function and AlphaPremul function to blend some images,<BR /><BR />but I can't understand the exact meaning and use of alphaType parameter in AlphaComp functions.<BR /><BR /><BR />There are image buffers A and B in 32bit RGBA and I used ippiAlphaPremul_8u_AC4IR function to buffer A.<BR /><BR />I want to composite A into B, so I think I should use ippiAlphaComp_8u_AC1R function to blend the image.<BR /><BR />Then how do I call this functions with alphaType parameter? (and other params too)<BR /><BR /><BR />Can I get some sample codes about this function?<BR /><BR />Thanks in advance, Mon, 06 Sep 2010 06:10:39 GMT https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829027#M5395 mleader1 2010-09-06T06:10:39Z https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829028#M5396 Could you please look into <A href="http://software.intel.com/en-us/forums/showthread.php?t=50136">this thread</A>. it seems that the similar question has been already answered there.<DIV>--Gennady</DIV> Mon, 06 Sep 2010 06:31:48 GMT https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829028#M5396 Gennady_F_Intel 2010-09-06T06:31:48Z https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829029#M5397 Thanks for your reply. I read that thread but.. <BR />Which I want to know is how to combine AlphaComp and AlphaPremul function.<BR /><BR />In AlphaComp function, there are alphaType parameter.<BR />What is difference of ippiAlphaOver value and ippiAlphaOverPremul values?<BR />Should I use AlphaPremul'ed buffer to pSrc1 or pSrc2?<BR /> Mon, 06 Sep 2010 06:57:44 GMT https://community.intel.com/t5/Intel-Integrated-Performance/How-alphaType-parameter-works-in-ippiAlphaComp-functions/m-p/829029#M5397 mleader1 2010-09-06T06:57:44Z