https://community.intel.com/t5/Intel-Integrated-Performance/What-C4-mode-means/m-p/868713#M8639 There are _AC4 and _C4 mode methods, for example:<BR />ippiAdd_8u_AC4R_Sfs(...) and ippiAdd_8u_C4R_Sfs(...)<BR />Spec explains that _AC4 means 3color channels + 1 alpha channel, alpha channel is ignored by most of methods.<BR />I didn't find any explanation what_C4 means ? 3 color channels + 1 alpha channel but the alpha channel is processed as a regular color channel ?<BR /><BR /> Sun, 11 Jan 2009 07:33:39 GMT vladimir12345 2009-01-11T07:33:39Z https://community.intel.com/t5/Intel-Integrated-Performance/What-C4-mode-means/m-p/868713#M8639 There are _AC4 and _C4 mode methods, for example:<BR />ippiAdd_8u_AC4R_Sfs(...) and ippiAdd_8u_C4R_Sfs(...)<BR />Spec explains that _AC4 means 3color channels + 1 alpha channel, alpha channel is ignored by most of methods.<BR />I didn't find any explanation what_C4 means ? 3 color channels + 1 alpha channel but the alpha channel is processed as a regular color channel ?<BR /><BR /> Sun, 11 Jan 2009 07:33:39 GMT https://community.intel.com/t5/Intel-Integrated-Performance/What-C4-mode-means/m-p/868713#M8639 vladimir12345 2009-01-11T07:33:39Z https://community.intel.com/t5/Intel-Integrated-Performance/What-C4-mode-means/m-p/868714#M8640 <DIV style="margin:0px;">Hi,<BR /><BR />IPP functions with C4 mode will process all 4 channels without assumption that there might be an alpha channel.<BR /><BR />Regards,<BR /> Vladimir</DIV> <BR /> Sun, 11 Jan 2009 09:27:25 GMT https://community.intel.com/t5/Intel-Integrated-Performance/What-C4-mode-means/m-p/868714#M8640 Vladimir_Dudnik 2009-01-11T09:27:25Z