https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815245#M4231 Hello, may be you can try ippiXor function for that purpose?<BR /><BR />Vladimir Thu, 27 Jan 2011 10:08:10 GMT Vladimir_Dudnik 2011-01-27T10:08:10Z https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815244#M4230 Hello, I have a mask image which contains 1s and 0s, I want to invert, namely apply a bitwise NOT operation, but ippiNot just subtracts values from 255, this is not what I need. Also I tried ippiThreshold_LTValGTVal with values <BR />const Ipp8u threshLT[] = {1,1,1};<BR />const Ipp8u valueLT[] = {1,1,1};<BR />const Ipp8u threshGT[] = {0,0,0};<BR />const Ipp8u valueGT[] = {0,0,0};<BR />ippiThreshold_LTValGTVal_8u_C3R(roiMaskC3, 3*srcWidth, roiMaskNotC3, 3*srcWidth, roiSize, threshLT, valueLT, threshGT, valueGT);<BR /><BR />but I get a weird result, filled with repeating quadruple values of 13 240 173 186...<BR />Would you please suggest a solution? Thu, 27 Jan 2011 09:33:23 GMT https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815244#M4230 Kadir_Kirtac 2011-01-27T09:33:23Z https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815245#M4231 Hello, may be you can try ippiXor function for that purpose?<BR /><BR />Vladimir Thu, 27 Jan 2011 10:08:10 GMT https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815245#M4231 Vladimir_Dudnik 2011-01-27T10:08:10Z https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815246#M4232 hello, its ok Thank you, I have XoRed the mask with an array of 1s in the same size with source, than I get the inverted result. Thu, 27 Jan 2011 10:45:53 GMT https://community.intel.com/t5/Intel-Integrated-Performance/how-to-invert-mask-values/m-p/815246#M4232 Kadir_Kirtac 2011-01-27T10:45:53Z