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2014-07-17 19:11:24 -0500 | commented question | CIE Lab conversion error Thanks for looking at this problem. I must be doing something wrong with the code. cv::Mat tmp(1,1,CV_32FC3); Vec3f* pRow = tmp.ptr<Vec3f>(0); for(int k = 0; k < 3; k++) pRow[0].val[k] = (float) 0.5; cvtColor(tmp,tmp,CV_BGR2Lab) I think I will make a very small project which does this with the vanilla deployment of OpenCV |

2014-07-16 17:26:24 -0500 | answered a question | L*u*v* and L*a*b* Color Space are Non-Euclidean in 8U Yes. However in Lab, the scaling for a and b are the same, differing only by an offset, which is removed if you take the difference using only "a" and "b". So if you wanted to check to see if the color was similar looking, and not worry about the "L" component, then you could just form a norm on the "a" and the "b" parts. Myself I just use the floating point version, which is left alone. |

2014-07-16 17:20:00 -0500 | asked a question | CIE Lab conversion error I am converting a cv::Mat(1,1,CV_32FC3) matrix using cvtColor and CV_BGR2Lab. The answer I get back does not conform to the formula given in the documentation, but does at points. So I am baffled as to what I am doing wrong. I can hardly believe this is wrong in OpenCV. It However all in between colors seem wrong. For example, gray (128/255 128/255 128/255), or approximately 0.5020 for each entry, gives me Lab = (53.5850 0 0), when it should return the value (76.1895 0 0). I have plotted the entire range of gray and see that cube root part of Open CV's implementation seems to be missing. |

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