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Thank you. I think you are right. But I think this ACTC is meant for blobs and not "Truecolor" format. But for "Truecolor" format using the matrix [0 0 0; 0.2 0 0; 0.4 0 0; 0.6 0 0; 0.8 0 0; 1 0 0] (and playing with it) is more sensible. Thank you. Sincerely, Abhinay D. Joshi On 12/5/06, Ged Ridgway <[log in to unmask]> wrote: > > Abhinay Joshi wrote: > > Could anyone please help me understand the term 'ACTC' which is > > colormap? what's does it excatly mean? > > See "doc colormap" in Matlab. Basically, colormaps decide how values > (such as t-values, MRI intensities, segmentation probabilities, etc.) > show up on your screen. > > The most common Matlab colormaps are jet (a kind of blueish-redish > spectrum, which gets its name from being originally developed for > fluid flow/jet visualisation; and its popularity from making dull > images look exciting ;-) ) and grey (higher values are brighter shades). > > actc appears to be Matthew Brett's "activation" colormap, see: > > http://imaging.mrc-cbu.cam.ac.uk/imaging/DisplaySlices > and > > http:[log in to unmask] > > as you can see from the first link, actc is a kind of blueish-redish > spectrum, probably developed with the same goal as jet (!) > > Personally, I don't like these exciting all-around-the-spectrum > colormaps (which have slightly blueish-green and slightly > reddish-yellow looking kind of similar(ish), but on different sides of > zero). I would prefer a simpler straight line through the colour > wheel, like cyan-black-red, but with so many list subscribers studying > perception/vision/psychology I wouldn't dare to claim that this would > look perceptually better... > > Yours, > Ged. > > P.S. It's lucky SPM5 is so slow, otherwise I'd never have time to > write all this... (just kidding) > -- Abhinay D.Joshi Nuclear Medical Center, UTSW. Phone:-214-648-9249. Cell:-817-995-3962.