Re: surface plot of an image

*To*: mathgroup at smc.vnet.net*Subject*: [mg70921] Re: surface plot of an image*From*: bghiggins at ucdavis.edu*Date*: Wed, 1 Nov 2006 03:56:21 -0500 (EST)*References*: <ei4mb2$e2t$1@smc.vnet.net>

Ale, Suppose you have imported your grayscale image and it is called myimage. This should be an 2-D array of real numbers between 0 and 1. The function ListInterpolation takes a matrix of real numbers and then returns an InterpolationFunction that allows one to treat the image as a continuous function. myinterpolationImage=ListInterpolation[myimage] The output should look like InterpolatingFunction[{{1., 336.}, {1., 448.}}, <>] where the original image had dimensions (336 , 448) Now suppose we want to see how the image varies at some x value. Well we can plot myinterpolationImage for that x-value, say x=150 : Plot[myinterpolationImage[150, y], {y, 1, 448}, PlotStyle -> RGBColor[0, 0, 1]]; One can also get a 3D plot of myinterpolationImage over a selected range: Plot3D[myinterpolationImage[x, y], {x, 1, 300}, {y, 1, 400}, PlotPoints -> 50, Axes -> False, Boxed -> False, ViewPoint -> {0.801, -1.730, 2.796}]; Hope this helps Cheers Brian alemarabi at gmail.com wrote: > Hi, > > I have a microscopy image in gray levels and would like to convert it > to a surface plot, in order to visualize the differences in grey values > accros the picture. > Is there an easy (or already) existing way to do that? > Thank you in advance, > > Ale