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Alexey
Posts:
266
Registered:
6/14/08


Re: Plot Points over an image
Posted:
Dec 19, 2012 4:55 AM


Hi Pablo,
On my machine your code gives expected result with random image:
image = Image[RandomReal[1, {640, 640, 3}]]; ImageCompose[image, {Graphics[{PointSize[.009], Black, Point[{0, 0}]}], .6}, {635, 600}]
Alexey
<lopez.matencio@gmail.com> wrote: news:kap6d7$46t$1@smc.vnet.net... > Hello, > > I have a TIFF image of 640x640 pixels, over which I would like to plot a > list of points or disks with small radius. > I have been testing different alternatives and I found ImageCompose > command. > > ImageCompose[image, {Graphics[{PointSize[.009], Black, Point[{0, 0}]} > ], .6}, {600, 600}] > > This place a point at pixels {600,600} from leftbottom, but if I set a > point close to e.g. right edge of the image {635,600} the point is into > the frame bat there is not image at background. Namely, the image does not > show all the pixels. First, let say 2025 first xpixels of the image, and > the last 2025 xpixels of the image are invisibles. > > When I tick the image it shows the image at the center of the frame and > two blank vertical spaces at right and left of the image. > > Two questions: >  There exist any option or command I could use to show the full image, > i.e. the 640 x 640 pixels? >  How could I display over imposed a list of points (e.g. 40 points) at > pixel coordinates and all on the same image. > > Thank you very much for your help and time. > > Pablo >



