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Re: Plot Points over an image

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129166] Re: Plot Points over an image
  • From: "Alexey Popkov" <lehin.p at gmail.com>
  • Date: Wed, 19 Dec 2012 04:57:22 -0500 (EST)
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  • References: <kap6d7$46t$1@smc.vnet.net>

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 at gmail.com> wrote: news:kap6d7$46t$1 at 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 left-bottom, 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 20-25 first x-pixels of the image, and 
> the last 20-25 x-pixels 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
> 





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