The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Inactive » comp.soft-sys.math.mathematica

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Plot Points over an image
Replies: 2   Last Post: Dec 19, 2012 4:55 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]

Posts: 266
Registered: 6/14/08
Re: Plot Points over an image
Posted: Dec 19, 2012 4:55 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

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}]


<> wrote: news:kap6d7$46t$
> 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

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.