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Re: overimpose graphics on an imported image
*To*: mathgroup at smc.vnet.net
*Subject*: [mg106121] Re: [mg106104] overimpose graphics on an imported image
*From*: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
*Date*: Sat, 2 Jan 2010 05:04:14 -0500 (EST)
*References*: <201001011037.FAA05346@smc.vnet.net>
Hi,
tell Mathematica about your plotting-range:
img = Import["http://sipi.usc.edu/database/misc/5.1.12.tiff";];
{nx, ny} = ImageDimensions[img];
ImageCompose[img, {Graphics[{Red, Rectangle[{0, 0}, {nx/2, ny/2}]},
PlotRange -> {{0, nx}, {0, ny}}], 0.5}]
Cheers
Patrick
On Fri, 2010-01-01 at 05:37 -0500, alexxx.magni at gmail.com wrote:
> hi people,
> I wonder if it is just me being dumb, but I'm unable to perform what I
> thought was a very simple operation:
>
> having imported an image of (Lx,Ly) pixels, draw above it an empty
> rectangle at coordinates (x0,y0) (x1,y1) (say, lower left and upper
> right corners).
>
> Say for example that I want to overimpose on image i1 a rectangle
> covering a 10% portion, if I use this:
>
> ImageCompose[i1, Graphics[Rectangle[{0, 0}, {0.1*Lx, 0.1*Ly}]]]
>
> I have (apart from a filled rectangle instead of empty, but I can deal
> with it later)
> a huge rectangle covering all of it!
> How these coordinates interact?
>
> Thanks for any help...
>
>
> Alessandro Magni
>
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