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MathGroup Archive 2007

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Re: image opacity/image overlaying?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg80377] Re: image opacity/image overlaying?
  • From: AV <akvelu at gmail.com>
  • Date: Mon, 20 Aug 2007 03:41:58 -0400 (EDT)
  • References: <f9p5ut$rm2$1@smc.vnet.net><200708141058.GAA08636@smc.vnet.net>

Thanks for the suggestion.  It was helpful and does give the effect i
was looking for.

AV

On Aug 15, 3:09 am, Murray Eisenberg <mur... at math.umass.edu> wrote:
> And one can show a nice "fade" transitional effect with:
>
>    Manipulate[
>      Show[{
>        Graphics[{Opacity[1-c],img1[[1]]}],
>        Graphics[{Opacity[c],img2[[1]]}]
>      }],{c,0.01,1}
>    ]
>
>
>
> Mariusz Jankowski wrote:
> > This doesn't use ArrayPlot, but works for 2D image arrays. Given two images,
> > for example,
>
> > img1 = Import[
> >   "http://www.ee.usm.maine.edu/courses/ele489/data/cameraman.tif"; ] ;
>
> > img2 = Import[
> >   "http://www.ee.usm.maine.edu/courses/ele489/data/face.tif"; ] ;
>
> > then this gives the desired result
>
> > Show[{img1, Graphics[{Opacity[0.5], img2[[1]]}] }]
>
> > Bye, Mariusz
>
> >>>> On 8/13/2007 at 4:49 AM, in message <f9p5ut$rm... at smc.vnet.net>,
> > AV<akv... at gmail.com> wrote:
> >> Is there a way of overlaying a partially transparent 2D image array on
> >> another 2D image array using ArrayPlot or ListDensityPlot?  I am
> >> currently using a workaround by making an array of transparent points
> >> and showing this on top of a ListDensityPlot graphics but I wanted to
> >> check if there was a better way since this is very slow.
>
> >> AV
>
> --
> Murray Eisenberg                     mur... at math.umass.edu
> Mathematics & Statistics Dept.
> Lederle Graduate Research Tower      phone 413 549-1020 (H)
> University of Massachusetts                413 545-2859 (W)
> 710 North Pleasant Street            fax   413 545-1801
> Amherst, MA 01003-9305




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