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Re: Using a jpg picture for a 2D plot background

  • To: mathgroup at smc.vnet.net
  • Subject: [mg99005] Re: Using a jpg picture for a 2D plot background
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Fri, 24 Apr 2009 03:44:03 -0400 (EDT)
  • References: <gspgk7$nro$1@smc.vnet.net>

In 7 this could be done easily with ImageCompose, but since you've got
6 this is less trivial. One approach would be:

bg = ExampleData[{"TestImage", "Peppers"}]
pl = Plot[Sin[x], {x, -\[Pi], \[Pi]}];
t = RescalingTransform[{{1, 512}, {1, 512}}, {{-\[Pi], \[Pi]}, {-1,
     1}}];
bg2 = GeometricTransformation[bg[[1]], t] // Graphics;
Show[bg2, pl, AspectRatio -> 1, Frame -> True,
 BaseStyle -> {Thickness[0.02]}]

There is a difference between imported pictures in 6 and 7. Whereas in
6 they're Graphics in 7 they're an Image. To have this example work in
7 one line should be different:

 bg2 = GeometricTransformation[Rasterize[bg][[1]], t] // Graphics;

The 512 in the above code is the size of the image (both vertical and
horizontal). In 7 you could use ImageDimensions to get this
information. In 6 this can be gotten using either bg[[3]] or

AbsoluteOptions[bg, PlotRange]

Use the correct AspectRatio for the picture, otherwise it'll look
distorted.

Hope this helps.

Cheers -- Sjoerd


On Apr 23, 12:41 pm, Bill <WDWNORW... at aol.com> wrote:
> Hi:
>
> I would like to use a jpg picture as a background for a 2D plot in Mathem=
atica 6.0.1, on a PC using Win XP.
> I'm not sure if this can be done. If this can be done, can someone please=
 give me the code to do this?
>
> Thanks,
>
> WDW



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