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Re: image display with different pixel size in x & y [message #46484 is a reply to message #46482]

Tue, 22 November 2005 23:20

peter.albert@gmx.de is currently offline

peter.albert@gmx.de
Messages: 108
Registered: July 2005

Senior Member

As David has said, the pixel size on your monitor can't of course be
changed, but instead you can mimick that by using a different number of
window pixels in x- and y-direction for each of your data pixels. If,
as an example, you have an array of 200 x 200 pixels, where the (data)
pixel y-size is 3 times its x-size, than I'd try plotting it all in a
200x600 sized window:

IDL> window, 1, xsize = 200, ysize = 600
IDL> tv, congrid(data, 200, 600)

or, more general:

IDL> ds = size(data, /dim)
IDL> x_factor = 2
IDL> y_factor = x_factor * 3
IDL> window, 1, $
IDL> xsize = ds[0] * x_factor, $
IDL> ysize = ds[1] * y_factor
IDL> tv, congrid(data, ds[0] * x_factor, ds[1] * y_factor)

Now, for the contours, I'd try calculating them from the CONGRIDded
data, allowing to overlay them easily over the plot.

Cheers,

Peter

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[Message index]

		Re: image display with different pixel size in x & y By: Jess on Wed, 23 November 2005 03:12
		Re: image display with different pixel size in x & y By: peter.albert@gmx.de on Tue, 22 November 2005 23:20
		Re: image display with different pixel size in x & y By: David Fanning on Tue, 22 November 2005 21:18

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