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Re: How to directly write figure to png without open x-window in IDL5.4? [message #32837 is a reply to message #32834]

Wed, 13 November 2002 20:24

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

David Fanning <david@dfanning.com> writes:

> Ninghai Sun (ninghai@whidc.com) writes:
>
>> Now, I first write to PS and then convert to png in cronjob. No
>> problem in linux. But if logout of Linux when the idl code is running,
>> always get error that no x-window is opened. Any idea how to figure it
>> out?
>
> Use the Z-buffer for a window.
>
> thisDevice = !D.Name
> Set_Plot, 'Z'
> LOADCT, 5 ; of whatever you do to load colors
> TVLCT, r, g, b, /GET
> Device, Z_Buffer=0, Set_Resolution=[400, 300] ; or whatever
> TV, image ; Or, whatever graphics you display
> snapshot = TVRD()
> Set_Plot, thisDevice
> Write_PNG, 'myfile.png, snapshot, r, g, b

Speaking of being stuck in IDL 5.4, I have found that TVRD() and
WRITE_PNG have two slightly different behaviors, depending on whether
IDL 5.4 (or earlier), or 5.5 are used. In the earlier versions, the
graphic is vertically flipped. In my little Z buffer PNG screen
capture code, I have something like this to test for IDL version:

img = tvrd()
if float(!version.release) LT 5.5 then $
img = reverse(img, 2)

write_png, filename, img, ctab, ctab, ctab

Craig

--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: How to directly write figure to png without open x-window in IDL5.4? By: ninghai on Thu, 14 November 2002 06:47
		Re: How to directly write figure to png without open x-window in IDL5.4? By: Craig Markwardt on Wed, 13 November 2002 20:24
		Re: How to directly write figure to png without open x-window in IDL5.4? By: David Fanning on Wed, 13 November 2002 13:38

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