| Incomplete ouput PNG files. [message #78710] |
Wed, 14 December 2011 07:33 |
lecacheux.alain
Messages: 325
Registered: January 2008
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Senior Member |
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I recently wanted to process a large number of data files in order to
produce the corresponding number of output image files, each in PNG
format. I choose to use NG graphics, since the sequence: "p =
image(some_data) & p.save('this_image.png') & p.close", appears pretty
well suitable for this purpose. No problem in coding the corresponding
IDL 8.1 project on my (Windows) workstation, and running it on a few
test files. Since the data files were stored on a remote (Windows)
server, I decided to run the project directly on the server, through a
remote connection from my workstation to the server, by using Terminal
Server. Still no problem: the job was running perfectly, and I could
remotely see each graphic window being open, then the corresponding
PNG file created, etc...
Now, to avoid any flashing on my screen, I just MINIMIZED the TS
window which was open on my workstation (no logout, no disconnect from
the remote server), the remote job continuing to run unattended.
Patatras ! From this point the PNG files were created but also harshly
truncated (basically reduced to a header and a void image).
I guess (but have not tested) that any other image file format would
have produced the same unsatisfying result.
A "true screen" seems then mandatory for having the "graphic.save"
function to work correctly: is it a bug of NG graphics or a feature?
Have some unix/linux people got same experience when using any X-
server in this way ?
alx.
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