| Re: Incomplete ouput PNG files. [message #78694 is a reply to message #78691] |
Thu, 15 December 2011 06:23   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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alx writes:
> I agree. RESOLUTION keyword is a solution, but the (true or implicit)
> window size also plays some role. For an original image of size
> 2224x1124 and PNG output(from p=image(DIMENSIONS=...) &
> p.save,BUFFER=...,RESOLUTION=...), I find:
> BUFFER=1, RESOLUTION=96, DIMENSIONS=[800,600] -> FILE SIZE = 99 kB
> BUFFER=1, RESOLUTION=300, DIMENSIONS=[800,600] -> FILE_SIZE = 290
> kB
> BUFFER=1, RESOLUTION=600, DIMENSIONS=[800,600] -> FILE SIZE = 488
> kB
> BUFFER=1, RESOLUTION=600, DIMENSIONS=[640,512] -> FILE SIZE = 423
> kB
> BUFFER=1, RESOLUTION=600, DIMENSIONS=[1024,768] -> FILE_SIZE = 602
> kB
> BUFFER=0, RESOLUTION=600, DIMENSIONS=[640,512] -> FILE SIZE = 423
> kB
> BUFFER=0, RESOLUTION=600, DIMENSIONS=[800,600] -> FILE SIZE = 408
> kB
> BUFFER=0, RESOLUTION=600, DIMENSIONS=[1024,768] -> FILE_SIZE = 602
> kB
> Note the (strange ?) difference between BUFFER=0 and 1 for
> DIMENSIONS=[800,600]
Yes, I'm confused about just what "resolution" means in
this context. Even more confusing is why Coyote Graphics
files seem to be smaller in overall file size, while
consistently larger in image dimensions. I'm guessing
"resolution" must be one of those things that is in the
eye of the beholder. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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