| Re: IMDISP and writing to Postscript [message #65872] |
Sun, 29 March 2009 04:55  |
Jeremy Bailin
Messages: 618
Registered: April 2008
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Senior Member |
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On Mar 28, 5:24 pm, ed.schm...@gmail.com wrote:
> On Mar 27, 9:03 am, Brian Larsen <balar...@gmail.com> wrote:> Right I have learned that Preview.app lesson that hard way on more
>> than one occasion. The ps file is fine is the pdf that is no good
>> that you are really viewing.
>
>> Instead of illustrator I find the easiest solution to use Acrobat
>> Distiller, I have it set as the default application for ps/eps files.
>
> Emily,
>
> Two other ways of viewing .ps files under OSX are the Gimp and
> Photoshop Elements. I tried both of these with your 5x5 idl.ps file,
> and both of them display the image without any smoothing.
>
> Ed Schmahl
>
>> Double-click and it makes pdfs that look great. Of course you have to
>> have acrobat pro to have this but if you do its a great solution.
>
>> Brian
>
>> ------------------------------------------------------------ --------------
>> Brian Larsen
>> Boston University
>> Center for Space Physicshttp://people.bu.edu/balarsen/Home/IDL
>
>
And there's always ghostview! Still the fastest way of looking at a ps
file that I know of in OSX.
-Jeremy.
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| Re: IMDISP and writing to Postscript [message #65904 is a reply to message #65903] |
Thu, 26 March 2009 19:39  |
liamgumley
Messages: 74
Registered: June 2005
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Member |
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On Mar 26, 7:13 pm, mooner <Emily.Wisnio...@gmail.com> wrote:
> Hi, I am using IDL to display some data. I find IMDISP to be perfect
> for this and it works great in 'x' windows. My image is (forgive me,
> I'm not quite sure how to describe this) is low resolution and I want
> it to be displayed as individual squares (of different colors) which
> IDL happily does in my x window. However when I write to postscript
> the image is 'blured' (I don't get well defined flat squares). I've
> played with all the keywords in device and imdsp but with no luck.
>
> Any suggestions?
>
> Cheers,
> Emily
Emily,
I can confirm that when your code sample is run in IDL 6.4 on OS X,
and the PostScript file is viewed with Preview.app, the image is
indeed smoothed. It appears to be happening in Preview when the
Postscript file is converted to PDF. I'm guessing that the same thing
will happen regardless of the IDL code used to display the image.
Here is a workaround, perhaps it will meet your needs. If your image
is truly small (less than 10 rows by 10 columns), you could always do
something like this:
nx = 5
ny = 5
a = findgen(nx, ny) ; original image
b = rebin(a, 100 * nx, 100 * ny, /sample) ; resampled image
loadct, 13
imdisp, b
pson, file='test.ps'
imdisp, b
psoff
The resampled image in test.ps will show the blockiness present in the
original image, since the resampled image is created via pixel
replication. Note that I've used imdisp.pro, pson.pro and psoff.pro
from
http://gumley.com/PIP/Sample_Programs/PIP_programs.zip
Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/
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| Re: IMDISP and writing to Postscript [message #65910 is a reply to message #65907] |
Thu, 26 March 2009 18:13 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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mooner writes:
> Sure, for example:
>
> set_plot, 'PS'
> device, /color, bits_per_pixel=3D8, filename=3Doutname+'.ps'
> loadct, 13
> imdisp, findgen(5,5)
> device, /close
>
> If I exlucde the postscipt and plot in an x window I get a 5X5 box
> with 25 individual squares. But when I plot to postscript the
> individual squares are blended, appearing like a gradient with more
> than 25 colors.
Yeah, I don't know. That is exactly what I did. I see
25 individual squares in both. Strange.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: IMDISP and writing to Postscript [message #65911 is a reply to message #65910] |
Thu, 26 March 2009 17:42 |
mooner
Messages: 3
Registered: March 2009
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Junior Member |
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On Mar 27, 11:31 am, David Fanning <n...@dfanning.com> wrote:
> mooner writes:
>> Hi, I am using IDL to display some data. I find IMDISP to be perfect
>> for this and it works great in 'x' windows. My image is (forgive me,
>> I'm not quite sure how to describe this) is low resolution and I want
>> it to be displayed as individual squares (of different colors) which
>> IDL happily does in my x window. However when I write to postscript
>> the image is 'blured' (I don't get well defined flat squares). I've
>> played with all the keywords in device and imdsp but with no luck.
>
>> Any suggestions?
>
> Humm. Sure you are using the latest version? It certainly
> doesn't do that for me. Maybe we could see the code
> you are using.
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Sure, for example:
set_plot, 'PS'
device, /color, bits_per_pixel=8, filename=outname+'.ps'
loadct, 13
imdisp, findgen(5,5)
device, /close
If I exlucde the postscipt and plot in an x window I get a 5X5 box
with 25 individual squares. But when I plot to postscript the
individual squares are blended, appearing like a gradient with more
than 25 colors.
Emily
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| Re: IMDISP and writing to Postscript [message #65960 is a reply to message #65872] |
Mon, 30 March 2009 10:05 |
mankoff
Messages: 131
Registered: March 2004
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Senior Member |
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On Mar 29, 7:55 am, Jeremy Bailin <astroco...@gmail.com> wrote:
> On Mar 28, 5:24 pm, ed.schm...@gmail.com wrote:
>
>
>
>> On Mar 27, 9:03 am, Brian Larsen <balar...@gmail.com> wrote:> Right I have learned that Preview.app lesson that hard way on more
>>> than one occasion. The ps file is fine is the pdf that is no good
>>> that you are really viewing.
>
>>> Instead of illustrator I find the easiest solution to use Acrobat
>>> Distiller, I have it set as the default application for ps/eps files.
>
>> Emily,
>
>> Two other ways of viewing .ps files under OSX are the Gimp and
>> Photoshop Elements. I tried both of these with your 5x5 idl.ps file,
>> and both of them display the image without any smoothing.
>
>> Ed Schmahl
>
>>> Double-click and it makes pdfs that look great. Of course you have to
>>> have acrobat pro to have this but if you do its a great solution.
>
>>> Brian
>
>>> ------------------------------------------------------------ --------------
>>> Brian Larsen
>>> Boston University
>>> Center for Space Physicshttp://people.bu.edu/balarsen/Home/IDL
>
> And there's always ghostview! Still the fastest way of looking at a ps
> file that I know of in OSX.
>
> -Jeremy.
Yes. Finally usable too. Do you install via fink or some other
method?
About a year or two ago the fink gv required installing all of gnome.
What a bizarre waste of space and dependencies. Your post made me re-
check it and it appears gv is now slim again, and a new package ggv
exists which includes gnome.
gv has the beautiful feature of 'watching' a file, so you can re-
create and fine-tune your postscript file while leaving gv running to
the side or on a second monitor and see your changes in realtime.
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