| Re: Contour object quality [message #35429] |
Fri, 13 June 2003 06:57  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Jacques Basson writes:
> Thanks David, that put me on the right track! Although it does lead me
> to another question... According to the IDL documentation, the
> resolution for direct graphics is 1000 dots/cm. So when I said that I
> did try all the keywords to IDLgrClipboard, I had tried
>
> contwindow = obj_new('IDLgrClipboard', dimensions=[17.8,12.7], $
> units=2, Resolution=[0.001, 0.001])
>
> but got the error message
>
> % OBJ_NEW: Window DIMENSION[0] exceeds maximum.
> Clamping to screen dimensions.
>
> (the dimensions of 178mm X 127mm are taken from the direct graphics
> output). 292dpi (which is borderline for high quality printing of lines)
> is the maximum possible resolution that I could get with those
> dimensions. And for your 5"x5" plot, the maximum is 409dpi.
>
> So it seems like I can't get the direct graphics resolution. However,
> no-one *really* needs 2540dpi, but I can't even get 600dpi, which is a
> noticeable for my required A3 output.
I didn't notice a question in there, but you are
correct that the resolution of the IDLgrClipboard
is limited. I seem to recall a post from Karl Schultz
that addressed this issue, but I haven't been able
to find it in 15 minutes of searching. Maybe
Karl could help us out again.
I suppose you could have better luck using the PRINTER
device rather than the clipboard, but I don't have time
to try it this morning. I have a truck-load of large
rocks showing up in a half hour and my back is already
getting sore. :-(
> Interestingly, the object eps file was twice the size of the direct
> graphics eps file (object at 292dpi - direct at 2540dpi).
Only twice as large!? You must really be living right. :-)
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Contour object quality [message #35430 is a reply to message #35429] |
Fri, 13 June 2003 00:06  |
Jacques Basson
Messages: 17
Registered: May 1999
|
Junior Member |
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David Fanning wrote:
> Jacques Basson writes:
>
>
>> I just can't seem to get good quality PostScript from IDLgrContour. A
>> brief example is at the end of this post. The direct graphics gives nice
>> smooth polylines, but the object output produces pretty jagged lines. I
>> suspect that it is the contour routine that is the problem because the
>> axis numbers are pretty smooth.
>>
>> I have tried playing with pretty much all of the keywords in
>> IDLgrContour and IDLgrClipboard, but nothing seems to improve the quality.
>>
>> Is there some trick here that I am missing - some magic keyword that
>> will sort out my plots?
>
>
> The magic keyword is RESOLUTION. :-)
>
> I set up your clipboard like this and got reasonable
> results:
>
> contwindow = obj_new('IDLgrClipboard', Dimensions=[5,5], $
> Units=1, Resolution=[2.54/300., 2.54/300.])
>
> You can learn more about this in this article:
>
> http://www.dfanning.com/ographics_tips/object_eps.html
>
> Cheers,
>
> David
>
Thanks David, that put me on the right track! Although it does lead me
to another question... According to the IDL documentation, the
resolution for direct graphics is 1000 dots/cm. So when I said that I
did try all the keywords to IDLgrClipboard, I had tried
contwindow = obj_new('IDLgrClipboard', dimensions=[17.8,12.7], $
units=2, Resolution=[0.001, 0.001])
but got the error message
% OBJ_NEW: Window DIMENSION[0] exceeds maximum.
Clamping to screen dimensions.
(the dimensions of 178mm X 127mm are taken from the direct graphics
output). 292dpi (which is borderline for high quality printing of lines)
is the maximum possible resolution that I could get with those
dimensions. And for your 5"x5" plot, the maximum is 409dpi.
So it seems like I can't get the direct graphics resolution. However,
no-one *really* needs 2540dpi, but I can't even get 600dpi, which is a
noticeable for my required A3 output.
Interestingly, the object eps file was twice the size of the direct
graphics eps file (object at 292dpi - direct at 2540dpi).
Thanks,
Jacques
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| Re: Contour object quality [message #35452 is a reply to message #35430] |
Thu, 12 June 2003 07:06 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
Jacques Basson writes:
> I just can't seem to get good quality PostScript from IDLgrContour. A
> brief example is at the end of this post. The direct graphics gives nice
> smooth polylines, but the object output produces pretty jagged lines. I
> suspect that it is the contour routine that is the problem because the
> axis numbers are pretty smooth.
>
> I have tried playing with pretty much all of the keywords in
> IDLgrContour and IDLgrClipboard, but nothing seems to improve the quality.
>
> Is there some trick here that I am missing - some magic keyword that
> will sort out my plots?
The magic keyword is RESOLUTION. :-)
I set up your clipboard like this and got reasonable
results:
contwindow = obj_new('IDLgrClipboard', Dimensions=[5,5], $
Units=1, Resolution=[2.54/300., 2.54/300.])
You can learn more about this in this article:
http://www.dfanning.com/ographics_tips/object_eps.html
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Contour object quality [message #35511 is a reply to message #35429] |
Wed, 18 June 2003 01:23 |
basson
Messages: 4
Registered: June 2003
|
Junior Member |
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David Fanning <david@dfanning.com> wrote in message news:<MPG.19538635dc21919f989688@news.frii.com>...
> Jacques Basson writes:
>
>> Thanks David, that put me on the right track! Although it does lead me
>> to another question... According to the IDL documentation, the
>> resolution for direct graphics is 1000 dots/cm. So when I said that I
>> did try all the keywords to IDLgrClipboard, I had tried
>>
>> contwindow = obj_new('IDLgrClipboard', dimensions=[17.8,12.7], $
>> units=2, Resolution=[0.001, 0.001])
>>
>> but got the error message
>>
>> % OBJ_NEW: Window DIMENSION[0] exceeds maximum.
>> Clamping to screen dimensions.
>>
>> (the dimensions of 178mm X 127mm are taken from the direct graphics
>> output). 292dpi (which is borderline for high quality printing of lines)
>> is the maximum possible resolution that I could get with those
>> dimensions. And for your 5"x5" plot, the maximum is 409dpi.
>>
>> So it seems like I can't get the direct graphics resolution. However,
>> no-one *really* needs 2540dpi, but I can't even get 600dpi, which is a
>> noticeable for my required A3 output.
>
Damn news feed seems to be down (again), so hopefully this posting
from google will get through.
> I didn't notice a question in there, but you are
> correct that the resolution of the IDLgrClipboard
> is limited. I seem to recall a post from Karl Schultz
> that addressed this issue, but I haven't been able
> to find it in 15 minutes of searching. Maybe
> Karl could help us out again.
Well, "why does it suck so bad?" seems a bit unfair for a question...
> I suppose you could have better luck using the PRINTER
> device rather than the clipboard, but I don't have time
> to try it this morning. I have a truck-load of large
> rocks showing up in a half hour and my back is already
> getting sore. :-(
Except that the printer that I will be printing on is on a different
machine - and last time I tried to setup a PostScript printer and use
"print to file", IDL hung the machine :( I have since redone my
routine using direct graphics (much quicker than trying to sort out
this problem).
>
>> Interestingly, the object eps file was twice the size of the direct
>> graphics eps file (object at 292dpi - direct at 2540dpi).
>
> Only twice as large!? You must really be living right. :-)
Right on the very edge!
Thanks for the help.
Jacques
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