| Re: Congrid problem [message #23843] |
Fri, 23 February 2001 09:03 |
pit
Messages: 92
Registered: January 1996
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Member |
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Paul van Delst <pvandelst@ncep.noaa.gov> writes:
> IDL> print, !version
> { x86 linux unix 5.4.1 Jan 16 2001 32 32}
> IDL> a = bytarr(100,100) + 155b
> IDL> b = congrid(a,140,140,/interp)
> % Compiled module: CONGRID.
> IDL> print, min(b), max(b)
> 155 155
> IDL> w = where(b eq 154, count)
> IDL> print,count
> 0
Same here, { x86 linux unix 5.2 Oct 30 1998}
Pit
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~
Dr. Peter "Pit" Suetterlin http://www.astro.uu.nl/~suetter
Sterrenkundig Instituut Utrecht
Tel.: +31 (0)30 253 5225 P.Suetterlin@astro.uu.nl
____________________________________________________________ ______________
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| Re: Congrid problem [message #23853 is a reply to message #23852] |
Fri, 23 February 2001 06:32  |
Jaco van Gorkom
Messages: 97
Registered: November 2000
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Member |
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Craig Markwardt wrote:
>
> Jonathan Joseph <jj21@cornell.edu> writes:
>
>> I'm running IDL 5.3 on HP-UX and seeing the following
>> problem with congrid. I have a byte image that has large areas
>> of a particular solid color (a background color).
>> I rescale the image to be larger using congrid with the
>> /interp flag set. My nice solid areas of the background color,
>> which I would still expect to see unspoiled, now have artifacts
>> in them with value background_color - 1. This looks like a
>> bug. What's going on?
>>
>> Here's an example that show's the problem:
> ... deleted ...
>
> Your example doesn't have the artifact on Linux on IDL 5.2 and IDL
> 5.3. It sounds like a bug under HP-UX.
>
...
I can reproduce the problem on SunOS 2.7, running IDL 5.3 on a Sparc
CPU.
Jaco
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| Re: Congrid problem [message #23854 is a reply to message #23853] |
Fri, 23 February 2001 06:13 |
Paul van Delst
Messages: 364
Registered: March 1997
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Senior Member |
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Jonathan Joseph wrote:
>
> I'm running IDL 5.3 on HP-UX and seeing the following
> problem with congrid. I have a byte image that has large areas
> of a particular solid color (a background color).
> I rescale the image to be larger using congrid with the
> /interp flag set. My nice solid areas of the background color,
> which I would still expect to see unspoiled, now have artifacts
> in them with value background_color - 1. This looks like a
> bug. What's going on?
>
> Here's an example that show's the problem:
>
> IDL> a = bytarr(100,100) + 155b
> IDL> b = congrid(a,140,140,/interp)
> IDL> print, min(b), max(b)
> 154 155
> IDL> w = where(b eq 154, count)
> IDL> print,count
> 3703
> IDL> tvscl, b eq 154 ;shows strange pattern of lines and dots
>
> I would expect b in this example to be filled only with value 155.
> Is this a bug or is there some other reason I am seeing this behavior?
>
> BTW: I see the exact same behavior with INT instead of BYTE.
>
> Thanks.
>
> -Jonathan
IDL> print, !version
{ x86 linux unix 5.4.1 Jan 16 2001 32 32}
IDL> a = bytarr(100,100) + 155b
IDL> b = congrid(a,140,140,/interp)
% Compiled module: CONGRID.
IDL> print, min(b), max(b)
155 155
IDL> w = where(b eq 154, count)
IDL> print,count
0
--
Paul van Delst A little learning is a dangerous thing;
CIMSS @ NOAA/NCEP Drink deep, or taste not the Pierian spring;
Ph: (301)763-8000 x7274 There shallow draughts intoxicate the brain,
Fax:(301)763-8545 And drinking largely sobers us again.
pvandelst@ncep.noaa.gov Alexander Pope.
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| Re: Congrid problem [message #23855 is a reply to message #23854] |
Fri, 23 February 2001 05:53 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Jonathan Joseph <jj21@cornell.edu> writes:
> I'm running IDL 5.3 on HP-UX and seeing the following
> problem with congrid. I have a byte image that has large areas
> of a particular solid color (a background color).
> I rescale the image to be larger using congrid with the
> /interp flag set. My nice solid areas of the background color,
> which I would still expect to see unspoiled, now have artifacts
> in them with value background_color - 1. This looks like a
> bug. What's going on?
>
> Here's an example that show's the problem:
... deleted ...
Your example doesn't have the artifact on Linux on IDL 5.2 and IDL
5.3. It sounds like a bug under HP-UX.
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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