| Computer freezes when IDL 5.5 tries to display an image larger than the given window [message #29929] |
Wed, 27 March 2002 09:13 |
sandeep.dalal
Messages: 3
Registered: January 2001
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Junior Member |
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I have a problem with IDL 5.5 on my computer. I was wondering if
someone reading this newsgroup who has IDL 5.5 on a Windows NT
dual-processor PC can try to reproduce this problem.
I have also emailed a report to RSI to find out if this is a known bug
or perhaps it has something to do with my specific hardware
configuration.
My configuration is as follows:
Hardware: Dual Processor workstation (866 MHz PIII), Nvidia
Quadro2-Pro graphics card
OS: Windows NT Workstation 4.0 with Service Pack 6
The problem is as follows:
My display is true-color and I start IDL with decomposed mode on as
shown below. I read an image file which is a true-color image. Then I
display it and using tv, img, /true and it displays just fine.
If I now create a window which is smaller in the Y dimension than the
image I want to display in it, then the moment I run the tv, img,
/true command, IDL as well as the whole computer freezes with no
response to either the keyboard or the mouse. The only solution is to
use the hardware reset button on the computer since I cannot bring up
the taskmanager anymore.
IDL> help,/dev
Available Graphics Devices: CGM HP METAFILE NULL PCL PRINTER PS WIN Z
Current graphics device: WIN
Screen Resolution: 1280x1024
Simultaneously displayable colors: 16777216
Number of allowed color values: 16777216
System colors reserved by Windows: 0
IDL Color Table Entries: 256
NOTE: this is a TrueColor device
Using Decomposed color
Graphics Function: 3 (copy)
Current Font: lutrs10, Current TrueType Font: <default>
Default Backing Store: Pixmap.
Window Status: (ID: Type(x, y, backing store))
0: Window ( 720, 576, Pixmap)
IDL> img = read_image('test.jpg')
% Compiled module: READ_IMAGE.
% Compiled module: QUERY_IMAGE.
% Loaded DLM: JPEG.
IDL> help,img
IMG BYTE = Array[3, 733, 487]
IDL> tv,img,/true ; this one displays just fine
because window 0 is 720x576
IDL> window,1,xs=720,ys=487
IDL> tv,img,/true ; now window's Y size is equal to
image's Y size and it displays fine
IDL> window,1,xs=720,ys=486
IDL> tv,img,/true ; computer freezes at this point
Note that the window's X size is 720 and the image's X size is 733 so
apparently the X size of the window may be smaller for the image to be
displayed. But that is not true of the Y size.
I tried to reproduce this problem on a Windows 2000 computer which
also runs IDL 5.5 but that is a single-processor system and it did not
freeze even when the window sizes were smaller than the image size I
was trying to display. Maybe the problem is specific to
multi-processors only.
Thanks
Sandeep Dalal
Philips Research
345, Scarborough Road
Briarcliff Manor, NY 10510
** My opinions do not necessarily reflect those of my employer **
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