| Re: Problem displaying images on 8 bit monitor [message #50564 is a reply to message #50563] |
Tue, 10 October 2006 03:35   |
mark
Messages: 28
Registered: September 1992
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Junior Member |
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Hi David,
Here are how the images look. Both of these images are of the same
variable:
bytscl(bindgen(256) # bindgen(256))
This first image is how it should look, and it does using other display
programs on my monitor:
http://hem.passagen.se/fysikern/idl/normal_display.tif
This image is a screen-capture using TVRD() of the same variable
displayed in IDL using either TV and TVSCL.
http://hem.passagen.se/fysikern/idl/idl_display.tif
The monitor I have is a CRT high-resolution mammography monitor (around
1500x2500 pixels)
Any helpful hints?
Mark
mark skrev:
> Hi David,
>
> Thanks for you responses yesterday but I still can't get the images
> displayed properly. I'm sorry for insuating that IDL was at fault! :-)
> I'm sure I'm not doing something right...
>
> In response to your suggestions yesterday:
> TV, bindgen(256) # bindgen(256) yields a strange looking image (as
> expected)
>
> TVSCL, bindgen(256) # bindgen(256) gives me an image of the type I've
> been getting: a gradient consisting of narrow bands (or
> tiles/contours). There are about 30 such distinct bands along the
> gradient. I'm not sure if that number is significant. It would help if
> I could send you a screen-dump or something to show you what I mean.
>
> TV, bytscl(bindgen(256) # bindgen(256)) gives the same result as above
> with the bands.
>
> Byte scaling my own images doesn't change anything (they're already in
> byte format).
>
> So I'm still in the same situation...
>
>
> David Fanning skrev:
>
>> mark writes:
>>
>>> So, there is something not set up right in my IDL environment...
>>> and I have no idea what it is...
>>
>> I rather doubt this. :-)
>>
>> Can you humor me? Try these commands:
>>
>> IDL> Loadct, 0
>>
>> Is this what you are seeing:
>>
>> IDL> TV, bindgen(256) # bindgen(256)
>>
>> What about this?
>>
>> IDL> TVSCL, bindgen(256) # bindgen(256)
>>
>> What about if you scale your image before you display it:
>>
>> IDL> TV, BytScl(image)
>>
>> 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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