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Re: IDLgrWindow Setting - Why render image gets erased? [message #46107]

Tue, 01 November 2005 17:17

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Victor wrote:
> ...I'm not sure if this
> is a bug in Xobjview - when I export the image into .TIFF (using
> file->export) and later open with a Tiff editor, the image is
> "FLIPPED". It gets exported just fine if exported as .JPEG !

I see the same behaviour.

The documentation for WRITE_TIFF, keyword ORIENTATION has a good outline
of the issues here. It ends with...

Warning
Not all TIFF readers honor the value of the ORIENTATION field. IDL
writes the value into the file, but some readers are known to ignore
this value. In such cases, we recommend that you convert the image to
top-to-bottom order with the REVERSE function and then set ORIENTATION to 1.

The above suggest this is a problem with the viewer, but I see it with
several viewers: Quicktime PictureViewer, Xnview, Microsoft Imaging for
Windows, Paint Shop Pro and ImageMagick Imdisplay. I note that the
iTools do *not* have this behaviour. So I think that it needs to be
fixed in Xobjview. You should report this to RSI as a bug. It's probably
not too hard to jump into the Xobjview code and fix it for yourself. Or
just choose another format like PNG or JPEG. Do you have any reason for
wanting TIFF output?

--
Mark Hadfield "Kei puwaha te tai nei, Hoea tahi tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: IDLgrWindow Setting - Why render image gets erased? By: Mark Hadfield on Tue, 01 November 2005 17:17
		Re: IDLgrWindow Setting - Why render image gets erased? By: Victor[1] on Tue, 01 November 2005 15:00
		Re: IDLgrWindow Setting - Why render image gets erased? By: Karl Schultz on Tue, 01 November 2005 08:02
		Re: IDLgrWindow Setting - Why render image gets erased? By: David Fanning on Mon, 31 October 2005 18:23

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