Reported V4.25: TIFF is mirrored

[teaorcoffee]

I just opened a couple of 4MB non-compressed tiffs in IrfanView and they were back-to-front (mirror images).

Opening in other programs and importing shows them correctly.

[Bhikkhu Pesala]

Try cropping them in various ways, saving as a new TIFF, etc., and see if the problem still occurs.

[eh45]

My 16 bit tiffs are also shown mirrored.
These are large files produced by Vuescan from a Nikon 4000ED scanner (typically 120MB), imported into Lightroom and then edited/manipulated/cropped.
All 600 files are shown mirrored by IrfanView (both thumbnail and full).
All files are shown correctly by ACDsee, XNView, Lightroom and many others.

I just checked with a file fresh from Vuescan wihtout import into Lightroom - this one is shown correctly. I then imported into Lightroom and changed white balance and "levels". Still OK in IrfanView.
I have no idea what causes this and at what stage of maanipulation.
Exif, IPTC manipulation bij Lightroom?
Older Tif files are OK - these are 8 bit ones

Who else has this problem?
regards
Edwin

I use latest versions of Irfanview, Lightroom, W2000, 4GB.

[Frank]

@teaorcoffee and eh45

Can you give us a sample file?
(Compress your file into zip or 7z format and then upload!)

Then we can try it also with programs like XnView, ... or others.

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@teaorcoffee

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