AF randomly horizontally flipping scanned photos when open them.

[martsart]

From a folder of 100 freshly Vuescan scanned tiffs, Affinity Photo has suddenly decided to flip horizontally about 50% of them -  all have been prepared identically, but AP decides to flip some as I open them in Affinity. If I open such a 'faulty" tiff in Mac Preview first,. quickly flip it horizontally and then flip it back again, afterwards AF then opens it correctly. Never had the problem before with previous thousands of similarly processed tiffs over the last year. Any ideas?

[DWright]

Hi @martsart,

Welcome to the forum

tiff file have a orientation option in their metadata  and when the file is opened in Affinity Photo we read this filed and if is contains any data it s applied to the open file 

[John Rostron]

1 hour ago, DWright said:

Tiff file have a orientation option in their metadata  and when the file is opened in Affinity Photo we read this filed and if is contains any data it s applied to the open file 

Yes, but this refers to portrait or landscape orientation and should not affect horizontal (or vertical) flipping.

Do your flipped images have anything in common which might trigger this behaviour?

John

[Lisbon]

2 hours ago, DWright said:

tiff file have a orientation option in their metadata

This is so interesting.
I had no idea that you could change the orientation of a tiff file by editing the metadata.

And the orientation can vary in different ways:
-Horizontal (normal)
-Mirror horizontal
-Rotate 180
-Mirror vertical
-Mirror horizontal and rotate 270 CW
-Rotate 90 CW
-Mirror horizontal and rotate 90 CW
-Rotate 270 CW

PS: Im doing some experiments and just fliped a jpg by editing the metadata.

[R C-R]

9 hours ago, John Rostron said:

Yes, but this refers to portrait or landscape orientation and should not affect horizontal (or vertical) flipping.

As @Lisbon mentioned, there are eight possible orientation tags. The formal definition of each one can be found on various web sites, for example at https://www.awaresystems.be/imaging/tiff/tifftags/orientation.html.

[John Rostron]

I have to admit that after many thousand slide scans, using VueScan and SilverFast, and many hundred flatbed scans with VueScan, I have never experienced any rotation or flipping in the output files, which is why I asked:

Quote

Do your flipped images have anything in common which might trigger this behaviour?

John

[martsart]

Hello- sorry for delay in reply.  Seemed perfectly random, just old B and W photo album contents onto scanner, nothing else done to them.  Did 1000 photos a few months ago with no such problem. No change to normal portrait/landscspe behaviour. Not sure why flipping in Mac Preview seems to solve the problem. Anyway, will try another album shortly and let know of any recurrence, and if so, will connect to another Mac to compare reaction,; will look more closely to see if any common factor also, as you suggest, thanks, Martin

[martsart]

Hello again- in meantime- here's before and after screenshots of what happens. All I did inbetween the two screenshots was to quickly double-click open  the photo on the desktop in Preview, rotate it clockwise and back again and close it., then drag it back into Publisher rectangle. Martin -

screenshot_01.tifscreenshot_02.tif