I am using Affinity Photo 1.4.3 on a late 2015 iMac running Mac OS 10.12. I have written a program that exports pretty simply tiff files. Every app I have tried reads the files my app writes, except Affinity Photo. I have tried Preview, Photoshop, Lightroom, Aperture, Pixelmator, Viveza 2, Safari (I did not know it worked as an image viewer, but it does)). I think maybe Photo is trying to interpret the tiff file as a RAW file. I have attached two screen grabs. One shows the upper left corner of the Photo window with one of the files my app wrote.
Free TIFF Viewer by Free Picture Solutions is a free to use piece of software that was designed to help you view and edit TIFF image files (as well as several other graphics formats). Sadly, there is no information about the release of Free TIFF Viewer for Mac, so you might want to search for other TIFF editors for Mac.
The other shows the upper left corner of Photo with one of the input files to my app (which was written by lightroom). My app averages stacked images to reduce noise, so I expect the two images to be pretty much the same except for noise. Any suggestions or ideas on what might be going on here? Lee, I have found that if I include either or both of these tiff tags in the metadata Photo assumes that the tiff file is really a RAW file. 'Make' = 'Canon' 'Model' = 'Canon EOS 5DS' If I include just one of these tags, either one, the result is different from when I include both.
Now that is weird. Both tags matter and no other tag matters. I copy all the tiff and exif data from the source images so there are a lot of tags. Simply removing these two tags from the tiff data solves the problem. Just for kicks, I tried 'Make' = 'Nikon' and I got the same result that I got with 'Make' = 'Canon'.
In iOS 8, enabling the 'Read Tiff' app extension is the easiest way to read a TIF/TIFF file in Safari. To enable the Read Tiff app extension: 1) Navigate to a URL of a TIF/TIFF file in Safari. 2) Locate the Share icon (The box with the arrow) and tap it.
3) In the bottom row of icons, swipe until you're at the right-most end of the list. Tap More (.) 4) Enable the Read Tiff switch and tap Done.
5) You should now be able to see and use the Read Tiff app extension to read the TIFF file directly from Safari.