Tiff: IOError: cannot identify 16-bit TIF file

[vigliensoni]

When trying to convert a TIF image to PNG with this wrapper, a "cannot identify image file" error is raised. This behavior seems to be related to the inability of PIL to handle images with individual channels > 8 bit (python-pillow/Pillow#1888).

We should find a way of opening 16-bit TIF files.

[vigliensoni]

@deepio This seems to have been fixed in the latest Gamera release. Check https://github.com/hsnr-gamera/gamera/releases/tag/3.4.3

[vigliensoni]

@martha-thomae Could you please provide your insights with this issue?

[martha-thomae]

Hi @vigliensoni.
Yes, I also had some issues when trying to display TIF images in Rodan and when trying to convert them into PNG within Rodan and in my case these images were already 8-bit. The issue with my TIF images was that they used an uncommon ColorSync Profile (OS14K_A1_B8_oG_IT8_270109_editiert). When I changed this into a more standard profile like Adobe RGB (1988) or Generic RGB Profile, the problem was solved. I can now view these images in Rodan and use them in different Rodan jobs such as Pixel and any PIL Conversion job (including conversion to PNG). All of these were impossible using the older (weirder) color profile.

[martha-thomae]

We could include a PIL job that changes the color profile of an image. I have the code I used for this (but I also tried other ways besides PIL, I used Automator and also there is an option in Preview to assign a profile).

[deepio]

Issue was fixed when updating pil-rodan. It was also tested on staging and there was no error. 16bit tiff file worked!