Im opening a 16 bit tiff file in GIMP 2.10.38, and Gimp seems to turn it into a 8 bit file? RGB color 8-bit gamma integer, GIMP built-in sRGB, 1 lay. What does this mean? The file has no profile but is in 16 bits.
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There’s been some work regarding colorspaces, so perhaps your issue is fixed there.
Mind: it’s rc1. While it’s expected to function properly, there might still be issues.
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GIMP 2.10.31 on Debian 12 opens 16bit png as expected.
Exported a NEF to 16 bit png from Rawtherapee.
Then opened with GIMP the just exported image.
Picture mode is RGB (as expected), the precision is 16 bit integer (as expected).
Did not try with TIFF, I use PNG always.
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The picture mode is sRGB(?), which I think is a bit strange considering that profile is 8 bits. Neither do I understand why Gimp doesnt open my 16 bit as 16 bits, when it can with pngs.
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Can you try to convert the tiff to png? If it is not multipages, that may be a workaround.
I never used tiff, only pngs, but this worked me always.
Now I tried to export to a 16 bit integer tiff, and it works here too.
So either it’s a bug in your version of GIMP, or it’s something with that particular file.
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It seems to have been a problem in the windows version as well: 16 bit support Maybe my issue is similar.
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Rather than using GIMP itself - maybe try using imagemagick to convert the tiff to png? Then open the 16 bit PNG in GIMP?
I don’t have many TIF files - my most recent use of them is in Autodesk Sketchbook on Android and iOS (iPad) - but also occasionally the Windows version (which works mostly without issues in Wine) - but never attempted to open them in GIMP… I don’t know if they’re 16 bit or not - but - quite a few of them have multiple layers… Mostly when I want to use Autodesk Sketchbook files outside of Sketchbook - I export to PSD…
Or maybe imagemagick could convert the 16 bit TIF to 16 bit PSD?
Note: in mostly cases - imagemagick is installed by default on Ubuntu based distros (maybe debian too?) - but - I mostly use just the “convert” or “mogrify” commands
convert filename.tif filename.png
there are probably a whole bunch of switches you can use to ensure the 16 bit data is converted too… YMMV
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I got cache resources exhausted when I tried opening the file with Imagemagick. Its a 1.1 GB tiff file (its a drumscanned 8x10" negative).
I might just continue using PhotoLine with Wine (I considered Gimp to not have to go through Wine). But this Imagemagick seems pretty interesting - its color management seems pretty good so it would be neet to get it to work, but I dont know why it will not open my tiff file.
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Check this, maybe it helps you!
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Thanks. Ill check it out. ImageMagick seems to support raw as well 
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Reducing the number of pixels and dpi opened the image. I would like to be able to open the image as scanned though.
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I just made the assumption that most people on here would know that imagemagick is a suite of command line, image manipulation tools…
I’ve NEVER tried to use imagemagick to “open” files… My first encounter with imagemagick was on Silicon Graphics UNIX (IRIX) when a customer asked to install it on an SGI “server”. I do recall seeing some of the binaries available in apache - it was common for webservers to use “cgi-bin” to do stuff like present thumbnails on webpages (instead of render the full sized image - back when 75% of internet users were on dial up).
If I remember - I either had to hunt down mip32 or mips64 binaries - or get the source and compile for mips32 / 64 bit IRIX…
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There is a program called ORBIT which can handle very large format images.
It is really for microscope images, but it might handle your large tiff file.
It is in the Debian repo.
Also look at VIPS and ImageJ
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ImageJ does open the file, but I’ll go with PhotoLine thru Wine for now. Thanks fellas.
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