The [.tif] files use an unsupported compression algorithm

Question

I have 13,000 images imported to Lightroom Classic 11.1

I have an additional 200 images that were not imported because of the error: The files use an unsupported compression algorithm. All the problem images are scanned from Slide or Print using an Epson V850 Pro.

I guess that I did something different, but I don't know what, because in a given folder I have a mix of .tif image files that cannot be imported, and others that can.

In one folder files that successfully imported are between 141Mb and 249Mb, and problem files are about 5Mb.

Photoshop 2022 and other programs have no problems opening the files.

This picture is an example of the files that don't import. https://shared-assets.adobe.com/link/7fa972a5-aa16-47b6-77c3-af8ef4f3ef6e

Canhttps://shared-assets.adobe.com/link/7fa972a5-aa16-47b6-77c3-af8ef4f3ef6eI am using Windows 10 Pro ver 21H2, 64GB memory, nVidia GeForce RTX 2070 with 8GB memory. As far as I can tell, hardware is not part of the problem.

Can anyone suggest what is causing this issue and how to fix it?

Thanks

Per Berntsen · Accepted Answer

I don't know what's causing the issue, but my guess is that you have chosen to save with compression in the Epson scanning software, and that something went wrong in the compression process. It seems that you saved the file with jpg compression, since that was already checked in the Tiff options dialog when I saved.

Saving a Tiff with jpg compression is kind of pointless, since jpg compression is lossy, while LZW compression is lossless.

If you want to compress Tiff files, use LZW for 8-bit and ZIP for 16-bit. Both use lossless compression.

I opened your example file in Photoshop, and resaved without compression and with LZW compression.

In both cases, the file imported in Lightroom with no issues.

So the fix is to resave in Photoshop.

DS256 · Answer

I looked at the TIF tags in the picture and the Compression is listed as "JPEG Technote #2". I found the same as you; LrC 11 would not open it but Photoshop 2021 will. You can then save it and change the Compression from JPG to something else. I changed it to LZW and was able to load it into LrC.

Have a look at the V850 TIF compression options. It looks like it may be based in other options. https://files.support.epson.com/docid/cpd3/cpd39283/Source/Scanners/Source/Scanning_Software/Reference/easy_photo_scan_tiff_settings.html

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