Hope you don’t mind, but I’m responding to your post in “The case of the missing COMMENT” here, lest we incur the wrath of the admins for straying too far from the original topic.
I use PNG because it’s compressed but lossless, and I can (currently) upload 32-bit PNGs to my Google Photos account without having them count against my combined Google account free storage limit of 15 GB (reportedly, ALL image uploads to Google Photos after some date in June of this year will count against the free storage limit). I experimented with TIFF a bit some years ago, but didn’t see any way to save them with LZW or other compression from any of the tools I commonly use (mostly Corel PaintShop Pro and GIMP), and am not in a position to shell out for Photoshop or other “professional-level” applications. Also, as great as DOpus is, I can’t use it natively to convert to TIFF.
If you have any other suggestions, I’m open.