Losing access to an LZW conversion option in future software is certainly a reasonable concern, I can see going without the compression for archiving. It is critical still for working projects where you have to transfer to other people over limited connections and online storage. I would say the I have more concerns about things like Apple’s format inventions like PICT, and now a new ones they use for photo & video storage (HEIF & HEVC). I think TIFF with LZW compression will be with us for hundreds of years, but I could be wrong…
I currently open PICT images with Apple Preview and then save it as a PDF. From there I can extract the image in Illustrator or possibly Acrobat, and resave it to my preferred format in Photoshop.
According to an online Apple discussion PICTs can be opened also with GraphicConverter 10.5.5
In a pinch, when I’ve needed to keep file sizes smaller, I’ve used LZW compression. But if something is being archived… technology changes and who knows what compression algorithms will be in the future and if newer programs will read older compressed images. So basically, I try to keep things simple.
As an example, I occasionally come across an old PICT image and those don’t seem to open (thankfully, not anything I need).
Any more, drive space isn’t much of an issue so I don’t need to worry about smaller file sizes.
On Jul 30, 2020, at 7:34 PM, Griswold, Britt (GSFC-279.0)[LUSA Associates] <[log in to unmask]> wrote:
Karen, TIFF LZW compression is suppose to be lossless. Why do you recommend not using LZW?
I’d have to agree with Bruce. I’d suggest saving them as either a Photoshop file or TIFF (no compression). Photoshop of course means you’d need a Photoshop to open the file. But a TIFF is not linked to any app and should open in a variety of apps.
Sent from my iPhone
On Jul 30, 2020, at 5:43 PM, MaryBeth Hinrichs <[log in to unmask]> wrote:
Has anyone done this: changed from jpeg to camera raw or dng format? Can this be done to batches of photos? I'm very interested in doing so because of the data loss problem with jpegs; we are archiving a ton of photos right now.
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