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Lossless compression for PSD files
Old 06-16-2005, 07:41 AM   #1 (permalink)
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Is there a program that can losslessly compress PSD files similar to the Adobe DNG format?

I save about half on my digital negatives when I compress them and it occured to me that if such a program existed I would save even more with my PSDs which generally run around 77MB.

Thanks in advance.

PS - This needs to be a realtime algorithm requiring no intermediate step in Photoshop (i.e. not ZIP, LZH, etc.)
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Re: Lossless compression for PSD files
Old 06-16-2005, 08:15 AM   #2 (permalink)
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I don't think that I've ever seen a compression scheme for Photoshop's native format. You could try TIFF with compression.

If you have files with layers, make sure to compress the final file to save lots of space.

Tom
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Re: Lossless compression for PSD files
Old 06-16-2005, 08:20 AM   #3 (permalink)
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Is there a reason why you could use the TIFF format with the layers included? Compressed TIFF files are much smaller than PSD and I don't see any real speed issues.

Just curious - 'cause I want to use it exclusively instead of PSD now. It is my understanding that compressed TIFF is lossless.

Greg
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Re: Lossless compression for PSD files
Old 06-16-2005, 09:30 AM   #4 (permalink)
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Don't you lose some flexibility with your images when you move to TIFF? Or do you just lose layers?

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Re: Lossless compression for PSD files
Old 06-16-2005, 07:31 PM   #5 (permalink)
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In the CS versions, you can save a layered tiff.
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Re: Lossless compression for PSD files
Old 06-16-2005, 09:04 PM   #6 (permalink)
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I just tried an experiment. The PSD was 41MG in this case and the TIFF was 54. So it appears the PSD is more thrifty. Am I missing something?
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Re: Lossless compression for PSD files
Old 06-16-2005, 10:23 PM   #7 (permalink)
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did you make sure to check "LZW Compression" when the save windo comes up?
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Re: Lossless compression for PSD files
Old 06-17-2005, 01:29 PM   #8 (permalink)
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Yes. And I tried saving it again, and again it was bigger. Apparently, at least in CS2, the Photoshop format is the most space economical. Who would have thunk it.
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