Photoshop by default basically uses TIFF LZW type of compression when saving PSD native files, so a flatten PSD file and a Flattened TIFF file will be close in size.

Britt Griswold

----- Original Message -----
From: Karen Ackoff [mailto:[log in to unmask]]
To: [log in to unmask]
Sent: Wed, 8 Jan 2014 14:04:20 -0500
Subject: Re: [SCIART] Photoshop: saving PSD files as TIFFs question

I would expect the PSD file to be larger. Check, when you do a SAVE AS to see if "Layers" are selected. Regardless of whether or not you have flattened the file, a PSD file is likely to look for layers, layer modes, filters, adjustment layers, etc. - whether or not they have actually been used. TIFF files don't have these features, so these files would logically be smaller in size.

At least that's what makes sense to me.


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