Q about .psd files, compatability and file size

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tbm

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Mike
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Reckon this is going to be one of those posts - I fully expect to get no replies :p

I convert my RAW files to 16bit Tiff in DPP, which usually gives a filesize of about 50Mb. After adding various layers in photoshop, the files are usually circa 230Mb.

If I save these as "low compatability" .psds, the filesize usually falls to around 40mb.

In the interest of disk space I'd rather convert the files to .psd before adding the layers, but if I do this the filesize rises to about 100Mb when the layers are added. Resaving again usually drops the size to about 40Mb. Photoshop has been set to save as low compatibility .psd as a default.

Does anyone have any idea why this is happening and how to get round it? I've played with the idea of adding the layers when the files are batched to .psd, but am not sure if the filesize would grow again once they've been edited..

Cheers ;)
 
I don't know, but I would suggest that posting the question on a specific Photoshop forum would provide an answer. There are some clever guys 'n gals out there.

Sorry I can't help further.
 
No problem - thanks for your suggestion and humouring me with a reply :)
 
why do you convert RAW to 16bit tiff? Why not do the bulk of your editing in RAW - which can be non-destructive if you use Lightroom for example.
 
Thanks awp - I'll have a look at lightroom although I won't be spending any money in the near future :p

I convert to 16 bit Tiff as it's the only way I can edit the images using photoshop, since I have CS2 and it won't open files from my 40D.
 
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