Why are processed files larger than RAW?

  ened 14:01 05 Dec 2007

I am using Photoshop Elements 6.

I'm sure there must be a simple explanation for this but I thought photos taken in the RAW format were'pure'.

However I have just noticed that a batch of pics. I took this morning and then converted to .psd are three times the size of the originals: RAW=5.84MB psd=15.1.

Can someone please explain this anomoly and I apologise if I am missing something obvious?

  Seth Haniel 14:16 05 Dec 2007

information to the file thus making them bigger

  anchor 14:28 05 Dec 2007

It seems psd files can be enormous.

click here

Why not save them as tiffs?.

click here

  hssutton 14:44 05 Dec 2007

A 5+mb raw could finish up at around 34 mb when converted to Tiff. I know as I have 1000s of them on my h/drives

The logic behind all this can be found click here
The article refers to Nikon, but the reasoning equally applies to other manufacturers

  David4637 14:48 05 Dec 2007

PSD files can contain many layers of images and will always be larger than the original file. DONT forget to save files for archive in tif, or psd, or last resort JPG. If you keep saving the same image as a jpg it loses quality each time due to compression. David

  hssutton 15:14 05 Dec 2007

Agree with what you say, but just to make it a little clearer.

A Tiff file can also contain many layers unless flattened. The file size of a "flattened" Tiff or PSD should be identical for the same image

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