Different file size between Photoshop, and finder/explorer?

I posted this discussion last week http://forums.adobe.com/message/5820325#5820325 and have now determined that some part (still don't understand how/why) of my scanning/saving workflow- is creating a new layer "Layer 0" to replace the locked Background layer. This is causing the image to double, or triple in size. However, upon opening the image in Photoshop, the size of the image doesn't match the size viewed in finder, or Bridge....Does anyone know why?
23mb in Photoshop.
44.81mb in Bridge.
44.81mb in Finder
EDIT: There is only one later in this image. No image edits, except for cropping. You can see in the last image, how using an identical workflow, some images are saving correctly (20ish mb) and some are double.

Assuming you are deleting the spurious Layer 0, have you also then flattened the image before saving to see if that makes a difference?
Cheers,
Neale
Insanity is hereditary, you get it from your children
If this post or another user's post resolves the original issue, please mark the posts as correct and/or helpful accordingly. This helps other users with similar trouble get answers to their questions quicker. Thanks.

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fotonut1 wrote:
The 26 mb number is found when I go to image size (alt cntrl I
Lets take a look at the Image Sise Dialog. Nothing in it indicates anything about any file size. One number in it I have never been able t figure exactly how Adobe come up with and the is Pixel Dimensions Number all others I understand.
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Different file size between Photoshop, and finder/explorer?

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