Photoshop Save /File size estimate

Hi
I have a very silly issue that I am sure Ive either unset or has a simple solution. I am using Windows 64 bit photoshop cs5
When I go to file save as and specify JPEG as the file format. The file size estimate does not show anything. I can leave it for ages and it will not display the file size estimate.
Is this a setting that needs to be re-enabled? If so, could a kind soul point me the right direction please
many thanks, all the best
Neil

Zeno has explained it and provided a workaround, but the simple fact that the dialog does not provide an estimate where it should be is really a bug. I reported it a long time ago.
-Noel

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mscriv wrote:
So, I'm using Aperture 2 and I've got some questions about exporting from RAW to JPEG. I shoot with a Nikon D70 so original RAW files are 5-6mb in size. After doing some basic post processing when I export the pics at "full size" with picture quality of 11 out of 12 then the resulting JPEG is about half the file size of the original RAW file. For example a 5.6mb RAW becomes a 2.6mb JPEG. The resolution in pixels per inch and and the overall image size remain unchanged. Have I lost picture quality due to the exporting JPEG being smaller in file size?
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My friend who works with me prefers to edit in Photoshop and when he follows the same workflow his saved JPEG from the identical RAW file in Photoshop is minimally smaller in file size, say 5.6mb to 5.3mb. He's telling me that my Aperture edited photos are losing quality and resolution.
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I tried changing the picture quality in the export menu to 12 out of 12, but the resulting JPEG then becomes larger than the original RAW at over 7mbs. Can someone please help me understand this better? I don't want to lose picture quality if that is indeed what is happening.
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Perhaps the engineers should take time to read the Assett guide. As yet I have not found any engineers posts advising other than the assett guuide.. do you have a link for any?
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Photoshop Save /File size estimate

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