Huge file size  grow when using external editor

Hello,
I want to use an external editor such as Photoshop or Pixelmator. When I set one of the applications to be the external editor everytime I open a file for editing a version is created with a file size of approx. 57 Mb.
Any ideas what is going on here?

Lt, it's also worth seeing if you have the setting for the TIFF so that it best suits you.  If you don't require a 16 bit TIFF make sure the it's set to create an 8 bit TIFF instead.  The 57 meg size sounds like a 16 bit image.  An 8 bit one will be half that
.  Before Aperture I used to stay16 bit right up until I passed the image off to whoever it was going to, at which point I'd make them an 8 bit version because that would usually be what they wanted.  But now so much of whatever advantage that brought me (exposure and tonal changes, especially in solid areas) is being done in Aperture, even before creating a TIFF, so it can be argued that for many people the advantage of exporting 16 bit to the external editor isn't gaining them that much.  If it's going to a consumer printer (that is not 16 bit aware) even more so.   16 bit is better, but if size is an issue and Aperture is doing 90% of the global tweaking, I don't think sending the editor an 8 bit TIFF is a crime  :  )  

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