Preview & File Size for jpegs problem.Bloating bug?

When adding cover art to iTunes, I am checking the file sizes to be certain I have the smallest size possible to add to my new iPod 16G nano. When connected to the iTunes store and "Get Album Artwork" is selected, I have no way of knowing the size of the images that get installed, except for choosing a song, doing "Get Info/Artwork" then copying and pasting the image in the Artwork window into Preview. Often this Preview image will be identified as around 300+ K in the file size.
So here's the weird part. When I find an image I want, say 240x240 20k file size, I copy it and paste it into Preview and Save As. the Inspector identifies it as 240x240 and 20K in size. In Finder, the file size is identified correctly as 20k. I use this to replace the iTunes artwork that was 350k, by deleting the old image, and using "Add Artwork" in Get Info. The new, smaller image is added. After clicking OK and to check that all is well, I select the song, Get Info, copy the artwork then go to Preview and use "New From Clipboard". Using Inspector, the image is 240x240, but the file size will be huge - 300+K. If I save this copied image and use Finder to check the file size it will be 300+K.
What is going on?

Hello Jody,
Very probably, the final image is exported in the native format for Clipboard: which is, "pict." These pict files are invariably "huge" when compared to a jpeg of the same physical dimension but which is of 72 ppi resolution. In other words, pict files are like .tiff files: they normally are not compressed and consequently are much larger files.
So when you do a "New From Clipboard" - the next step should be "Save As" and then select JPEG as the desired image file format.

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No.
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