Why are some pix in KB and others MB ? See screenshot

Also, JPEG looks for repeated areas. A picture of the sky, all blue will make a much smaller file than a picture of gravel. There is no standard size.

If you're referring to the difference in file size reported by the Finder and Photoshop, this is perfectly normal.

The Finder reports compressed size on disk, while Photoshop reports the uncompressed size.

To open a jpg in any application, it has to be decompressed.

Some applications, like ACDSee, will report both file sizes.

I don't do Mac, but are these small files shortcuts of a kind? What do the arrows signify? The file size looks like what you get from a thumbnail.

(just to be clear, "300ppi" doesn't mean it's a big file. A file can be one single pixel and 300 ppi. And as the others imply, jpeg compression level and image content are huge variables.)

Hi Penni,

What version of Phtoshop are you using? Are you on a Mac--what OS are you on?

When you used Save As, what quality did you save them?

Michelle

The file size  depends on the Image Quality you choose when saving.

Moving the slider to 12 will give your file a much larger size (6.1 MB) than 6 (1.5MB,  but will throw out a lot of the picture quality.