Why does my Photoshop file have a smaller file size when closed?

Question

My client wants a high res file 1 MB or higher. My Photoshop file (CS4) is 5 MB when I open it in Photoshop (4.5 inches square and 300 dpi)- when I look under Image size. But when I close file it says "875 KB" in my hard drive folder. What am I doing wrong? Client won't accept file until it reads as 1 MB when I email to her as an attachment.

Answer 1

ljmonchik wrote:
My client wants a high res file 1 MB or higher. My Photoshop file (CS4) is 5 MB when I open it in Photoshop (4.5 inches square and 300 dpi)- when I look under Image size. But when I close file it says "875 KB" in my hard drive folder. What am I doing wrong? Client won't accept file until it reads as 1 MB when I email to her as an attachment.
You must have done more then close it. You must have saved over the 5MB file using a lower quality setting so the encoded jpeg image was compress more and you lost some image quality.
Also 4.5x4.5 @ 300 DPI is 1350px by 1350 Px.  I just create two jpeg file for two document that size saving at quality 10. One image was a blank white background it save size was 65KB the other document was a spectrum gradient with a lot of noise added its save size was 3.5MB.  Image content is also very important.  Little detail little file size great detail larger file size.