Sam Siciliano asked the following question...
Gary, I tried using the alternate 'save for web' rather than 'save as', but I ran into many memory issues. I'm not exactly sure what is going on. I'm running Windows XP, and I have about as much usable memory as possible with that OS. I have 4G, of which about 3.2G is addressable. Photoshop Preferences shows that it can get up to around 1.6G, and I set the level up to 1.2G, which it seems to recommend. However, I keep getting warning messages pop up when I try to view jpegs in 'save for web' 2-up. Forget 4-up! If I lower the percentage (of which I'm not sure) and start shrinking what is displayed in the windows, I have better luck.
I wondered if the sheer size of my files is creating a problem. My Sony full-frame has one of the biggest sensors available, and my raw files are around 33M. When I save a psd file in CS5 in 16-bit mode with that Prophoto RGB color profile and with even a couple layers, I get files of about 350M! This does seem rather huge to me. When I was using Photoshop Elements, 8 bit, and default sRGB, my files were only around 150M. However, I had memory issues with 'save for web' there as well. Anyway, I'll try to bring in a file to try on the class PCs, but let me know if you have any ideas or suggestions!
You actually are asking a real good question here…
Divide the width of a picture in pixels by the # of pixels per inch (PPI) --the value you told the printer to print per inch
EG from the data in the above requester
3456 pixels / 300 pixels per inch
= 11.52 inches
2304 Pixels / 300
Pixels per inch