figured it out for SII!!
I was on this forum this morning lokoing for an answer to this. I couldn't find it, someone else asked about the SII, and I have that, but I did figure it out.
Here's what I did. Before connecting the USB (assuming everything is working there). Go to the Applications/my files/DCIM/Camera
click the options button on your phone (bottom left button that looks like a window icon), click more. Select Move.
Highlight the photos you want to move (by clicking the green check box or select all).
Click move at bottom after you have completed your selection.
Now you're dumped back at the main my files menu.
THIS is where you dump your pictures. really. weird!!
I tried all the other obvious folders 1st (like external sd or usbstorage, and those didn't work).
Then, plug in the phone to your computer. (don't waste your time with media player if that pops up, say take no action).
Open up My computer/SAMSUNG_android - phone/Media
Your files should be in this folder. Then copy and paste them into the directory you choose on your computer.