theogt;2571626 said:
These were in JPG. Space was more of an issue at the time -- I took a couple thousand photos on that particular trip, filling up multiple SD cards.
Does raw make a big difference?
Yeah. JPG is a compression format and shouldn't be used if you're going to do anything further with the image. It's basically an end product for something that will not be edited again and most definitely never be sized up.
With Camera RAW, you have plenty of options and it's most important in your conversion from the start. You do need Photoshop, though, with the CR plug-in, which is free. When you open it in Photoshop, you're presented with the Camera Raw window and all the settings...
There you set the Max resolution and image and color correction, sharpness, etc.
Like I said earlier, a lot of the consumer Digital SLR's are not full frame (the digital equivalent of 35mm), so printing big won't be perfect, but you can get some very good stuff from them, using Camera Raw. Your particular camera can definitely get you nice prints at that size you mentioned.
Just don't do it from a JPG.
Also, RAW is not an end Format either.
You'll have to save the file as something else when you're done. Tif, Photoshop, or final JPG. I know space is an issue, so you'll have to consider you'll have two files of the same image: the RAW, (digital negative) and the processed file.