My Nikon D90 dumps out photographs that are 4288 x 2848 @ 300 DPI. They're about ~3 MB in size.
I'm an amateur in every sense of the word. I don't know what 75% of the camera settings do.
I'm wondering if there any rules of thumb in the industry when it comes to compressing these images down. I've got about 100 GB at this point and really need to start compressing them to save space. The storage service I'm using can't really go any higher than that without costing large fees.
At the same time, I don't want to lose a lot of quality. Once I compress them, and lose quality, there's no way of going back.
I was hoping this community of experts could offer some advice as to what is usually tolerated in terms of lost quality. Any software apps that deals with this concern? I found a couple of one-off apps that optimize (like this one), but no recommendations on how low to go.