ive cropped out a bit of some, but i dont have any experience when it comes to printing pics.
does the printer hardware automaticaly resize it to fit the size your trying to print? im completly new to all of this.
If you use photoshop or other image editing software, then you select the crop tool, you can specify a particular size, like 4x6, then it will give you a box, which maintains the correct ratio and you can drag it over the portion of the frame that you want.
4x6 will pretty much be your whole shot, unless you want to crop a smaller area. 8x10 however, will cut off some 2 inches on the long side, why these two different ratios became the two standards is beyond me.