Simon:
Some basic info might help solve your problems...
Assume your design will be printed at 300 dpi (or 300 ppi. Same thing). dpi is short for dots per inch (ppi = pixels per inch). This means that every 1x1 inch square will be 300x300 dots (or pixels). In your case, this means your 2100 x 1800 design, printed at 300 dpi, will be 7 inches by 6 inches.
In photoshop, when you first set up your canvas, all you need to do is set it to these dimensions (7 inches x 6 inches @ 300 dpi) and you should be all set. Print it up on paper & measure, to play it safe.
Hope this helps!
Gates
Some basic info might help solve your problems...
Assume your design will be printed at 300 dpi (or 300 ppi. Same thing). dpi is short for dots per inch (ppi = pixels per inch). This means that every 1x1 inch square will be 300x300 dots (or pixels). In your case, this means your 2100 x 1800 design, printed at 300 dpi, will be 7 inches by 6 inches.
In photoshop, when you first set up your canvas, all you need to do is set it to these dimensions (7 inches x 6 inches @ 300 dpi) and you should be all set. Print it up on paper & measure, to play it safe.
Hope this helps!
Gates