Re: How do I make a high quality copy of a drawing?
Well, I know what I would do, merely because I am familiar with this particular way of doing so, but perhaps you would not want to do it, or perhaps you may not have the equipment for doing so.
I would eliminate ALL direct light, such as the sun, the sky, a lamp, camera flash, etc., etc.
To do that, I would take the drawing to a covered, outside structure, such as a patio, a front door stoop, a gazebo, etc., etc., and place it face up on the floor of the structure. I would straddle the drawing with my feet, so as to be looking straight down on the drawing with my digital camera. I would set the camera to as full a zoom as I could get it, while still having it fill the view frame. This eliminates the barrel-shape distortion.
I turn off the flash. I take a deep breath, I let my breath out about halfway, and then hold my breath at that point, as I press the button to focus, and then take the shot. I'd take about 3 shots.
I would load it to Photoshop, and square it up, crop it, and, using "curves", I would adjust the contrast/color, etc., until it looked as much like the original as possible.
In lieu of that, I would just scan it, provided it will fit on the scanning window. That is a lot more straightforward, and is just as easily correctible in Photo as a digital photo, and a lot more detailed, and square. Whatever is a bit off in terms of contrast, value, etc. can be easily corrected in Photoshop.