Hey guys,
I've been asked to get a simple photo of two paintings for a brochure.
The kicker is that it needs to be 350dpi, 9.5x12in.
How does that translate to pixels? Would I be able to do this with a D300 or D3?
If you use math, please show it.
Thanks,
Termina3
You are going to need more pixels then you can get with a Nikon SLR. You can get those by "up scaling" the image in Photoshop but if your client knows what's up and has some experience he will be on to that trick.
How many pixels do you need. Well you answered your own question 350 pixels per inch for 12 inches is 350x12 in the other direction it's 350x9.5 so your final image will be 3325 x 4200 pixels or about 14 "mega pixels" You would actually need a camera with a sensor that is a little larger then that so there is room tofor slight clopping and straighting or to corect out any lens distortions.
The kind of work is NOT typically done with a Nikon/Canon style dSLR. That kind of camera is just not well suited to this kind of work. Your best best is to rent some higher end equipment. You can rent a Mamiya or Hasselblad system for not that much money. These cameras have very large sensors with high pixels counts and have MUCH lower noise and better color fidelity then any Nikon or Canon SLR. Typical specs are 24 to 30 megapixels and a sensor size twice as large as a 35mm film frame.
About lighting. The camera will be very carfully centered over the artwork and very carfully aligned so the lens is exactly square to the plane of the painting. Use two lights each aimed at the centers of the artwork such that the beam of light hits at 45 degrees. Each light will have some right to left or left to right fall off but the two will cancel each other. 45 degrees also will minimise reflections Turn out the other lights in the room or at least dim them way down.
Color balance is very critical here. You have to get it right. But it is very easy. After you are set up replace the artwork with a kodak "grey card" and photograph the card. Adjust the exposure so that the card comes out as an exact mid tone. Shoot a color chart next. Check the histograms see that everything is in bounds and not clipped. Finaly shoot the artwork.
You want to be working in raw format for all of these shots so that you can do tha final color balance on the computer. Getting it right is "way easy" now that you have white, grey and black from your grey and color cards. You can work "by the numbers" looking at pixel RGB values.
The usual way this kind of work is done is with a scanning back on large format camera. I'd suggest that except (1) I've never seen one for rent, (2) A camera like that requires skills a Nikon user is not likely to have while the medium format equipment would seem familiar. (3) the scanning back i better suited to full size reproductions where the final print size is several feet
BOTOM LINE: Use profesional equipment, don't try the "wing it" with consumer sized SLRs. Get the lights "right". Use a color and grey card to get the color balance dead-on perfect.