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"I’ve been photographing my own work and selling prints for years. It can be a very complicated process if you are going for an accurate reproduction, but it doesn’t necessarily have to be expensive. Here are a few tips:
shoot in a large room with lots of light (if you have access to a school classroom, this works really well) or outside during the day in the shade.
use a camera with optical zoom or removable lenses (you can pick up an older canon rebel for pretty cheap)
use a tripod and shoot at iso 100 and f/8, and then adjust the exposure until you get a well exposed shot (use the 2 second timer setting so you don’t shake the camera)
shoot in RAW format with auto white balance, since you can adjust the white balance later if you need to (don’t shoot in jpeg). Take one shot with a gray card in the image as it will allow the editing software to get the right white balance.
use a polarizing filter. This is actually one of the most important tools as it’s almost impossible to not get any glare without it, especially in the darker areas of the artwork. Take 5 or more photos, each time, rotate the filter a little bit, that way you can choose the one that cuts out the most glare after.
use editing software to crop and adjust the colours. You don’t necessarily need expensive software like Photoshop, though that is what I use.
Those things should give you quite good results.
Extra tips for even better results:
stack all the images you took with the polarizing filter in photoshop and set the layers to “darken”. This will take all the darkest parts of the images and combine them together to get rid of even more glare
repeat the entire process with the painting upside down. Stacking these images on the right side up images (obviously flipped to line up) will get rid of even more glare.
use a colour correcting card like Color Checker to get even more accurate colours. I find blues and greens don’t photograph well, so this helps a lot.
It’s taken me many years to develop a process that gives me accurate results, so hopefully some of these tips can help others 😊"