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Step 5Lighting Calibration
Once your projector and camera are arranged, the lighting needs to be considered.
Turning out the lights
Structured light is fairly strong against ambient illumination, but it will help to turn off as many lights as possible. That way only the projector is illuminating the scene.
Once the lights are out, make sure your projector isn't clipping the blacks or whites. Use a calibration pattern like the one from this Monitor Gamma Test, or the pattern attached below, while adjusting the "contrast" and "brightness" settings on your projector. Then adjust the white balance and exposure of your camera to make sure the whites aren't clipping. If your subject is close to the projector, the brightest white will be brighter than when your subject is further from the projector due to light intensity drop off.
Exposure Time Issues
You might find that the images from your camera look colored, even though you're projecting a black and white image. This is because your projector has a color wheel and you're capturing less than a full frame of the projection. To solve this, lower the ISO (decrease the sensitivity) and increase the exposure time of your camera to at least 1/60th of a second. If the whites are clipping, you have to either put a neutral density filter on the camera or move the scene away from the projector.
Eye Safety
Before you step in front of the projector, remember: it's bright, and retinal damage is irreversible. If you want to do bust scans, keep your eyes closed.
Turning out the lights
Structured light is fairly strong against ambient illumination, but it will help to turn off as many lights as possible. That way only the projector is illuminating the scene.
Once the lights are out, make sure your projector isn't clipping the blacks or whites. Use a calibration pattern like the one from this Monitor Gamma Test, or the pattern attached below, while adjusting the "contrast" and "brightness" settings on your projector. Then adjust the white balance and exposure of your camera to make sure the whites aren't clipping. If your subject is close to the projector, the brightest white will be brighter than when your subject is further from the projector due to light intensity drop off.
Exposure Time Issues
You might find that the images from your camera look colored, even though you're projecting a black and white image. This is because your projector has a color wheel and you're capturing less than a full frame of the projection. To solve this, lower the ISO (decrease the sensitivity) and increase the exposure time of your camera to at least 1/60th of a second. If the whites are clipping, you have to either put a neutral density filter on the camera or move the scene away from the projector.
Eye Safety
Before you step in front of the projector, remember: it's bright, and retinal damage is irreversible. If you want to do bust scans, keep your eyes closed.
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