Tags camera-matching, ENG Essentials, ex3, hpx3700, pmwex3, video, white-shading
This is the first part of the ENG Essentials – Camera Matching series, and the first step to matching two cameras. White Shading is an in-camera process where a lens is matched with a camera’s sensor. Every lens and every sensor have unique characteristics, and the combination will often produce uneven color across your image. White shading corrects for this uneven color by adjusting individual color channels (R,G,B) from top and bottom and from left to right. This is done with a Leader waveform monitor and a white sphere that is designed to produce even white light.
Another important step after white shading a camera is to match white balance values. All pro cameras have preset and user defined white balance values – the P,A,B switch. If you run a white balance on two cameras looking at the same white card, in the same lighting environment, you will get very similar results. But if you plan to use the preset values (3200K,5600K) we need to be sure that both camera actually produce the same color white. Different lenses produce different white values, so even though the camera thinks you are at 3200K, it may be completely wrong. This can be corrected for by adjusting offset values in the camera, and making sure that both cameras have matching white values.
Watch my video below to see how these two steps are done.