WHAT ARE GRAINS & HOW THEY CAN BE REDUCED. – MEFA
Grains are unwanted noise in a motion picture by the reason of low light.
Grains in any other profession can mean something else, like in Agriculture. But here in cinematography, it is the restless tiny rasters that appear on the screen over the composed frame of picture. Grains or noise as it is called by some professionals, appear on a picture due to absence of adequate light on the environment that is seen in the frame. It actually takes a critical look at a picture to discover grains in many case. But it is easily known when a local TV station is not properly set for clear signal. What you see is called grains or noise.
I will like to explain my point with an analogy from an exterior shoot. In an exterior day shoot, It is very rare to experience grains under the influence of adequate daylight. The picture is clean and clear. But shoot exterior night or continue shooting exterior day at a time when daylight has given up for night can introduce grains to your picture.
Grains is not noticed when the gain in broadcast cameras or ISO in DSLR or ASA in some cine cameras is lower enough to hide it. But it is obvious when you are trying to push up the gain beyond the strength of the camera’s best, instead of adding light.
Ofcourse, camera’s lowlight strength differs, but no camera is free of grains.
How do you prevent/reduce grains?
1. Maintain a good light intensity that can bring out the best of your camera.
2. Avoid pushing up gains unnecessarily
3. Always check your picture at any increase in your gain
Conclusively, your camera eye is not like your eye, looking at a street brightly beautiful with street light in your eye might still be grainy in your camera, when you try to make the camera see what your eye sees by pushing up gains. I tell you, the use of 10k hmi light, 20k hmi light in big project is not a joke, no wonder there pictures are cleaner and grains free even at night shoot.
I urge you to produce a clean motion picture too, avoid grains, avoid unnecessary gain up, avoid lowlight. Light your three elements of frame appropriately and proportionally.
Post written By – Kunle ADEPOJU (Click Here to read about the writter)
Post copied From – MEFA Facebook Page. (Click Here to like MEFA page on Facebook)
Published on this website By: Ifeoluwa ORISAKAHUNSI