Until this point luma and chroma uses the same image as key and fill image, but both can use different image as key and fill source, at the point we have understood the keyer principles this is explained very simple: Luma Key: it’s a little bit like chroma keys, but creates the mask/transparency not from color but from luminance, so you define a threshold luminance and all parts of the key image that are brighter will still be visible and the rest ist transparent to see the underlaying image at this points. so you generate a mask from an specific color out of the keyer image on the fly.ģ. Simple said a chroma key defines a color, and this color is set to transparency in keyers image. Chroma Key: the principle of a chroma is what you possibly know from the green- or blueboxes of weather news or movie filming. Of course there are ways to create more complex masksĢ. You see the possibilities are limited, because you only have very basic and simple pattern to generate transparency, let us call this pattern a mask because it masking the key image to define at which part of the final image you will see the overlay (keyer) image and ok which part you can see the underlaying (original) image. Mostly that are simple pattern, like rectangles, rombus or circles. Pattern Key: Cut out some pattern to see parts of the original image, where the pattern is. But you don’t want to cover all of the original image by the key image, for this there are different methods to create transparencies in the key layer (the different types of keyers)ġ. Keyers are basically like putting some image in top of the other, a little bit like additional layers. Ok, I’ll try it, first the function of Keyes’s in general: R/talesfromproduction All your weird stories R/LocationSound Location sound AKA Production Sound ![]() R/audiopost For post-production sound geeks in Games, TV, Film, and Broadcast r/crestron All that is good (and bad) in the world of Crestron r/broadcastengineering Also includes radio! ![]() r/CommercialAV Commercial audio, video, and control technologies If you have any questions or suggestions please feel free to messsage the moderators! We would love to make this a great and successful subreddit for all of us video engineers! Remember that no question is stupid and we work together to create a friendly community. All things video are welcome!įeel free to post anything you like from questions to pictures. From a dad with a camcorder to a professional engineer at the superbowl, or a small meeting room operator to a widescreen specialist, projectionist, LED wall engineer or a electrical video engineer. This subreddit is open to anyone to discuss, share and show their work, as well as ask questions towards anything concerning video production. Welcome to r/videoengineering! Inspired by our brother subreddit: audioengineering
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