cathoderaydude
patreon
Oops
🕑 Added 2024-06-26 02:18:06 +0000 UTCThanks to an attentive viewer, I have been informed that I got the entire explanation of Bayer color filters wrong in the gray scanner video. This does a tremendous amount of damage to the narrative and I will probably have to reshoot a big chunk of it. Just wanted to let you know, in case anybody else notices it and wants to point it out; there will be a new version of the video sometime in the next couple days.
Thanks go out to that viewer and everyone else who has corrected me over the years, I would look a lot dumber without your help.
Comments
Aaron Ladd
Another rabbit hole using the same style of sensors are Line Scan cameras used in racing sports timing. they do use a lens, but require special software to use. And the cameras cost more than a new car. I have experience with a brand called finishlynx
Cathode Ray Dude
The error is subtle until you realize what it implies. The whole bit about needing four times as many photosites to make a color sensor? Completely wrong. I was under the impression that Bayer sensors all do pixel-binning; that each pixel in the finished image is the product of four photosites, and thus it contains luma averaged across those four points, then color interpolated based on a complex matrix. The reality is that if your camera outputs a 4000x3000 jpeg, the sensor only has that many photosites. There is no binning going on, just a ton of interpolation. If you look at the pixel at (5,5) in the un-debayered raw, you'll see a red, a green, or a blue channel that was captured at (5,5) on the sensor, and that's it. That color channel is interpolated into the pixels around it, and the other two colors are derived from pixels around it.
Funkmon
I'm a photographer and I think you got the Bayer filter thing right in the vibes. The Bayer filter does let only one color of light through and must be demosaiced. Black and white sensors are therefore pixel level sharp and more sensitive to light, and so are Foveon, at least as far as I know. For your explanation to be so wrong so as to require a substantial rewrite is shocking to me. I am interested to see the difference.
