Timeline for What happened to Foveon sensors?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 13, 2017 at 12:44 | history | edited | CommunityBot |
replaced http://photo.stackexchange.com/ with https://photo.stackexchange.com/
|
|
| Apr 10, 2011 at 23:37 | comment | added | Kendall Helmstetter Gelner | I did focus on the human vision color space, I said "2/3 of the visible wavelengths" are discarded. The simple fact is that for any one output pixel from a bayer image only one of red, green, or blue spectral data was recorded, the remaining wavelengths were all blocked by the bayer filter and the pixel has to get the rest of the color data from surrounding pixels. | |
| Apr 10, 2011 at 11:59 | comment | added | mattdm | @Kendall: but calling it "2/3rds" is a little deceptive. Clearly, we're not recording all of the electromagnetic spectrum no matter what. So, focusing on percentage of the human vision color space covered seems much more realistic. | |
| Apr 10, 2011 at 7:47 | comment | added | Kendall Helmstetter Gelner | Also of note is that relying heavily on the observed theory that green spatial resolution is more important than blue/red resolution, leads to the generation of images that appear sharper but are less accurate. There is a tradeoff in any kind of compression of data, and throwing away 2/3 of the visible wavelengths for any given spatial location in an output image is most definitely a form of pre-image-compression not even the use of RAW formats can work around. | |
| Apr 10, 2011 at 7:43 | comment | added | Kendall Helmstetter Gelner | I don't really think it's relevant to compare a medium format body in any with a 35mm body, they would be used in wholly different ways anyway... I just wanted to note that while the sensor shifting is one way to potentially address the issue even for smaller cameras, that it has real drawbacks. | |
| Apr 10, 2011 at 6:58 | comment | added | Jerry Coffin | @Kendall: yes, the sensor shifting approach has only limited application. It's worth noting, however, that their current top of the line has an 80 megapixel sensor, so resolution is pretty decent even without sensor shifting. | |
| Apr 10, 2011 at 6:29 | comment | added | Kendall Helmstetter Gelner | Note that the phase-shifting approach is really only practical for still subjects. There is a lot of value in gathering all data at once. | |
| Apr 9, 2011 at 23:45 | comment | added | Mark Ransom | Early Sigma cameras used JPEG compression settings (subsampling) that didn't show their sensor to the best advantage, but they fixed this. I wish I could remember where I had seen a quite graphic demonstration of the problem. | |
| Apr 9, 2011 at 19:32 | history | edited | Jerry Coffin | CC BY-SA 3.0 |
deleted 8 characters in body; added 8 characters in body
|
| Apr 9, 2011 at 19:25 | history | answered | Jerry Coffin | CC BY-SA 3.0 |