Sigma/Foveon Questions
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From: Ray Fischer on 18 Apr 2010 15:19 nospam <nospam(a)nospam.invalid> wrote: >In article <4bcb4eb1$0$1610$742ec2ed(a)news.sonic.net>, Ray Fischer ><rfischer(a)sonic.net> wrote: > >> >> the luminance resolution is about the same as another 4.6 megapixel >> >> sensor (alias artifacts is not resolution, it's false detail) and the >> >> eye can't see the extra chroma resolution. >> > >> >Only if you capture black and white scenes, otherwise it is lower. >> >> A 4.6MP bayer sensor does indeed have lower resolution than does a >> 4.6MP foveon sensor. > >slightly. It's significant. >it's certainly not 1/3rd or whatever other silly math the foveon >fanbois claim. It is actually not too far from 1/3. >> But notice how many cameras have 4.6MP Bayer >> sensors. > >and then look at how many have foveon. it's not even 1/2 of 1%. Not the point. The point is that cameras with Bayer sensors are generally 10MP or more, easily outstripping any benefits seen from the Foveon sensor. >> >To properly capture luminance at each pixel >> >> "Properly" according to whom and by what standard? > >a made up standard that doesn't matter to human vision. -- Ray Fischer rfischer(a)sonic.net
From: nospam on 18 Apr 2010 15:43 In article <4bcb5b3b$0$1636$742ec2ed(a)news.sonic.net>, Ray Fischer <rfischer(a)sonic.net> wrote: > >> A 4.6MP bayer sensor does indeed have lower resolution than does a > >> 4.6MP foveon sensor. > > > >slightly. > > It's significant. no it isn't. > >it's certainly not 1/3rd or whatever other silly math the foveon > >fanbois claim. > > It is actually not too far from 1/3. it's approximately the same. both bayer and a foveon sensor with the same number of pixels will resolve approximately the same, roughly 70-80% of nyquist. beyond that you either get alias artifacts (aka false details) or no details, because the aa filter blocks it since the sensor would alias. > >> But notice how many cameras have 4.6MP Bayer > >> sensors. > > > >and then look at how many have foveon. it's not even 1/2 of 1%. > > Not the point. The point is that cameras with Bayer sensors are > generally 10MP or more, easily outstripping any benefits seen from > the Foveon sensor. that's true. the best foveon sensor is still 4.6 megapixels, while bayer is 18-24 megapixels.
From: Alfred Molon on 18 Apr 2010 18:03 In article <180420100922201916%nospam(a)nospam.invalid>, nospam says... > wrong. every pixel captures luminance. No. In a Bayer sensor every pixel captures either the red, green or blue channel. This is NOT luminance. > > To properly capture luminance at each pixel you need the full colour > > information at each pixel. > > wrong, as bayer has proven. No - you are wrong. -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
From: nospam on 18 Apr 2010 18:08 In article <MPG.2635a0118e4698e198c2a2(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > In article <180420100922201916%nospam(a)nospam.invalid>, nospam says... > > > wrong. every pixel captures luminance. > > No. In a Bayer sensor every pixel captures either the red, green or blue > channel. This is NOT luminance. it's one component of the luminance, with the remaining two later calculated. > > > To properly capture luminance at each pixel you need the full colour > > > information at each pixel. > > > > wrong, as bayer has proven. > > No - you are wrong. so all of the zillions of photos that very accurately reproduce the subject all have completely bogus luminance? how can that be? here's a clue, bayer works, and it works very well.
From: Ray Fischer on 18 Apr 2010 19:00
Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <180420100922201916%nospam(a)nospam.invalid>, nospam says... > >> wrong. every pixel captures luminance. > >No. In a Bayer sensor every pixel captures either the red, green or blue >channel. This is NOT luminance. So it can't tell how bright the r, g, or b is? Really? >> > To properly capture luminance at each pixel you need the full colour >> > information at each pixel. >> >> wrong, as bayer has proven. > >No - you are wrong. He's obviously not wrong as the existence of billions of images captured with Bayer sensors will show. -- Ray Fischer rfischer(a)sonic.net |