Sigma/Foveon Questions
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From: Ray Fischer on 17 Apr 2010 20:51 Chris Malcolm <cam(a)holyrood.ed.ac.uk> wrote: >Ray Fischer <rfischer(a)sonic.net> wrote: >> Chris Malcolm <cam(a)holyrood.ed.ac.uk> wrote: >>>Ray Fischer <rfischer(a)sonic.net> wrote: >>>> Bubba <digitalrube(a)yahoo.com> wrote: >>>>>I don't understand how a sensor can claim 14 pixels, and the photo >>>>>itself be 4. >>> >>>> That's easy - Sigma lies. They pretend that you can take a single >>>> pixel and split it up into three colors and have that be three pixels. >>> >>>They don't lie. It's a different kind of sensor with sufficiently >>>different kinds of pixels and properties that the sensor megapixel > >> They lie. > >> When you measure the size of the image it produces you see that it is >> 4.6 mega pixels. That is the cold, hard fact. No amount of sophisty, >> lies, or self-serving bullshit will alter that fact. > >Of course it doesn't. But I was talking about the image implications >of that fact. There aren't any. Sigma lies. > People are using image MP as a measure of image >quality. People do all manner of stupid things. That doesn't justify lying. -- Ray Fischer rfischer(a)sonic.net
From: Alfred Molon on 18 Apr 2010 12:19 In article <170420101740032851%nospam(a)nospam.invalid>, nospam says... > 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. Note that red and blue channels are very poor estimates of luminance. To properly capture luminance at each pixel you need the full colour information at each pixel. -- 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 12:22 In article <MPG.26354f96de0fa53d98c2a1(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> 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. Note > that red and blue channels are very poor estimates of luminance. wrong. every pixel captures luminance. > To properly capture luminance at each pixel you need the full colour > information at each pixel. wrong, as bayer has proven.
From: Ray Fischer on 18 Apr 2010 14:25 Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <170420101740032851%nospam(a)nospam.invalid>, nospam says... >> 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. But notice how many cameras have 4.6MP Bayer sensors. >To properly capture luminance at each pixel "Properly" according to whom and by what standard? -- Ray Fischer rfischer(a)sonic.net
From: nospam on 18 Apr 2010 14:36
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 certainly not 1/3rd or whatever other silly math the foveon fanbois claim. > 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%. > >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. |