NEW DP QUATTRO is coming!!!!!!!!!!!!!

Started 10 months ago | Discussions thread
ChristianHass
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Re: NEW DP QUATTRO is coming!!!!!!!!!!!!!
In reply to DMillier, 10 months ago

DMillier wrote:

I'm struggling a bit to figure out how it works.

The old Foveon was simple to understand: 3 layers, 3 photo sites per spatial pixel, each photo site stacked exactly above the other. Equal resolution for all colours, no demosaic artefacts, no colour aliasing. Downsides were noise, funny colour response that needed clever fixing.

Bayer is complicated: twice as many green photo sites, no pixels co-located at the same spatial position, every spatial pixel value having to be computed based on many measurements from surrounding photo sites and lots of clever processing. Quite efficient use of photo sites, unequal colour resolution, low level demosaic artefacts, low noise, high dynamic range.

This new Foveon is unique. 20MP in the top layer, only 5MP in the second and third layers. That a big colour channel difference. How are they going to overcome that? The only similarity with old Foveon seems to be silicon filtering (which was the bad bit about Foveon!). What will this means for spatial resolution - will it be somewhat like Bayer where the per pixel average resolution is lower than the spatial pixel count? Will an 20MP quattro have less resolution than a 20MP X3 Foveon? What about colour resolution? Is is still going to be equal across all colours? Will foveon fans stop demanding the use of colour resolution charts in future reviews? What about subtle colour gradation, will this be retained? What about artefacts? Will the new quattro layout mean there will demosaic like artefacts?

Can someone walk through how this new architecture actually works? Roland? Anybody?

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From what I can gather it works on the same basic principle as the X3 sensors, but the resolution in the second and third layer are 25% of the top layer resolution. This means that for each block of 4 blue photosites there is only 1 green and 1 red site which will provide the green and red input for all 4 photosites.

This should give less noise in the green/red channels due to larger photosites, but it will of course give less color resolution. The conversion will not be as clear cut as with the X3 sensors where you had distinct color input for every photosite, but I'm guessing the overall penalty for reducing the red/green color resolution is smaller than the gains in luminance resolution and ISO noise.

Having 30 million photosites instead of 45 million to collect and compute will also mean less power drain and faster writes.

Of course this is all based on what I've been able to gather this morning, so I might be completely off, but I don't think I am

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