DPReview.com is closing April 10th - Find out more

"Less Megapixels = Better Color"...

Started Oct 9, 2018 | Questions thread
(unknown member) Forum Pro • Posts: 16,732
Re: The role of demosaicing ?

tokumeino wrote:

57even wrote: [...]

Firstly, the colour filters cover a range of wavelengths. There is quite a lot of overlap between red and green and green and blue. So it is possible to correlate a neighbouring green-red pair with another green-red pair to refine the probable red/green ratio. It's just more computationally intensive, and needs to look at a larger sample of pixels. It also requires a two-pass technique (at least) rather than 1 pass. [...]

Thanks for taking time to explain. In particular, I didn't realize the point above? By using Darktable, I never really undertood the difference between Markesteijn n-pass. I guess that this is what it is about.

I guess that LR does make use of VNG, right ?

I think it has more to do with resolving edge artefacts - as clearly visible above. I think there is something similar going on in X-trans demosaicing, but I don't know what the specific technique is, or how closely it's related.

-- hide signature --

Reporter: "Mr Gandhi, what do you think of Western Civilisation?"
Mahatma Gandhi: "I think it would be a very good idea!"

Post (hide subjects) Posted by
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow