Dynamic range and RAW file "bit depth"

Started Jan 25, 2014 | Questions thread
Iliah Borg Forum Pro • Posts: 24,775
Re: Magic Lantern & analog clipping

xpatUSA wrote:

Jack Hogan wrote:

Iliah Borg wrote:

Jack Hogan wrote:

Iliah Borg wrote:

what work needs to be done in the raw converter to be able to correctly deal with the less well defined saturation level?

Linearization, normally, based on photon transfer curve. Pretty heavy equipment needed if doing it precisely for that small highlight region; but in practice just three points, the start, the saturation, and some midpoint, using a spline. The other thing necessary is to deal with pattern noise, also not a huge problem.

If the curve near actual FWC is easily characterized, why doesn't everybody do it?

It is per camera characterization.

I see, so not very practical for mass production houses like Canon and Nikon I guess.

Looks like Sigma does it, or used to:

Type=0 (long), Dimensions=2 (Channel, InputVal) (3x4096)
<big matrix skipped>"

Yes, they use look-up tables for linearization.

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