caulier.gilles at free.fr
Thu Dec 7 07:20:36 PST 2006
On Thursday 07 December 2006 16:03, Will Stokes wrote:
> Writing to DNG will be good enough. In the future I could suport the
> Aperature approach and apply a stack of transformations on the fly,
> but if the user does not have a fancy gfx card this will be painful so
> it will be better if I can save one or more intermediate images in a
> lossless format like DNG. PNG or TIFF would not suffice because as I
> understand it they do not support 16 or 24 bits per channel like RAW
> file formats do.
- PNG support 16 bits color depth.
- TIFF support 16/24/32... bits color depth
Actually, RAW color depth is coded to 12 bits, not 16. It planed for future to
extend camera RAW color depth to 16 bits.
> On 12/7/06, Hubert Figuiere <hub at figuiere.net> wrote:
> > Will Stokes wrote:
> > > Hubert,
> > >
> > > Just thought I'd let you know another developer is lurking on this
> > > list. I'm excited about what you're up to and look forward to ditching
> > > my fork of some dcraw code and use libopenraw exclusively for both
> > > getting thumbnails (what I do currently) as well as reading and
> > > writing to raw file formats (something I'm intrested in in the future.
> > writing to RAW files ain't gonna happen. Unless it is DNG, for the sole
> > purpose of offering conversion to DNG (even if I still consider it
> > unreliable enough as it does not resolve the undocumented RAW issue, but
> > just hide it)
> > > I'm also curious about something. I'm not sure how rational this is,
> > > but as many know ijg's libjpeg supports some nifty fast transforms and
> > > scaling operations. I doubt the latter is possible with raw file
> > > formats, but perhaps rotations and flipping could be made ultra fast
> > > as well?
> > The only transformation libopenraw will offer is processing the RAW data
> > (usually CFA) to a RGB pixmap.
> > Hub
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