Wiki/website

[Will Stokes]

Thanks Gilles,

Is it correct that the only advantages of "RAW" over TIFF is that:

-the images are unprocessed (no white balancing) and demosaicing has
not yet been applied, thus these types of processing can be done
better in the future on the fly as algorithms improve as you have
access to the vanilla image sensor data.

-the images are 1/3 the size of TIFF's assuming the image sensor only
captures one color channel per pixel (aka you're source isn't a Fovean
sensor).

-Will


On 12/7/06, Gilles Caulier <caulier.gilles at free.fr> wrote:
> 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.
>
> Will,
>
> - 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.
>
> Gilles Caulier
>
>
> >
> > -Will
> >
> > 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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> > Libopenraw-dev at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/libopenraw-dev
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