Re: Which free software could acquire 48 bits color depth pictures from a scanner ?

Alan Browne <alan.browne@xxxxxxxxxxxxxxxxxxxxx> wrote:
John McWilliams wrote:
Ray Fischer wrote:
nospam <nospam@xxxxxxxxxxxxxx> wrote:
NeilMolon

I guess that's why everyone is raving about CS4 finally supporting
some 32-bit
math in some of its functions.
actually they're raving about cs4 being *64 bit*.

Too many people with too little understanding.

32-bit pixels is different from being able to handle a 64-bit address
space. Whining that PS cn't do 32-bit pixels for all functions is
silly given that there's no output device that can handle even a
16-bit range.

I print to an Epson 3800 in 16 bit mode out of Lightroom. But I also get
your point about whining.

The point about data precision in PS is not about output. It is about
conserving information over a few to dozens of transforms (operations)
of the data without introducing artifacts due to LSB losses or padding
in each transform such that when the data is eventually reduced to the
dynamic range of the output, all (or at least most) processing artifacts
are lost in the truncated or rounded data only in that very last operation.

And I would like to point out that the MINIMUM precision the PS allows
is 24 bits, or 8 bits per channel. And the fact that one can print
16-bit/channel images doesn't mean that the device provides anywhere
near that big a range of colors.

--
Ray Fischer
rfischer@xxxxxxxxx

.

Relevant Pages

  • Re: Which free software could acquire 48 bits color depth pictures from a scanner ?
    ... Whining that PS cn't do 32-bit pixels for all functions is ... It is about conserving information over a few to dozens of transforms of the data without introducing artifacts due to LSB losses or padding in each transform such that when the data is eventually reduced to the dynamic range of the output, all processing artifacts are lost in the truncated or rounded data only in that very last operation. ...
    (rec.photo.digital)
  • Re: Vector3.Unproject - Incorrect return value
    ... > pixels up, the atoms should move 10 pixels up. ... > I capture the mouse position, which is in screen coordinates, and put it ... > I am sure that I initialized my device and transforms correctly. ...
    (microsoft.public.win32.programmer.directx.managed)
Loading