QTR-Quadtone RIP

Hi Mike,

I will probably do 16-bit as some point.  But I really don't think it will
make much difference.  All the ICC internals are already 16-bit and if you
have a 16-bit input file all the profile processing is already done in 16-bit.
The downsizing to 8-bit is done as the last step and its basically just
dithering the output in two stages -- 16 to 8 bit and then 8 to printer data.

Roy

On Sun, Dec 28, 2008 at 9:35 AM, mrmrking <drmrking@gmail.com> wrote:
> Hi Roy,
>
> Do you plan to support 16 bit printing with QTR?
>
> 16 bit printing will allow us to use an ICC profile based workflow
> without losing maybe 5 - 10% of 8 bit tonal values in the conversion
> to print profile.
>
> What I mean by this is that currently when you print with an ICC
> profile the conversion of a 16 bit image in working profile space to
> 8 bit image in print profile space, rounds up or down about 5 - 10%
> of the values, so you lose about 5 – 10% of 8 bit tonal values in the
> conversion. You can see this by just taking an 8 bit target (0-255)
> and converting it to the print profile and seeing what values from 0 –
>  255 you have left after conversion.
>
> If we could print the 16bit image this rounding up or down would
> happen at much higher tonal values, beyond anything that is possibly
> visible.
>
> Epson has released 16 bit drivers on Leopard 10.5  for most of its
> printers. Windows also now has a 16 bit printing path on XP and Vista
> (no Epson drivers as yet).
>
> I hope we can have 16bit printing support in QTR.
>
> Txs,
>
> Mike
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