Re: Decent results with Gutenprint - the poor man's RIP
Re: Decent results with Gutenprint - the poor man's RIP
- Subject: Re: Decent results with Gutenprint - the poor man's RIP
- From: Stephen Lawrence <email@hidden>
- Date: Sat, 24 Jun 2006 18:44:14 +0100
Graham Gill wrote:
For much work, 8 bits per component is entirely adequate, if it is in
a well behaved color space. If the printer driver doesn't have
appropriate
linearisation curves to 12 or 16 bits internally, and the profile
is exposed to most of the extreme dot gain that high resolution inkjet
printers natively have, then yes, you've then got to push back 12
or 16
bit precision into the profile (and the profile quality is
generally compromised if it has to cope with extreme channel
non-linearity). So if you are saying that Gutenprint needs
16 bits/component input to get good results, then I see that as a
Gutenprint problem. It needs some decent calibration curves for
each printer.
Yes, that was my experience engineering inkjet printer driver colour
systems for my previous employer. Sure you want greater than 8 bit
internally for a few key areas. I found that typically somewhere
around 10 to 12-bits were required in the dot gain correction and
halftoning for the reasons you explain. But for input to the driver
and generally internally 8-bit produces great output assuming the
input image is good. Its a case of using the appropriate bit depth
where needed. For example, going too 16-bit internally can be very
painful in some circumstances. The large memory foot print that would
be required for a halftoning mask would be one example that springs
to mind.
Best Wishes,
Steve
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden