Re: BCP or no BCP to epson without rip
Re: BCP or no BCP to epson without rip
- Subject: Re: BCP or no BCP to epson without rip
- From: neil snape <email@hidden>
- Date: Wed, 10 Jun 2009 11:30:57 +0200
- Thread-topic: BCP or no BCP to epson without rip
on 10/06/09 11:18, Augusto wrote :
> Doubting the quality of my profiles as I always can see a change in
> perceptual when BPC is on or not, I pick up one of B. Atkinson's profiles,
> which are some of the most meticulous done profiles that I know. I opened an
> aRGB image run a proof preview and could see the same changes as with my
> profiles when turning BPC on and off. To further puzzling, these profiles
> (Atkinson's) are recommended to convert perceptual without BPC, why?
> Augusto
As others have said it has to do with how the creating application maps the
colour ( which is more rightly TRC tone response curve) how the black point
is mapped, and how it is reported if so.
Bill Atkinson uses many applications to create his profiles he so kindly
shares. Some of them must benefit from no BPC then if it is stated to do so.
Even though ICC specs require a certain standard for relative, perceptual
mapping is up to the vendor as long as it is ICC specification compliant for
the profile tags etc.
Few of the commercial have implemented source colour space assumed or other,
be considered in output or destination profile creation. Argyll does if I
remember right. In this case it¹s a better mouse trap, but unfortunately we
have to live with the pesky BPC in the perceptual rendering dialogue box
which is rarely useful outside of as Steve said input profiles with a non
zero black OR old, very old profiles without black point mapping built in
/bad profile creation tables etc.
Neil Snape
_______________________________________________
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