Re: ColorBurst RIP update
Re: ColorBurst RIP update
- Subject: Re: ColorBurst RIP update
- From: Steve Kale <email@hidden>
- Date: Wed, 06 Dec 2006 22:15:14 +0000
- Thread-topic: ColorBurst RIP update
Terry - thanks very much for that. Sounds like I can pick up the new
version of Colorburst and do my own Lab linearization and subsequent
profiling using my existing spectro without too many difficulties.
> From: Terry Wyse <email@hidden>
> Date: Tue, 28 Nov 2006 15:35:17 -0500
> To: ColorSync User List List <email@hidden>
> Subject: Fwd: ColorBurst RIP update
>
> Below from Larry Spevak of ColorBurst Systems. He asked if I wouldn't
> mind forwarding this to the list to clear up any confusion.
>
> Regards,
> Terry Wyse
>
> Begin forwarded message:
>
> Regarding ColorBurst's requirement for a UV Cut Filter. All of our
> Lin files and Profiles are made with a UV Cut DTP70. Until recently,
> all of our media Profiles were built using a Chroma Linearization.
>
> The UV Cut filter is used because in the event that a media had any
> UV response, during Linearization, the Yellow would reverse between
> Paper White and the 5% to 10% patches. The Paper White would have a
> Blue Chroma, then at 5% Yellow, the a Chroma is near 0 and at 10% and
> beyond, there's a Yellow Chroma. If there's no UV filter, the
> resulting Profile does have problems in the highlights.
>
> Therefore, if you are relinearizing a stock ColorBurst Profile, we
> recommend a UV Cut device. If the media, such as the Epson Proofing
> Stocks, has no UV response, you can probably relin without a UV Cut
> and everything will be fine.
>
> If you are making a new media Profile from scratch and the paper has
> no UV response, a UV Cut device is not required.
>
> In late Dec. to early Jan., we will be releasing Rev. 4.2 of
> ColorBurst for the MAC. Rev. 4.2 now allows the choice of Chroma or
> LAB based Linearization. All new ColorBurst Profiles, that we make,
> are being made with the LAB Lin method. The Chroma method is still
> available, as a choice and to support existing Profiles.
>
> We added LAB Lin due to a third party Fine Art paper, that when
> Profiled w/ Chroma, showed a magenta cast in the highlights of a gray
> ramp and it was not an issue of a UV response. After adding the LAB
> Lin method, the same media's Profile produced neutral grays.
>
> LAB Lin may minimize the need for relin with a UV Cut device. We
> intend to test this.
>
> Though, please note, existing ColorBurst Profiles can not be changed
> from Chroma to LAB Lin. Using LAB Lin requires a new Profile from
> scratch.
>
>
> Regarding the the software UV correction in Profile Maker (PM) for
> building Profiles without a UV filter. Since our Chroma Lin takes
> place prior to Profiling, the reversing problem, as mentioned above,
> will still exist. In addition, the PM Profile does not correct the UV
> in Colorimetric renderings. Their software only eliminates UV for
> Perceptual rendering.
>
> Regards,
> Larry Spevak
> ColorBurst
>
>
>
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