Expanded Gamut

[David Milisock]

Hi David,

Adobe do not own the PDF specifications.

New innovations and implementation go through the ISO TC130 Committee process. Anyone can be on these committees and yep, there are some people from Adobe - but they are well out numbered

I have seen innovations like PDF VT from the first meeting - that was a tough meeting - we reviewed line by line each instruction code before it was put to a vote to create set of legal commands for the PDF VT 'Standard / Specification'.

Jump in - the more people involved the easier it is and the better the results.

Regards,

I may take you up PDF is rapidly becaoming a detriment to work flows.

BTW are you aure that it's the not just the reader specification that's in public domain.

[Bondi_dan]

Hi David,

Just noticed your comment about whether the Reader is what is in public domain - no it is Adobe's property.

Have a look at this - the ISO specification for PDF 1.7.

ISO 32000-1:2008 - Document management -- Portable document format -- Part 1: PDF 1.7

Adobe's Acrobat reader is now really 'just another application' that will read and render a PDF - hopefully correctly.

The field is wide open to anyone to write/promote PDF reading/rendering software.

Regards,

[David Milisock]

Hi David,

Just noticed your comment about whether the Reader is what is in public domain - no it is Adobe's property.

Have a look at this - the ISO specification for PDF 1.7.

ISO 32000-1:2008 - Document management -- Portable document format -- Part 1: PDF 1.7

Adobe's Acrobat reader is now really 'just another application' that will read and render a PDF - hopefully correctly.

The field is wide open to anyone to write/promote PDF reading/rendering software.

Regards,

>Adobe's Acrobat reader is now really 'just another application' that will read and render a PDF - hopefully correctly
Like that's ever going to happen!

[Stephen Marsh]

Ant suggestions on Extended Gamut Ink to use to help get closer to colors containing Pantone Purple.
We tried CMYKOGV and CMYKOGB and CMYKOGV substituting Rhodamine for Magenta. The last option helps but still not close enough to get the custoer to sign off on High Chroma Purples.

Kodak have a colour separation tool named "Spotless", it uses a CMYK+spot system to reproduce many different spot colours using an extended gamut process set.

Spotless 5 = CMYK+Orange

Spotless 6 = CMYK+Orange+Purple

Spotless 7 = CMYK+Orange+Purple+Green

They use purple in the 6 and 7 colour system for a good reason!

SPOTLESS Printing Solution - Kodak Graphic Communications Group


Sincerely,

Stephen Marsh

[gordo]

Kodak have a colour separation tool named "Spotless", it uses a CMYK+spot system to reproduce many different spot colours using an extended gamut process set.
Spotless 5 = CMYK+Orange
Spotless 6 = CMYK+Orange+Purple
Spotless 7 = CMYK+Orange+Purple+Green

They use purple in the 6 and 7 colour system for a good reason!
Sincerely, Stephen Marsh

A point of clarification. The Spotless extended process colors are not predefined. So, Spotless 5 simply means that there is a fifth process color. It can be any color - blue, green, orange, etc.

Same thing for Spotless 6 and 7. Spotless 6 simply means that there is are six process colors and Spotless 7 means there are seven. Those extra colors can be any color- blue, green, orange, etc.

best, gordo

(formerly Creo/Kodak Spotless product developer and marketing manager)

[Stephen Marsh]

Thanks for the clarification Gordo!

My statement was based on the following PDF, which is perhaps a more "formalized" application of "Spotless" in relation to it's specific use in an attempt to cover a wider range of the Pantone gamut, where the extra ink colours are defined - rather than in a "less formal" application where any spot colour could be used to extend the CMYK gamut.

http://graphics.kodak.com/KodakGCG/u...lessPoster.pdf

My basic point was that purple was used for a good reason, rather than another colour in an attempt to come close to purple without using purple.


Best,

Stephen Marsh

[gordo]

Thanks for the clarification Gordo!
My statement was based on the following PDF, which is perhaps a more "formalized" application of "Spotless" in relation to it's specific use in an attempt to cover a wider range of the Pantone gamut, where the extra ink colours are defined - rather than in a "less formal" application where any spot colour could be used to extend the CMYK gamut.

http://graphics.kodak.com/KodakGCG/u...lessPoster.pdf

My basic point was that purple was used for a good reason, rather than another colour in an attempt to come close to purple without using purple.

Best, Stephen Marsh

I see how you could have been mislead.

That poster (the PDF) was intended as a pocket insert in the Spotless product brochure. The choice of an Orange ink for Spotless 5 was completely arbitrary. We could have used a blue or green or red etc. I think this was explained in the brochure.

The choice of the actual hues used in that poster was based on maximizing the gamut to simulate the greatest number of Pantone colors for that particular paper and printshop. If it was a real customer using Spotless in production work then the number of and specific hues would be chosen according to the range of custom spot colors (brand, Pantone, etc.) that the printer was supposed to simulate at their facility on their particular paper stock.

Most printers using Spotless use it as a six color system and some kind of purple, violet, or blue is a popular choice for one of the six color process inks since wet trapping issues tend to limit the range of blues and purples possible using just Cyan and Magenta.

best, gordo

(NB I am not employed by Kodak)