[OS X TeX] White vs. Transparent?

[William Adams]

On Mar 28, 2006, at 10:45 PM, V. Yu. Shavrukov wrote:

> On Mar 28, 2006, at 14:14, William Adams wrote:
>
>>> I meant sRGB vs AdobeRGB vs ProPhotoRGB etc.  rather than  cmyk vs
>>> rgb vs hsv...
>>
>> Oh. Well presumably you'll only be needing one such tag for the
>> vector and text elements which TeX will create --- just post-process
>> the file to assign such a colourspace tag --- this could be set up
>> using OS X's pdf Services.
>
> Thanks.  Are you saying one can assign a profile to the whole pdf  
> that will apply to all elements that don't already have a profile  
> (spot colour tag etc.) of their own?

Yes.

>>> I'd be curious to learn of a situtation
>>> where you needed more than one and this wouldn't be an option  
>>> though.
>
> Using something like pgf one can continuously vary the colour of an  
> element (which could be a glyph, a paragraph etc.).  This would  
> require more than one spot colour but as far as I can see a single  
> profile would be sufficient.

You don't need more than one spot colour to do this, if the colour  
change is a tint.

If you do need multiple spot colours you need to consult with your  
printer over this and screen angles &c.

Even so, you're not likely to have more than 2 or 3 spot colours in a  
given job, so it should be manageable (the largest number of spot  
colours in a job I'm aware of is Edward Tufte's _The Visual Display  
of Quantitative Information_ which has 23 (over the entire book --- I  
think there're fewer than 4 spot colours per signature).

Or do you mean something other than a specific printer ink colour  
when you say spot colour?

>>> William Adams:
>>>
>>>> Or one can adapt my technique from TUG2003 to access spot  
>>>> colour .eps
>>>> files in a virtual font.
>
> Do I look for that technique in TUGBoat 2003?

Yes, it's in the issue after the Proceedings issue.

http://www.tug.org/TUGboat/Articles/tb24-2/tb77adams.pdf

William

-- 
William Adams
senior graphic designer
Fry Communications



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