Digital BW, The Print

Tony Sleep wrote:
> On 05/02/2008 CDTobie@... wrote:
>> Unfortunately the way they mix grays in color mode uses CM&Y for the 
>> light
>> grays, not gray ink, plus a minimum of CM&Y as Epson and Canon do... 
>> so the
>> color mode is not acceptable for B&W printing, only the monochrome 
>> mode, meaning
>> only one tint, no crosstints, and no adjustment of tints, without 
>> metamerism
>> issues.
> 
> Do you have a source for that? I don't believe it is the case. Here gray 
> appears to be used in all modes, colour, composite B&W and black+gray 
> only. The printer exhausts the gray cartridge faster than any other.
> 
> HPB9180 helpfile for 'Print in grayscale' says
> 'Composite gray ...cyan, magenta, yellow and neutral inks
>   Gray inks only ... neutral inks only rendering'
> 
> O'reilly review p2 at http://tinyurl.com/397dlm says
> 
> 'If you print B&W using composite, some colored inks are used. The primary 
> reason for this is to control the bronzing effect on coated photo paper. 
> If you were to print gray inks only on glossy stock, for example, the 
> bronzing might be very noticeable.'

Neil Snape's review mentions the use of CMY in the 
highlights of B&W printing on the B9180, more specific with 
  gloss printing than with matte printing. So that's 
different to the Z3100 that has 4 K inks aboard and doesn't 
use hues in greyscale if not intended.

-- 
Met vriendelijke groeten, Ernst


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