Digital BW, The Print

On 05/02/2008 CDTobie@... wrote:
> 
> Only what the HP engineers told me: Gray mode uses the one gray plus
> black(s), color mode mixes light grays from colors. Thats not what I 
> see on the "one
> gray" Canon PRO9500, but its what I was told about the B9180 and 
> Z2100.

I think they misinformed you.

'While two K's K+lK are used on shiny stock they are also combining 
composite colours to extend the contrast range. The overall look B&W on 
photo media is rich and smooth.'

http://www.neilsnape.com/HP9180_review.htm


HP's usage stats for B&W composite printing (B9180) show the Gray 
cartridge is used most of all.

HP 38 Photo Black Pigment Ink Cartridge	Approximately 1410 4X6 Photos
HP 38 Magenta Pigment Ink Cartridge	Approximately 6900 4X6 Photos (estimated)
HP 38 Cyan Pigment Ink Cartridge	Approximately 5800 4X6 Photos (estimated)
HP 38 Yellow Pigment Ink Cartridge	Approximately 1470 4X6 Photos
HP 38 Light Magenta Pigment Ink Cartridge	Approximately 550 4X6 Photos
HP 38 Light Cyan Pigment Ink Cartridge	Approximately 1480 4X6 Photos
HP 38 Light Gray Pigment Ink Cartridge	Approximately 260 4X6 Photos
Supplemental cartridges
HP 38 Matte Black Pigment Ink Cartridge	Approximately 2900 4X6 Photos 
(estimated)

http://www.hp.com/pageyield/us/en/PSPB9180/photo.html
-- 
Regards

Tony Sleep
http://tonysleep.co.uk