On Thu, 1 Mar 2001 Peter Reid <[EMAIL PROTECTED]> wrote:
> >I have seen this and have had hundreds reports from clients that have seen
> >this with apps I have made with MC. It happens only on the Mac. It affects
> >many different printer manufacturers too. I am not sure what the cause is,
> >but if you can live without color printing, you can get rid of it with by:
> >set printcolors to false.
> >
> >What is weird is that the problem shows up randomly. Your prints may print
> >fine on one print out then the next you get the grey background. If you or
> >anyone finds a better solution than setting the printcolors property, I
> >would like to know too. Sometimes clients need to be able to print in
> >color.
>
> Thanks for the tip, I can confirm that turning off colour printing
> "fixes" the problem. However, this leaves the problem that when run
> on a PC, my stack can print in colour, but when run on a Mac it
> can't!!!
>
> Any suggestions/thoughts from Kevin/Scott on this?
The only case I know of that causes this is if you try to print a
transparent image on a system set to 16 bit color depth. In this
case, it needs to take a snapshot of the screen (because most
printers, including all PostScript printers, don't support
transparency), and since you only have 5 significant bits to deal
with, you can't get a true white: Instead of an RGB value of
255,255,255, you end up with 241,241,241 which looks like a light gray
or a very sparse dither pattern, depending on the printer. There are
no workarounds for this other than not using 16 bit display depth or
not using transparent images.
Regards,
Scott
> Cheers
> Peter
> --
> --------------------------------------------------------
> Peter Reid
> Reid-IT Limited, Loughborough, Leics., UK
> Tel: +44 (0)1509 268843 Fax: +44 (0)870 052 7576
> E-mail: [EMAIL PROTECTED]
> Web: http://www.reidit.co.uk
********************************************************
Scott Raney [EMAIL PROTECTED] http://www.metacard.com
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