On Monday 26 February 2007 02:00, Theo Zweers wrote:
> Tim Doty wrote:
> > I only have a b&w laser printer so this hasn't
really been an issue for
> > me, but it has been true for a long time that when
I produce a PDF the
> > colors aren't necessarily right. In particular, as
my output is intended
> > for a b&w printer everything is done in
greyscale but when I produce a
> > PDF if I don't specify greyscale then colors that
are a percentage of
> > black come out as a brown.
> >
> > In double checking that specifying greyscale
produces the correct color
> > (it does) I discovered that it also drops out all
the text.*
>
> I have black or percentages of black (grays) in PDF
(Win version).
And I had only tested in Linux (forgot to say that). So
maybe it is a platform
specific problem then?
> > I printed to postscript file both as color and
greyscale and converted
> > that to PDF via ghostscript. Both the color and
the greyscale versions
> > had brown instead of grey.
> >
> > Tim Doty
> >
> > Note: The first time I tried to print to
postscript PageStream was unable
> > and in fact crashed. Somewhere in there my
preferences file disappeared.
> > I think this is connected in some way with the
failure to produce text in
> > the greyscale PDF produced directly from
PageStream as a second go on
> > that succeeded in producing greyscale *and* text.
>
> If you mean PageStream5.ini (preferences file): this
didn't, ever,
> happen to me. At least: I don't recall this.
I've never had this happen before it was very strange. The
first symptom was
PageStream no longer had any idea where files were and was
unable to save
files or even get a listing of them in a file requester.
> But... sometimes the colors in PDF don't match the
colors in PGS, and I
> don't mean black(ish).
What puzzles me about this is that the text is still black,
just some object
fills that are a percentage of black become a sort of
brown.
> What I noticed in the years is: if you have a color
named, for instance,
> orange and some of the oranges are different from each
other, only one
> orange (maybe the first external (!) illustration with
orange) in is
> shown in PGS.
> In PGS all the other oranges are there: Orange.1,
Orange.2, and so on.
> And the oranges can differ 1/255 from the other (for
instance in R from
> RGB), to change the name in Orange.#.
> And the PDF will receive only the one orange (OK, it is
a PGS fault (not
> sure) , or mine (most likely)).
Recently at least I have not checked the color definitions
of the duplicate
colors (I still get them sometimes for unknown reasons --
and at least one
known reason, external iff ilus files) but this is the first
I'd heard about
them differing. I'll have to check next time before deleting
the dups.
[edit: wow! "Blue" is defined as a CMYK color 100%
cyan and 100% magenta,
"Blue 1" is defined as a Gray color. The swatch in
the main colors window
shows blue, but in the edit window it shows black! Change
the model to CMYK
and it has 100% cyan and 100% magenta, though the swatch
remains black.]
> That brings me to this: can PGS change the 1 - 255
color range for RGB
> into percentages. So 51 becomes 20 % (51 / 255 x 100,
of course this is
> an easy one!).
> In this way it matches InkScape (from which, I hope,
SVG is incorperated
> into PGS), and some others. It looks more natural,
percentages instead
> of a part of 255.
As I do black and white only I haven't messed much with the
colors, but I
thought PgS already did colors in percents? Checking just
now, PgS does use
percents, at least in the color dialog. This is true for RGB
and CMYK models.
Tim Doty
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