James Richard Tyrer wrote:
Dieter wrote:
But does postscript support the same types of gradients that SVG
does?=20
SVG lets you make pretty complex gradients, and while the PS version
of=20
the poster does have some kind of gradient, it's not the same as the=20
SVG version. So either there's a bug in the conversion, or PS just=20
doesn't support complex gradients.
I don't know what you mean by "complex gradients". My copy of the red
book
has wandered off, but PS is a full blown programming language, so I
imagine
it can do what you want.
Taking a quick glance at the wikipedia SVG page, looks like someone
decided
to create yet another graphics language, a couple of browsers have
partial
support, Adobe will drop support in less than a year, yadda yadda
yadda...
The final output is supposed to be a large piece of paper, right? What
language(s) does the printer speak? Probably not SVG.
It appears that a ShadingType 2 has built in support for extending
beyond the end points like InkScape does.
What InkScape calls "None" and SVG calls "pad" is not the default for
PS. it requires this to be stated:
/Extend [true true]
It appears (page 266 & 267 PLRM) that a ShadingType 2 dictionary can
include a function definition. If none is defined,
Actually, you always have to define a function -- see below.
then a linear
shading is used, however, you should be able to define a f(t) do do
whatever you want.
So, for the Green G quoting from IS's PS output:
<<
/ShadingType 2
/ColorSpace /DeviceRGB
/Coords [2338.1521 277.10916 2357.165 266.13211]
/Extend [true true]
/Domain [0 1]
/Function <<
/FunctionType 3
/Functions
[
<<
/FunctionType 2
/Domain [0 1]
/C0 [0 0.67843139 0.14509805]
/C1 [1 1 1]
/N 1
>>
]
/Domain [0 1]
/Bounds [ ]
/Encode [ 0 1 ]
>>
>>
PS will not simply repeat or reflect a gradient (it will only "Extend".
The gradient must be defined over the full extent of the shading. So,
in this case, you would need to change:
/Coords [2319.1392 288.08621 2376.1779 255.15506]
which is the simple part -- this does work.
The hard part is to then define a function for the color that will
provide the needed color over this new interval.
Does anyone actually know PostScript, this would be faster. :-D
IAC, the function needs to go from White to Green to White to Green
rather than from Green to White as it is now.
--
JRT
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