Matthias Müller wrote:
hi again ;-)
Ok, maybe i didn't expressed my needs correctly.
At the moment i generate PDF files using FOP. This PDF files are colored.
What i need now is a way to tell my FOP Serializer to make the same
output in gray scales, WITHOUT changing the color properties of each
colored block.
Got Me ;-)
So, basically, you want the same as what happens when you print anything
that has colored to a gray-scale printer, right? What you need is two
FOP files, of course, and you XSLT process (I assume you use XSLT for
getting your FOP files, but I can't tell for sure of course) is best
split in two phases (or, if you can use the exslt:node-set extension in
xslt 1.0, or if you use xslt 2.0, you can use temporary trees), where
the first phase is your colored transform and the second phase
calculates the gray scales from this (using, of course, an modified
identity transformation that only changes the attributes with color
information).
Google a bit around and you will find plenty of algorithms for getting
from color to gray scale.
An idea to get the all properties that have color information:
<xsl:template match="@*[starts-with(., 'rgb(') or starts-with(., '#') or
starts-with('cmyk(')]" >
<xsl:attribute name="{name()}">
<xsl:call-template name="color-to-bw">
<xsl:with-param name="color-value" select="." />
</xsl:call-template>
</xsl:attribute>
</xsl:template>
Good luck coding!
-- Abel Braaksma
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