Hello All,
After many months of lurking on this mailing list, I am going to submit
myself as a "willing victim" for whoever might wish to bark at my potentially
naive questions. Hopefully get my questions answered at the same time!
I have been developing an itextsharp app that produces high-quality,
atlas-style maps. Similar to another recent poster, but we are using
PostgreSQL/PostGIS as the backend instead of ESRI products.
The application is nearly complete and the features itext have allowed us to
include in our pdf maps are great. The maps are fully layered, have a place
name index with entries linking back to their locations on the map, etc. We
also utilize a raster relief-shading backdrop that is overlayed with colored
elevation polygons. For the relief effect to show thru, it is necessary to set
transparency on the elevation polygon layer. A couple of other layers also
utilize transparency for different reasons.
As previously mentioned on this list, setting any transparency in a pdf doc
will potentially alter the display/printing of the originally defined colors.
This is happening with our maps and we would very much like to figure out how
to stop this. The original color scheme was designed in Illustrator and the
colors as rendered in Acrobat are considerably "duller" than the originals.
I have seen from other postings and the pdf ref manual that this problem can
be solved by setting the blending colorspace or the transparency group
colorspace (maybe they are the same thing?). It does not seem that itext can
set these. Is this true, or have I just missed something?
Other postings seem to indicate that embedding an ICC profile can also solve
this problem. My knowledge of this subject is limited, so I would like to ask
if this is actually the case before trying to chase down how to do it.
I have noticed that ESRI solves this problem by rasterizing all transparent
layers and creating an image which is used as the bottom-most map layer when
exporting maps from ArcMap to pdf. While this does preserve the original
colors, it is a solution we hope to avoid if possible. As mentioned, my
knowledge of colorspaces and the like is imperfect, so any guidance would be
greatly appreciated.
Thanks,
Eliot Cline
GIS Application Development Lead
Go Spatial Ltd.
Hong Kong
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