|
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, projected on the fly, have a city 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 Sent with DeskNow Lite - Free mail & groupware server http://www.desknow.com |
------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________ iText-questions mailing list iText-questions@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/itext-questions Buy the iText book: http://itext.ugent.be/itext-in-action/
