Printing problem with transparent fills

by Judit Boros and GRAPHISOFT · updated: 05.08.2017 · RefID: 64505

Issue

Fills are not printed correctly via the File-Print menu or from printing via the Publisher Dialogue box. Some part of the fills are missing, see examples:

vegleges001.jpg
vegleges003.jpg

Cause

When transparent solid fills (also known as “percentage fills”) overlay other fills, the transparency might appear correctly on screen and in PDF, while it looks bad in printing. The reason is the data conversion that occurs while the data is passed to the printer.

On Mac: When printing from a Mac OSX application, a PDF file is used as an interim “spool” data format between the application and the printer driver. The printer driver converts this PDF file into PostScript data for PostScript printer types. PostScript has limited support for transparency, which is why the end result is sometimes bad while the PDF output from ARCHICAD still looks good.

On Windows: ARCHICAD sends information to the printer driver in GDI plus format. This data is then converted by the printed driver to the printer’s own language. (Some common printer languages include PostScript, PCL5, GDI). Some of these languages have limited support for transparency, therefore some of the visual information is lost in translation.

Solution

  • As a workaround save the output as PDF file. Print this PDF with Adobe Reader. Adobe Reader re-processes the content of the PDF file and has sophisticated algorithms to circumvent many of the PostScript limitations. Adobe Reader is free on both Mac and PC.
  • Use a non-PostScript printer driver.
  • Avoid overlaying pattern fills with semi-transparent (percentage) fills.

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