FAQ: Notes for publishers – use of opacity in text and image watermarks

1)  In order for printers to print transparent watermark text they must support Alpha Blending.  Most printers support this but some do not. For this reason we recommend that you DO NOT use transparency in text watermarks unless you are using Safeguard in a controlled internal environment where you are sure that all printers support Alpha Blending.  The simplest solution is to use a different colored font (say a grey color) for the watermark text to ensure that it is always printed.

2)  Use of transparency will increase the print memory size required by a factor of ten or more and should therefore be avoided. Publishers should experiment using different colors for text font, whilst leaving the text and image opacity at 255. If the original PDF document contains transparent images (overlaid graphic images that are using transparency on the top) they should be converted into single bitmaps.

3)  If opacity is selected, then the more watermark text you use the slower the page rendering will be in the Safeguard Viewer, and the slower printing will be.  For this reason it is recommended that you use as a maximum one line of text.  Reduce the font size if necessary to minimize the amount of text used.

4) If a background text color is selected it is only displayed at full opacity and not otherwise.