Hi,
When you use the PDF export function in Condes, there is a setting in the PDF export dialog that lets you choose between Blendmode DARKEN and "overprint operator" for overprint effect. The default setting is the so-called Blendmode DARKEN.
The visual result (on the screen and on the printer) is virtually identical for either of these two options.
However, when opening the PDF file in Adobe Reader (and some other PDF viewer applications), the overprint is not shown - colours become solid - when "overprint operator" is used. Adobe Reader has a setting that enables "Use overprint preview". When this setting is enabled, Adobe Reader shows the overprint correctly.
When the file is created with "blendmode DARKEN", there is no need to enable any settings in Adobe Reader - the overprint effect is readily shown without changing any settings.
My recommendation is to create the PDF file with "blendmode DARKEN".
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A few words about using the PDF export function vs. using a PDF printer driver to create PDF files. The PDF export function ensures correct overprint effect and keeps map colours in the original CMYK colour space, whereas some PDF printer drivers create bitmap graphics and uses RGB colours. Using vector graphics ensures the that the image is scalable without loss of quality.
Also, when using a PDF printer driver, even when the PDF printer driver is capable of creating a PDF file with vector graphics, it may not be able to handle overprint effect. If it is, it will use the "overprint operator", forcing you to change the "overprint preview" setting in Adoble Reader, to see the overprint.
If your original map file is a bitmap file, a PDF printer driver may reduce the resolution of the map, resulting in blurred lines. The PDF export function keeps the bitmap file at the original resolution.
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I hope this clarifies. You are always welcome to contact me in this forum or via e-mail if you have further questions or feedback.
Regards,
Finn
Edited 1 time(s). Last edit at 03/17/2018 11:45AM by finn.