The current OCAD 12 Service Update contains a very interesting new feature for map printing.
The blend mode controls how the underlying color of an object interacts with the blend color of the overlaying object.
The new blend mode settings affect only the map export to a pdf file. OCAD supports the blend modes Darken und Multiply.
In Color dialog click the Blend mode button.
Set the Darken mode for the color Purple, Green over brown and Brown.
The effect in not visible in OCAD!
But it is visible when opening the exported pdf file in Adobe Acrobat Reader.
- Purple control circle is transparent, underlying objects with color blue, green and brown are visible
- Green tree is transparent, underlying contour line is visible
- Brown contour lines are transparent, underying green area is visible
More about the Blend Mode in our Wiki.