HP Designjet Printers - Merge Control with AutoCAD Release 10/11/12 for DOS and 13/14 for Windows
When plotting a drawing with both light and dark colored lines, light colored lines plot on top of dark colored lines where they intersect.
Set up HPCONFIG In AutoCAD and HP Designjet printer Front Panel to prevent light colors from crossing over dark colors at their point of intersection.
Within HPCONFIG, click Pens... button. For the Plot Merge Control: selection, choose Lines Merge.
Click OK and exit HPCONFIG. If it has not previously been done, add this configuration through AutoCAD's CONFIG utility.
Verify that the front panel of the HP Designjet printer is configured for MERGE=OFF. This is the default setting.
note:It is not necessary to configure the HP Designjet A (C1633A) printer model, as it does not have a front panel MERGE setting.
The printer receives objects in the order that they are sent from AutoCAD's plot function. When light colored objects are sent last, they overwrite dark colored objects at their intersection.
ISSUE: Choosing Lines Merge in HPCONFIG does not seem to work.
SOLUTION: See the following:
Verify that HPCONFIG and the HP Designjet printer front panel are set as described above. Try plotting.
Exit AutoCAD and reboot the computer system.
Start AutoCAD again and try plotting.
Using AutoCAD's CONFIG, delete and re-add the printer configuration. This ensures that the printer configuration has been properly added to AutoCAD's PLOT function. Try plotting.
Difference between "Lines Merge" and "Lines Overwrite"
"Lines Overwrite" means that the last line drawn overlaps previous lines at their intersection. "Lines Merge" tells the printer to merge lines with previously plotted elements. "Lines Merge" would be used to prevent like light colors crossing over dark colors.
Filled patterns are not transparent even with merge on
When two filled objects intersect, one pattern completely overwrites the other pattern at the intersection, even with Lines Merge selected in HPCONFIG.
To get a transparent effect, edit the appropriate printer. CFG file using a text editor and change WHITE from a value of 0 to a value of 1. This will change how "white" areas of the drawing are plotted. The default value 0 makes white opaque. A value of 1 makes white transparent. Keep Lines Merge selected in HPCONFIG.
note:For some information on editing a file, read HP_R12.DOC. For an example, read the SAMPLE.DOC file. These files are located in the same directory as other HP driver files.
The merge effect is global
The entire plot will be done with a single setting of this instruction. There is no method for toggling MERGE on and off (or vice-versa) within the same plot file.
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