>> In Cad "white" prints black
It's depending on what background color you have set for your AutoCAD. Color 7 (what you are speaking about, I guess) is always the opposite of the intensity of the background. So if you are running black as background color 7 will be displayed as white, when running white background color 7 is black displayed. And as the plotter prints on white paper color 7 is black printed (as long as you don't set any CTB or STB converting it).
>> Is there a way to have white as a true color
Why not, why not giving the layer you draw on a true-color value?
- alfred -
upload a drawing or tell us what color-index or setting you used for "white" and "black", also let us know the background color you have currently active in modelspace.
You can also open my drawing and see what's happening with colors when drawn one above the other (sorted by drawoder). In that case all layers have true-color values assigned.
>> CAD will plot both in black
No, that is not true, why do you think so?
You might have set in your plotter settings that colors should be merged (and so you see always the black one), if that is your problem then change that setting.
- alfred -
"So your printer has a white ink/toner cartridge? Ha! Of course not, so like the other programs you must actually set AutoCAD to print "nothing": this is done with setting the plot style table pen to do just that. If you are CTB based, color 355 is almost there. If you use STB you will need to do a little more of a setup."
Sorry I didn't clarify that Yes we do use a CTB and color 255 plots white or "nothing" (with a slight rgb tweak) we call it white as we usually print on white paper. (when you find a 355, please let me know then I will have 100 additional colors to choose from!).
OP didn't specify ctb or stb.
And yes you are correct that our printer doesn't have a white cartridge installed.
It is possible to plot nothing without using color 255, which is "almost" white. Use a wipeout, or pick a color to be your "nothing" color, then in the CTB file set the screening of that color to zero. If you draw an object or hatch an area using that color, and order it on top, then it will plot as a white object on top of everything.
Why not use a Wipeout with a polyline? That way no hatch is required nor draw order. You will see any hatch which is outside the wipeout. Seems like the answer to me. ;-)
Yes wipeout would be easiest for polygon areas, but if you want a white line or polyline a wipeout cannot do that. In those cases using an object with CTB screening = 0 will do it. You can also adjust the width of the polyline to make the white line to the width you need.
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