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real white line

Printed From: CAD Forum
Category: EN
Forum Name: AutoCAD
Forum Description: Discussion about AutoCAD and AutoCAD LT, viewers, DWG and DWF formats, Design Review, AutoCAD 360, add-ons
URL: https://www.cadforum.cz/forum_en/forum_posts.asp?TID=13757
Printed Date: 31.May.2026 at 23:19


Topic: real white line
Posted By: waynelem
Subject: real white line
Date Posted: 26.Sep.2022 at 21:11

Need help.

I have a PDF of an old real “blue print”, remember, blue back ground and white lines.

I am going to import into AutoCad and I need to add some lines in white, and then make a PDF of the “new blue print”.

Question is how do I make a white line?

Thanks

Wayne



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wayne


Replies:
Posted By: Vladimir Michl
Date Posted: 27.Sep.2022 at 08:24
Either use plot styles or assign it a truecolor hue with maxed RGB values.

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Vladimir Michl (moderator)
ARKANCE - https://arkance.world" rel="nofollow - https://arkance.world - Autodesk Platinum Partner

Posted By: Kent Cooper
Date Posted: 28.Sep.2022 at 15:47
Color 255 is essentially white, or if not truly so, probably plenty white enough for the purpose.

Posted By: waynelem
Date Posted: 28.Sep.2022 at 19:07
When you print it comes out black.


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wayne

Posted By: Kent Cooper
Date Posted: 28.Sep.2022 at 20:37
It's not clear which message that is in response to.  If you use color 255 in color-based Plotting, you also need to designate in your Plot Style Table (where you can have any screen color plot in any color you choose) that things of that color should plot in that color.  Might you have it set to plot color 255 as black?

Posted By: philippe JOSEPH
Date Posted: 29.Sep.2022 at 08:29
Hello, if you have a professional version of Adobe you can "save as" a JPG, open it on Paint, select all ( Ctrl+A ), right clic to invert the colors and have a "grey print" with blue lines.
Could it be easier to modify for you ?
Is the PDF drawing too complicated to be redrawn or do you want to save the beauty of the blue print ?
I know that redrawing from paper to real AutoCAD is painfull but you would get a good document.
When I do this job I place each views, dimensions, etc at the same place, with the same scales, etc and by doing this you will verify that your AutoCAD will be the most correct as possible.


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