I have to clean it up and make it presentable for further engineering work to be done. Sometimes you just don’t have the time to do a total redraw, and this will allow the design to go on without having to do so.Look at the drawing below. So let’s take a look at how we can use AutoCAD Raster Design to clean up a scan and use it as the background for a design. (And be sure to check out my other articles “ No Contest: New AutoCAD 2017 PDF Import Conversion Explained” and “ When PDF Import Isn’t an Option… AutoCAD Raster Design!” for even more helpful background information on PDFs and AutoCAD Raster Design as we tackle this next problem!)For this article, I have a file that I’ve already determined can’t be converted to a DWG. Architecture, Engineering and ConstructionHave you ever had to resort to using a PDF scan as the background for a design? Here, I’ll take you step-by-step through the process to clean up a scan for a design. Architecture, Engineering & Construction Save, Save, SaveAfter each step in the sections below I hit save. Before image correction After image correctionThere are speckles all over the drawing from the scan process: Before image correction After image correctionAnd there are handwritten notes that need to be removed:Keep reading to see how I fix the issues listed above. See the examples I have listed below.The entire drawing is slanted right. For example, lines are skewed, there are markups obstructing the geometry, and there are specs and smudges making look dirty.AutoCAD will ask for an angle (or two points). This point can be anywhere in the drawing.Next, the command will ask you to Specify source angle. Step 1: Clean up — DeskewLocate the Cleanup button on the Edit panel in the Raster Tools Tab.Hit the drop-down menu and click the Deskew button.Once the command is executed, specify a base point. Check out my previous post on Raster Design for details about these tools. Tif image, reference it into a DWG, and bring it up to scale using AutoCAD Raster Design. I always click save here.To get started, I convert the scan to a.
![]() See my previous post on Raster design for more details about fixing image skew. I typed in 90 for my destination angle, and this rotated the whole image and corrected the drawing skew. In my case, I picked a line that should be 90 degrees (straight up) but it wasn’t. AutoCAD will then ask for a destination angle, which is what you want the angle for the line you just picked to be. Then, for the first pick-point, I click an endpoint (on that longest line), and then I pick an endpoint (on the other end of the longest line). Next, you’ll confirm the image you’re selecting. The Despeckle command does exactly what it sounds like: It despeckles! See all of the speckles in the image below? That’s what we’re about to fix.Start by clicking on the Cleanup dropdown menu and select the Despeckle command. The results are subtle when zoomed out, but make a big difference when you zoom in for a closer look.Now that the image is deskewed and rubber sheet stretched into shape, we will use another clean up tool. Below is a picture of my rubber stamp points for this drawing. Go back to my second post to see how the rubber sheet can help you with this. See below for a preview of speckles about to be removed from my drawing. I find it best to pick a speckle then zoom out to preview in red that which is being removed from the image. You also have the option to pick a window over a single speck to define the size of all speckles to remove. Binary subtraction rulesTime to Get the Eraser Out: Touchup Tool ExplainedNow I’ll walk you through the Touchup tool. We’ll get rid of the bigger ones later in the post. If the speckle you select gets to be a too big it will remove more than you wanted. Just be sure to zoom out and see what the preview looks like and that you will not lose any of the image you were planning on keeping. The square brush, circle brush, and rectangle brush buttons determine the shape of the eraser, and the “two points”/paintbrush button changes its size. First, click the touchup button and the touchup toolbar will pop up. Like in most imaging programs, you click on the image in locations where you want to erase something. You can even use this to erase a building out of a drawing if you need to! The ResultsFrom my point of view, what you see below is a much cleaner product than the original.If I have to use a scan as a background for an engineering drawing, I wouldn’t want to do it without AutoCAD Raster Design in my toolbox. In cleaning up this type of drawing, I’ll change the brush type multiple times in order to get large and small clean-up areas. This places the pickbox on my curser and I can start selecting the unwanted objects in the drawing. Next, I click on the “two points”/paintbrush icon in order to create a pickbox size. This way, the changes I’m about to make will happen in black.
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