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lis_wang
269 Vistas, 2 Respuestas

Plot AutoCAD drawing layout to PDF lost precision

I have created web application (www.amcad.ai) to auto assess my students' AutoCAD drawing assignments. I preloaded my solution AutoCAD drawing in PDF created from plotting the layout. The "plot style table (pen assignments)" was set as "None" to create color PDF file. As my algorithms only mark the drawing lines with black color. The line color in "Model" space is set as "white" as the drawing background is "black". So the RGB code is 255, 255, 255 color in the layer setting. When I plot the drawing in PDF from layout ("white" background), the white line becomes "black" color.   

 

The marking scores in my algorithms is based on the overlay pixels of both solution drawing and students' drawing. However I noticed that when I moved the views in either solution drawing or students' drawing in the layout, the score can be different. 

 

So my question is if plot to PDF loses the drawing precision? The printer/plotter was selected "AutoCAD PDF (high quality print).pc3".