Cleaning Up Blue Prints

Forum|Forum|7 years ago
October 7, 2018
2 replies
3940 views

I have a number of blueprints that I had scanned at Staples using an HP Blueprint scanner. They scanned them to color PDFs. However, I only need grayscale.

At the folds of the plans, the scanning process created buff colored streaks.

In addition the areas that should be white (or blue) backgrounds have are not solid colors (as one would expect from scanning).

I was wondering if someone had a good system for cleaning up such images.

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D Fosse

Community Expert

We need to see an example. Not the whole blueprint necessarily, just a problematic portion.

F

Fred12345999Author

Participant

I actually have a series of different problems, so I will illustrate them with examples from the bunch.

Here is a B&W "blueprint" at low resolution. The scanning process created buff colored bars and added scattered buff color in what should be white areas. This was a very clean print to begin with. The buff coloring here and in the other image is entirely the result of the scanning process and does not appear in the originals.

One of my question is whether adjustment should be made while in RGB mode or whether I should go directly to grayscale.

I have similar B&W images that the scanning process added much more buff to the white areas and much wider buff bars as the folds.

This is an beautiful blueprint. (The white "folds") in the corners are on the original. The scanner did not distort the folds in color but it would be great to be able to get rid of them. I would then want to convert this to B&W which would mean transforming the various shades of blue to white.

This is a blue on white blueprint. As with all the white backgrounds, the scanning process creates buff at the folds and in the white areas. The original has some poor quality at the right with blue smearing. It would be great to get rid of that.