• What Plumb-Bob can do?
With Plumb-Bob you are able to transform an usual picture in a plan view.
It is sufficent to know 4 key points of the plan to rectify.

Plumb-Bob is a perspective rectifier useful in many fields: architectural survey, building renovation, furnishing design, estate agents, and it represents a real completion for the metric / photographic survey.

• How it works?
There are few ingredients needed:
A picture not too big (2 MegaPixels are enough), where 4 known key points are clearly visible.
The real coordinates of the 4 key points. These points have to lay on the same plan we want to survey and they have not to be on the same line (not collinear). The more distant the points are and the less will be the margin of error.

• Lens distortion correction tool
Plumb-Bob provides also a tool for correcting lens distortion (an aberration that causes straight lines to curve). The algorithm can use correction parameters, for a large number of lenses, from the Lensfun database (, which is included in the software.

• Results
As result you get a rectified image you can use as template in your CAD application, in order to retrace the drawing.

• More…
Once you have made the rectification, Plumb-Bob knows the parameters needed to know to convert every point on the image in real world coordinates.
You can get real distances directly on the picture.

What’s New

Version 3.0

Rotate image left / right
Undo on rotations and crop
New pin points
New graphic for start image
Ready for MacOS X 10.13
Minor fixings and improvements

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

Give Life Back 2 Music ,

Useful and easy to use

The application seems to do what it claims, and runs fine on Macbook Pro with latest OS. It is fairly intuitive, though it did take me a little while to get used to inputting the real points and figuring out what was the purpose of that. Overall it was a pretty good value.

sidbreameasaht ,

Excellent Customer Service

I had problems figuring out how this works and sent a message to the developer. I never expected a response and thought I had thrown away my money. Much to my surprise, I received a prompt email reply. They followed up with me until I got the results that I wanted on my project! I highly recommend this app and appreciate all of the customer service that it offered.

macforme ,

What a fabulous idea

This app is so handy. I love it. You don’t know how much you needed it this till you use it.


Paolo Marcuccetti
5 MB

OS X 10.8 or later, 64-bit processor


English, Italian

Age Rating
Rated 4+
© Paolo Marcuccetti


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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