Is possible to know proportions from a picture?

Hello everyone :wink:

I probably show how much silly I am with this question, but I will ask anyway.
Is there any way to know the scale of the objects and the distance between then from a picture like this one?


I would be interested in knowing the lenght of the red lines and the radius of the wheels.


Thanks in advance.

If the photo hasn’t been cropped or otherwise manipulated, you could use Match Photo. Proportions are easy enough. If you know a few dimensions, you can draw the thing to the proper size, too.

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I was afraid of that, thank you :wink:

If you know the length of any part of the model you can use the tape measure, click at each end of that part, then type the real length, followed by Enter. You should be asked if you want to resize the model. After it’s resized you can use the tape measure to measure each of the parts.

@colin but some of them are in perspective, I don’t see any way to know how deep they are.

Since the photo in the example is shot at a slight angle to the side of the toy, you can’t get accurate dimensions by sizing the image to a single dimension. Match Photo could allow you to do that. If you’ve got access to the toy, you’d do best to measure it manually and not work from the photo at all.

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If you have done match photo that takes care of perspective. You would then model some of the object without caring about the size of it. After modeling all the parts you can, you click Done in the match photo palette, then you do the tape measure steps I mentioned. If none of the dimensions are none, does it matter what size you pick?

I don’t know the Android app “DIY Wooden Toys”, but maybe it includes dimensions for the models it shows. You could email the developer to ask for the sizes:

Thank you.

A short animation for the suggested photomatch solution…


Awesome @Cotty.

I think it’s time to take a look at photomatch (I mean watching or reading some tutorials), I was making some tries yesterday with no idea how the tool works.

Just one question about how you did and how photomatch works. Is it supossed you need to draw something first before you use photomatch or you set the picture and then start to draw over?

I’m not extremely interested on that model, but I think what I can learn from this example can be useful for other situations that look similar.

You can setup the photo first and then start drawing over it. That’s probably the better way for something like this anyhow.

I would suggest you read the help files on use Match Photo first and then start with a simpler example. Take a photo of some simple shape like a box and use it to get the idea of setting up the Match Photo lines. Use your own photo so you know that it hasn’t been cropped of had any perspective correction done to it.

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Good recommendation, thank you, I will :wink:

A good starting point…

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Yeah, I was watching that video and the second part briefly, I’m starting to understand how it works.
I don’t understand English spoken so I turn on subtitles on those YouTube videos.
This is only a try, as I said, what I was actually interested is in knowing if that was possible.

So thank you all, I will keep watching some tutorials about this topic and making some tests.


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