Printing a scale drawing from a Photo

[Ofnuts]

(01-03-2022, 03:01 PM)rovingpaddy Wrote: I had a search around but couldn't find any conclusive answers to what I'm trying to do. I'm new to the forum, so any help is very much appreciated. 

So, I need to produce patterns for making bicycle frame bags for my work. However not everyone lives local enough to do a physical drawing/pattern. So customers will email me a high res photo of their bike frame with a tape measure or ruler attached to the frame for scale.
My question is, how can I take this image from the customer and then using GIMP, make sure the image is at 1:1 scale and then print it out on multiple A4 pages? Is there even a way?

I'm very new to using GIMP so I'm completely lost at the moment.

If you can point me in the direction of any other topics or videos that may help that would also be great.

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Cheers
Patrick

You would need two rulers on the picture, one horizontal and one vertical. It is obvious that you sample picture was taken from eye level, so vertical dimensions are distorted by perspective and appear smaller. For instance in your picture the rear wheel is 1494px wide but only 1455px high. You can sort of fix this because you know the wheel is a circle, but there are other distortions due to the wide angle lens of the phone (so parts in the middle are slightly enlarged).

You would need to ask your customers to take the picture from far away (4 to 5 bike lengths), while kneeling down if you want usable photos.