Mathematical Problem

[Freaki Li Cuatre]

you trying to fix the problem or is it an intellectual exercise?

If the former then Sketchup.

If the latter, have fun.

The former (it's for a public consultation on the proposed development). I looked at the sketchup site - thanks for that info. Not sure if I need the fully paid up version though.

[Pondlife]

Yes, the pic is Jpeg. Does that alter the scale then?

My numpty understanding on this is that RAW contains all the data that was on the sensor, much like on a negative. Once converted to jpeg, this the equivalent of printing it on 6x4 or 7x5 depending on your jpeg settings. The chimney will be bigger on one than the other.

Happy to be told if this is bollox.

[vetran]

The former (it's for a public consultation on the proposed development). I looked at the sketchup site - thanks for that info. Not sure if I need the fully paid up version though.

sorry looks like they have meddled.

The documentation is vague I suspect the Make version does import / export Google, its a powerful feature.

[alluvial]

My numpty understanding on this is that RAW contains all the data that was on the sensor, much like on a negative. Once converted to jpeg, this the equivalent of printing it on 6x4 or 7x5 depending on your jpeg settings. The chimney will be bigger on one than the other.

Happy to be told if this is bollox.

Yep that's what I was thinking. I've never processed RAW but jpg is resized when it is exported from the camera.

One solution for you is if you can identify an object at the distance you need that has a know size. Then calculate the scaling factor that results in the actual image size and then apply it to your chimney image. You don't need a height any distance will do.

[Freaki Li Cuatre]

Yep that's what I was thinking. I've never processed RAW but jpg is resized when it is exported from the camera.

One solution for you is if you can identify an object at the distance you need that has a know size. Then calculate the scaling factor that results in the actual image size and then apply it to your chimney image. You don't need a height any distance will do.

Does the object have to be at the same distance or can I use any object if I know it's height regardless of its distance ?

[alluvial]

Does the object have to be at the same distance or can I use any object if I know it's height regardless of its distance ?

If you use an object at the same distance as the chimney then it should scale the same. Otherwise you'll have to use one of the other formulae to work out the image size when it moves to the correct distance.
Btw, not an expert, just suggesting possible solutions.

[DimPrawn]

This is why you don't ask code monkeys about anything non code monkeyish.

They haven't got a friggin clue outside their tiny realm of angle brackets and semicolons.

[alluvial]

This is why you don't ask code monkeys about anything non code monkeyish.

They haven't got a friggin clue outside their tiny realm of angle brackets and semicolons.

Here, you talking about me?

[greenlake]

How do I work out what size to make the chimney in my montage?

Just remember that your chimney is never quite as big as you think it is....

[EternalOptimist]

take your wonderful camera to the top. drop it off and time the descent.

at 32 feet per second/per second, it wont take long to determine the height