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DPChallenge Forums >> Tips, Tricks, and Q&A >> Making a picture to scale
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Canon EOS-90D
Sigma 18-250mm f/3.5-6.3 DC OS HSM
 05/27/2009 12:16:45 PM · #1
I'm going to be taking photo's of fire trucks and ambulances for my department and I want to make the printed product to represent the same scale from image to image.

Say... 0.25 inch of photo equals a foot in real life (or something like that). How would I go about doing that in Photoshop CS3? I guess something to do with the measuring tool, but that's all I can guess.

Thanks in advance for any help
Canon PowerShot S3 IS
Canon 12x IS USM (S3 IS built-in Lens) -- 36-432mm (35mm EQ)
 05/27/2009 12:42:28 PM · #2
You can either measure something in each image, or include a ruler or object of known size in the shot (or a second shot of the same object). You might try researching forensic or evidentiary photography, as that's where this technique would most likely be needed.
Canon EOS-5D
Canon EF 100-400mm f/4.5-5.6 L IS
 05/27/2009 01:16:14 PM · #3
I would put a yardstick, or some large object on the ground below the vehicle in each shot. Then in PP I would layer each vehicle over one 'benchmark' vehicle, lower the opacity of the layer, and Free Transform to make the measuring object identical.

QED
Canon EOS-90D
Sigma 18-250mm f/3.5-6.3 DC OS HSM
 05/27/2009 06:04:30 PM · #4
Slippy....that's a great idea!!!

General...I actually found a book on just that, but I'm not sure my wife will let me spend the $80 right now (she's quitting her job and doesn't have another one lined up yet).
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