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How to make the blueprints of the car on photos?
As in "How to make blueprints by using photos?"
Basically take your reference photo and use it as the background or bottom layer in a 2D graphics program (PhotoShop, JASC PaintShop Pro, GIMP, etc). Then make a new layer. Start tracing over it. If the program supports vector graphics that's even better yet because then you can get nice straight lines, circles, and curves. Once you have all the lines traced over, then make a solid white layer underneath the lines. Then you can save that image as your blueprint.
As in "How to take photos for use in making blueprints?"
1. I suppose the key angles helps. (I'll have to check that myself.)
2. Use a lens with as narrow a field of view as possible when taking pictures (this would be a telephoto or Zoom lens.) This will reduce the distortion effects caused by perspective.
Think of a projection/isometric drawing as having all the sight lines parallel (effectively at 0 degrees.) Since it's impossible in real life to effectively get a picture with parallel sight lines (by using a camera), having the lens angle approach zero is the next best thing. This probably means using a tripod (for steadiness) and getting far enough from the subject to frame it in a picture while using maximum zoom.
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