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DPChallenge Forums >> Challenge Suggestions >> Golden triangles
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Showing posts 1 - 8 of 8, descending (reverse)
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05/06/2015 01:12:42 PM · #1
Sort of- they are based off of the phi number... Can't remember exact digits but 1.6 something.

The pentagram triangle is often used in drawing.
05/06/2015 12:48:03 PM · #2
The mathematic one is what makes the photographic one??? They are one in the same applied to photography???
05/06/2015 07:43:23 AM · #3
I was referring to the composition rule for photography, not the mathematic one.

It's like rule of thirds, but for images with a diagonal element. You frame up your subject either along one of the diagonals, or in one of the triangles.

Further, you can use it as a quick visual aid to figure out where the phi grid sweet spots are (or "golden rectangles").

I was thinking of the triangle for framing, though, as a challenge.

It is a composition technique I rarely use, just because rule of thirds is easier for me to visualize. But I want to improve at it. Thought perhaps, others would find it challenging as well.
05/06/2015 05:32:30 AM · #4
Originally posted by GeneralE:

Thanks! Is the sweet spot where the unencumbered dots are, the vertices, or somewhere else?

Typically, the composition will flow diagonally from corner-to-corner and there will be a second diagonal intersecting that at right angles, OR there will be a dominant diagonal with the subject protruding above/below that diagonal from one of the two intersection points. It's a pretty loose compositional guide, really; sometimes the diagonals are just implied.

Confusingly, there's an actual "golden triangle" which is an isosceles triangle whose base is half the length of its sides:

' . substr('//upload.wikimedia.org/wikipedia/commons/thumb/0/01/Golden_triangle.svg/192px-Golden_triangle.svg.png', strrpos('//upload.wikimedia.org/wikipedia/commons/thumb/0/01/Golden_triangle.svg/192px-Golden_triangle.svg.png', '/') + 1) . '

Note that this triangle is the implied isosceles triangle that repeats inside a pentagram, and gives us the geometry of DaVinci's famed "Vitruvian Man":

' . substr('//upload.wikimedia.org/wikipedia/commons/d/dc/Pentagram_and_human_body_(Agrippa).jpg', strrpos('//upload.wikimedia.org/wikipedia/commons/d/dc/Pentagram_and_human_body_(Agrippa).jpg', '/') + 1) . '

I'm not even sure which one the OP is suggesting we use...
05/05/2015 11:33:20 PM · #5
Thanks! Is the sweet spot where the unencumbered dots are, the vertices, or somewhere else?

Message edited by author 2015-05-05 23:33:55.
05/05/2015 10:55:44 PM · #6
Originally posted by GeneralE:

I know the "golden rectangle" version -- what "rule" is this one?

It's a diagonally-oriented composition built around golden section proportions:

' . substr('//www.picture-thoughts.com/photography/images/pt-golden-triangle02.jpg', strrpos('//www.picture-thoughts.com/photography/images/pt-golden-triangle02.jpg', '/') + 1) . '
05/05/2015 10:50:46 PM · #7
I know the "golden rectangle" version -- what "rule" is this one?
05/05/2015 10:37:33 PM · #8
Take a photo that uses this "golden rule" of composition.
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