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-   -   Ratios and Proportions (https://forums.steves-digicams.com/general-discussion-11/ratios-proportions-168244/)

Ordo Mar 28, 2010 2:58 PM

Ratios and Proportions
 
Iím studying ratios and proportions. Of course there's a world beyond the rule of thirds. Interesting subject for photographers. A complex one if you include masses, colors, perspective, points of fugue, etc.
Is there a software that can give me automatic ratios and proportions?
Thanks.

Ordo Mar 30, 2010 1:34 PM

I guess i need to make clear this question.

http://i40.tinypic.com/mtw13p.jpg

I have this pick. I trace the Diagonal and need the software to instantly give me the sideís ratio. Easy. Or i click three points: 1, 2, 3, and the software gives me the ratio 3-2 to 2-1. Címon... am i talking nonsense?

VTphotog Mar 30, 2010 9:16 PM

I am not aware of anything that will do what you are looking for. My photo editor will give me dimensions between selected points, but I would then have to open a calculator to do ratios.

brian

TCav Mar 30, 2010 9:32 PM

It seems to me that what you're looking for is a program that will calculate the least common denominator. That's tough.

Ordo Mar 31, 2010 7:17 AM

Curiuos. It's a very simple subroutine...
It's just dividing two measures (not the least common denominator TCav).

TCav Mar 31, 2010 9:58 AM

Quote:

Originally Posted by Ordo (Post 1072991)
Curiuos. It's a very simple subroutine...
It's just dividing two measures (not the least common denominator TCav).

Dividing one number by another would give you a result like:

1.33333333333333333333333333333333333

That's different from 4:3, which is the ratio.

And the subroutine would need to be smart enought to know where the dividing line is between one ratio and another. For instance, where, between 1.333333... and 1.5, does it stop calling it 4:3 and start calling it 3:2? ... and where does it stop calling the result 16:9 and start calling it 16:10?

That's complicated.

Ordo Mar 31, 2010 10:11 AM

Well, you can always round cut to the second or third decimal. So, 4:3 would be 1.333 which is enough an approximation for practical uses.
Another interesting feature would be selecting a proportion -let's say φ phi the golden number (1,618)- and that the software gives you the instant frame and the chance to move the frame and resize it over your pick and click your actual selection.
Of course we relay on our delicate and precise eyes (?) but a little help on this could be fine.

TCav Mar 31, 2010 11:45 AM

Quote:

Originally Posted by Ordo (Post 1073064)
Well, you can always round cut to the second or third decimal. So, 4:3 would be 1.333 which is enough an approximation for practical uses. ...

Ok, but when does the proportion stop being 4:3 and start being 3:2?

1.4? 1.41? 1.42?.

And how do you tell the subroutine that?

And how do you tell it not to use 7:5?

Ordo Mar 31, 2010 12:26 PM

Easy: i will round cut to two decimals.
That will do it for photography aims.

1:2 = 0.5
1:3 = 0.33
1:4 = 0.25
4:3 = 1.33
3:2 = 1.50
7:5 = 1.40
phi = 1.62
e = 2.72
pi = 3,14
http://upload.wikimedia.org/math/e/f...9d5b08baaf.png = 1.41

And so on.
I posted this same question on Adobe forums. Let's see.

VTphotog Mar 31, 2010 8:15 PM

Check this out: http://forums.steves-digicams.com/pl...s-spirals.html

It has some of what you are looking for.

brian


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