Comments on: Help me help my brain learn how to scale up and down with precision in Adobe Illustrator.
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator/
Comments on Ask MetaFilter post Help me help my brain learn how to scale up and down with precision in Adobe Illustrator.Mon, 01 Oct 2012 07:11:28 -0800Mon, 01 Oct 2012 07:13:38 -0800en-ushttp://blogs.law.harvard.edu/tech/rss60Question: Help me help my brain learn how to scale up and down with precision in Adobe Illustrator.
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator
If I scaled the artwork up by typing 173.95% into the scale dialog box in Adobe Illustrator, what percentage do I scale it down by in order to get it back to its original size. Is there a simple equation that will do this operation? <br /><br /> I am astonished and deeply embarrassed by my inability to figure this out. I have been using a combination of math skills that I haven't used for 20 years and trial and error--which seems like it should work. I can get it close scaling by hand, but I need it to be exact. <br>
<br>
Also, I am going to be performing this operation probably 50+ times, which is why I need to figure out the equation--if there is one.<br>
<br>
This is a shameless request, I know--but can anyone help?post:ask.metafilter.com,2012:site.225697Mon, 01 Oct 2012 07:11:28 -0800OlivesAndTurkishCoffeemathscalefactorresolvedBy: qxntpqbbbqxl
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3265941
Scale by (10000 / 173.95) percent.comment:ask.metafilter.com,2012:site.225697-3265941Mon, 01 Oct 2012 07:13:38 -0800qxntpqbbbqxlBy: devnull
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3265943
Divide by 1.7395, e.g.<br>
<br>
100 * 1.7395 = 173.95<br>
<br>
173.95 / 1.7395 = 100comment:ask.metafilter.com,2012:site.225697-3265943Mon, 01 Oct 2012 07:14:10 -0800devnullBy: twisted mister
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3265944
Scale down by the inverse of the percentage you used to scale up. <br>
1 / 1.7395 = 0.5749 or 57.49%comment:ask.metafilter.com,2012:site.225697-3265944Mon, 01 Oct 2012 07:14:47 -0800twisted misterBy: pipeski
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3265984
All are correct, but maybe this will cast a bit more light:<br>
<br>
When you scale something by 173.95%, you are scaling it (multiplying its current size) by 173.95÷100 (because <em>per cent</em> means 'divided by 100'). That's where the 1.7395 comes from.<br>
<br>
Division is the inverse operation to multiplication, so you can take the new size and <em>divide</em> by the same number (173.95÷100, or 1.7395) to get back where you started.<br>
<br>
It turns out that dividing something by 173.95÷100 is the same a <em>multiplying</em> it by 100÷173.95, which is 0.5749.comment:ask.metafilter.com,2012:site.225697-3265984Mon, 01 Oct 2012 07:45:41 -0800pipeskiBy: pipeski
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3265987
...and 0.5749 is 57.49÷100, so it's 57.49%comment:ask.metafilter.com,2012:site.225697-3265987Mon, 01 Oct 2012 07:46:51 -0800pipeskiBy: BadMiker
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3266022
Same thing, same explanation, different words...<br>
<br>
100% is just 1 (or 1.00)<br>
Yes? <br>
<br>
So 173.99% is the same as 1.7399<br>
<br>
Your_picture * 173.99% = new_picture<br>
is the same as:<br>
Your_picture * 1.7399 = new_picture<br>
<br>
so:<br>
your_picture = new_picture / 1.7399<br>
<br>
but, as dividing is useless to you, this can be written as:<br>
your_picture = new_picture * (1 / 1.7399) <br>
<br>
and since 1/1.7399=0.5749 :<br>
your_picture = new_picture * 0.5749<br>
<br>
aaaand, 0.5749 is the same as 57.49%comment:ask.metafilter.com,2012:site.225697-3266022Mon, 01 Oct 2012 08:27:40 -0800BadMikerBy: bluefly
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3266057
It might help to think of scaling as (original size of object)*(scaling factor) = (desired size of object)<br>
<br>
You can pick whatever you like for the original size of your object; 1 is convenient, but you can pick the actual size of the object if that helps you keep track of things. So your original increase in size followed the following equation:<br>
<br>
(1)*(1.7395) = 1.7395<br>
<br>
And now you want:<br>
<br>
(1.7395)*(X) = 1<br>
<br>
So, X = 1/1.7395.<br>
<br>
It might be useful to think of things this way in case you ever want to scale up/down to a different size than your original size.comment:ask.metafilter.com,2012:site.225697-3266057Mon, 01 Oct 2012 08:51:53 -0800blueflyBy: bookdragoness
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3266386
If you remember it, the concept you're thinking of is the <a href="https://en.wikipedia.org/wiki/Multiplicative_inverse">reciprocal, aka multiplicative inverse</a>.comment:ask.metafilter.com,2012:site.225697-3266386Mon, 01 Oct 2012 13:45:11 -0800bookdragonessBy: OlivesAndTurkishCoffee
http://ask.metafilter.com/225697/Help-me-help-my-brain-learn-how-to-scale-up-and-down-with-precision-in-Adobe-Illustrator#3296490
thanks all! huge help.comment:ask.metafilter.com,2012:site.225697-3296490Tue, 30 Oct 2012 20:49:19 -0800OlivesAndTurkishCoffee