/g/, I have a newbie question which I can't find a clear answer online so I'll place it here in hope someone will kindly explain it to me.
What is PPI?
From my understanding (and from what I always thought it meant), PPI means Pixel per Inch. So if we, for example, have a 5,5 inch phone with a 1920x1080 resolution we can calculate how many pixels are in a screen by doing 1920x1080 which will equal 2 073 600 pixels. So we have 2 073 600 pixels in a screen and if we divide this by 5,5 inches we will get 377 018. And this will mean that in each inch we will have 377 018, right? Wrong. From what I looked up you calculate PPI by doing the following:
sqrt(19202x10802) = x
x/5,5
How come? This is only calculating how many pixels there are in a diagonal line and not how many there are in the total screen.
Oh Lord I'm bumping this because it hurts.
>>53841440
It is pixels per inch, not pixels per square inch.
>>53841440
Tl:dr op can't find /sqt/
>>53841637
Whats the point of calculating per inch when you can just calculate per square inch?
Because if we calculate per square inch we get to know the pixel density in one inch
>>53841702
Because 400 or 500 is a lot easier to remember/market/compare than 377,018.
>>53841725
You could just say its 377k PPI
And like I said, by doing this you get to know the Pixel density in one inch.
Also, is there a difference between PPI and DPI? I get mixed answers online too
>>53841770
>just sa it is 377k
So a 377,999 phone is the same as a 377,100 phone?
Besides, phones aren't square or all even the same aspet ratio.. Easier to work with straight inches.
>>53841802
thanks for explanation, anon
>>53841440
>>53841702
>>53841770
Not all phones are the same ratios in resolution. Not only that but a 5.5 inch screen is not a 5.5x5.5.
Take my note 4 for example. It has a resolution of 1440x2560 vertical display. That is exactly 3,686,400. It has a PPI of 518.
Let's use your method.
3,686,400 / 5.7 = 646,736.8 "PPI"
Let's actually square the PPI now.
518*518 = 268,324
As you can see, dividing pixels by a diagonal measurement does not work. You get drastically different results. Thus, on row or column of pixels 1 inch long will work much better as an "exact" measurement for pixels per inch.
