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February 2, 2013
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Canvas sizes - inches and dpi and pixels

Journal Entry: Sat Feb 2, 2013, 7:29 PM


This is a sort of guide on canvas sizes, inches, dpi and pixel x pixels.



when it came to canvas sizes, I always kind of assumed that inches belonged with dpi and pixels were just pixels and that everyone knew that; but i read a whole bunch of comments on a tumblr blog where someone asked about canvas sizes, and SO MANY people were replying with things such as, "4000x4000 px at 300 dpi" or "2000x2000 px at 200dpi".

and I guess not everyone quite understands what dpi's really used for xD.

DPI = Dots per Inch. It means how many dots will be printed per inch.

DPI is actually used for printing purposes. It shows the printer how much pixels to print per inch, literally. A common printer (at home or even at a lot of printing stores) at best prints at 150dpi most of the time actually; there are some super duper great printers that can print REALLY fine that can go up to ...apparently a lot more xD; #dpi, so that's why everyone usually suggests saving your project at 300dpi; most printers are fine with 300dpi, because anything above that is a little overkilling it. There are some super-fine printers though that can print up to maybe 600dpi, but those are not really that common. alright, so apparently it's pretty common =P~ but I've never found myself needing to go above 300dpi; stuff in 150dpi works well for me too, actually >_>;;~ Unless, of course, you're doing extremely high-quality fine-art prints that can sell up to $30-$60 a piece, because really high-quality prints (that requires 600+dpi) costs a lot to print in the first place, so I won't suggest this for anime/comic conventions ^^;~

so say I have a canvas at 5400 x 3600px, it literally means that I have a canvas that can be printed on a 18 x 12 inch paper at 300 dpi. If I have a 5400 x 3600px canvas at 200dpi, that pixels of the canvas don't change, but the inches on the physical paper can change to 27x18 inches when it comes to printing it. The canvas pixels aren't going to change just because you have it at 200dpi, so putting 200dpi, 300dpi or even 800dpi, it isn't going to make a difference digital canvas-wise. If you say something like "5400 x 3600px at 300 dpi", it's the same as saying "5400 x 3600px at 18 x 12 inches.". See how they don't mix? :)

Either put down how big it is in pixels (because you don't REALLY need the 300dpi if you're not printing it out), or if you have an intention of printing it out, do it in inches (or cm, if that's what you're used to) with a dpi attached.

Even photoshop makes it clear - The pixels are in the "Pixel-dimention" section, and the inches/cm/mm/etc and dpi is under the "Document-size" section.

TL;DR: Canvas inches and dpis are for physical prints only; Pixels are digital, so they don't mix with dpis or inches, etc. Digital and physical don't mix in a way that would make sense. Please don't say "2000 x 2000px at 300dpi"~ @_@;

I hope I made sense and cleared up some misconceptions about dpi and canvas sizes :). .and i hope i didn't make a mistake here hahaha;;;.

sorry if i sounded like a know-it-all v_v;; i guess I found a new pet-peeve D;~

damn, i wrote a lot; sorry, bad habit D:~!

edit: if you're a math-kindda person, you can also look at this mathamatically:

12 x 18inch at 300dpi =

12 x 300 dpi = 3600pixels
18 x 300 = 5400

therefore 12 x 18inch at 300dpi = 3600 x 5400pixels

and that's how you get the pixels vs inches + dpi.

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Add a Comment:
 
:iconsingularitycomplex:
My printer only prints at 600 dpi, it's a newer HP Photosmart, so I'm getting overkill regardless. Why would I print an image at 3600x5400 and have every 1 "dot" end up being printed as 4? Well the answer is quite simple really: because my computer sucks monkey balls and wouldn't be able to handle 7200x10800 pixel images, lmao. 
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:iconsingularitycomplex:
God damn dA needs a way of deleting comments. 
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:iconyuukihikari:
YuukiHikari Aug 21, 2013  Student Filmographer
I had a general idea beforehand, but never really had a firm understanding.  That math though... that makes it make perfect sense.  Thanks so much!
Reply
:icongaarapandachan:
gaarapandachan Jul 31, 2013  Student Artist
I've been looking for something like this! what are good dementions for a webcomic? usually i scan stuff in, but i want to start drawing digitally - but whenever i do the pictures end up pixelated when i zoom in a bit, and i can't seem to do any proper detail. (using paint tool SAI btw) i thought it was something to do with a low DPI setting but apparently not...?
Reply
:iconorcha3000:
Orcha3000 Jun 9, 2013  Student Digital Artist
ok so if you wanted to make a pixel icon how big would the canvas be?
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:iconbunnywafer:
Thanks this was really helpful.
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:iconsockstealingnome:
So if you want to print something out at say poster size, it isn't necessary to paint it around the same canvas size?
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:iconqinni:
Qinni May 14, 2013  Professional Digital Artist
I'm not sure what you mean here, but it's necessary to paint however big you want to print it as, at at least 300dpi.
Reply
:iconsockstealingnome:
Ok that's what I thought. After a certain size my program crashes though. I guess I need a better computer.
Reply
:iconbleedingprose:
BleedingProse May 13, 2013  Hobbyist Digital Artist
Brilliant. About time someone made this clear.
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