How to set PPI of monitor - DPChallenge Forums

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

04/02/2004 07:34:24 AM · #1

Well i am calibrating my monitor using , Calibration Tutorial . Tutorial mentions that i should set pixel per inch for 78 ( i have 14 inch, Ya there are still few of us still stuck with 14 inch)
Guide me

nicklevy

Canon EOS-350D Rebel XT

04/02/2004 07:52:09 AM · #2

if your definition setting is at 800x600, (where 800 representant the number of pixels you have on the width and 600 the number you have on the height) and let say your monitor screen is 12.5" width, than you divide 800/12.5 and this is your screen PPI. In this exemple, 64PPI

04/02/2004 08:54:42 AM · #3

Well, that's not what i meant.

according to tutorial ppi should be 72-100,

any one

Gordon

RIM BlackBerry Curve

Canon EF 85mm f/1.8 USM

04/02/2004 08:56:27 AM · #4

He gave you the right answer.

Look at your screen resolution, measure the actual width of the screen

divide that number by the pixel width. That'll give you your true PPI, which can be anywhere from about 60 to 120

Canon EF 100mm f/2.8 USM Macro

04/02/2004 09:02:26 AM · #5

i dont know much but why choose 800 to be divided by 12.5 , why not 600, hence a monitor will have two ppi? Just confused

I have 14 inch monitor. screen resolution is 800x600

K-Rob

Canon EOS-20D

04/02/2004 09:06:14 AM · #6

While we are on the subject of monitor calibration, can anyone tell me how to use the grayscale-type bar that you see at the bottom of the voting pages?

kirbic

Canon EOS R5

Canon RF 24-70mm f/2.8 L IS

04/02/2004 09:08:53 AM · #7

Originally posted by General:

i dont know much but why choose 800 to be divided by 12.5 , why not 600, hence a monitor will have two ppi? Just confused

I have 14 inch monitor. screen resolution is 800x600

If a monitor's ppi is not the same in horz and vert directions, then a circle will appear oblong, a square rectangular, etc.

Your ppi should be the same no matter which direction you measure in.

Example:

My screen resolution is 2048x1536
My screen dimensions are 15.8Wx11.75H

Horizontal ppi = 2048/15.8 = 129.6
Vertical ppi = 1536/11.75 = 130.7

So I'm within 0.84% of the same value.

edit for typo...

Message edited by author 2004-04-02 09:09:43.

Gordon

RIM BlackBerry Curve

Canon EF 85mm f/1.8 USM

04/02/2004 09:10:25 AM · #8

Originally posted by General:

i dont know much but why choose 800 to be divided by 12.5 , why not 600, hence a monitor will have two ppi? Just confused

I have 14 inch monitor. screen resolution is 800x600

You could measure the height and divide real height/600 as well

should give roughly the same answer, assuming your pixels are square.

Typically though, if you use the width, you'll have less error, because you'll average your measurement over more pixels.

willem

Sony Alpha a6700

Sony E 18-135mm f/3.5-5.6 OSS

04/02/2004 09:19:25 AM · #9

Originally posted by General:

i dont know much but why choose 800 to be divided by 12.5 , why not 600, hence a monitor will have two ppi? Just confused

I have 14 inch monitor. screen resolution is 800x600

Your confusion is caused by the statement "14 inch monitor", which typically refers to the diagonal size. As explained by others you should take the real horizontal or vertical measurement.

jab119

04/02/2004 09:39:42 AM · #10

Originally posted by K-Rob:

While we are on the subject of monitor calibration, can anyone tell me how to use the grayscale-type bar that you see at the bottom of the voting pages?

you should be able to see the difference between each shade on the chart at the bottom of the voting page, not a drastice difference on the outer edges on the black and the white side, but you should see a difference.

adjust your brightness and contrast on your monitor until you see this slight difference.

James

K-Rob

Canon EOS-20D

Canon EF 100mm f/2.8 USM Macro

04/02/2004 10:05:24 AM · #11

Originally posted by jab119:

That's what I figured. Thanks

scalvert

Canon EOS-5D Mark III

Canon EF 24-105mm f/4.0L IS

04/02/2004 10:14:56 AM · #12

General- the answer to your question does not require any math. The actual viewable area of 14" monitors might vary by as much as an inch from one model to another, so even if both monitors are set to 800x600 pixels, the resolution could be anywhere from 68ppi to 90+ ppi on an LCD screen. Resolution actually has nothing to do with color calibration anyway. The tutorial is only telling you to make the most of your monitor by setting it to an optimal resolution. A lower resolution will make the images on screen appear larger, but you'll have less room for palettes and windows. A higher resolution will show more on the screen, but you may not be able to resolve the details or read small text. Just pick a resolution that's comfortable for you.

Message edited by author 2004-04-02 10:15:32.