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-   -   Dpi (http://www.railpictures.net/forums/showthread.php?t=12570)

Greg P 07-29-2010 01:01 AM

Dpi
 
I noticed when I was resizing a picture for upload, the DPI was set to 72.

Now I've always seen this, but I had a kind of "I wonder" moment.

Is 72 enough? Should I be pushing it higher? I'm starting with a 15 megapixel RAW image.

Freericks 07-29-2010 01:11 AM

DPI is a measure for printing and scanning. You do not need to worry about it when only working with digital capture and digital posting.

http://www.creativepro.com/article/t...out-resolution

JRMDC 07-29-2010 01:12 AM

For posting on the web, DPI is irrelevant. Only pixel dimensions (1024x683, etc.) matters.

JimThias 07-29-2010 01:49 AM

Quote:

Originally Posted by JRMDC (Post 118525)
For posting on the web, DPI is irrelevant. Only pixel dimensions (1024x683, etc.) matters.

Then how come 72 has always been stated as the "standard" for web images? if it doesn't matter, why was that made to be a standard?

JRMDC 07-29-2010 02:30 AM

Quote:

Originally Posted by JimThias (Post 118529)
Then how come 72 has always been stated as the "standard" for web images? if it doesn't matter, why was that made to be a standard?

Freerick's link suggests ignorance to be the reason.

Freericks 07-29-2010 02:32 AM

Quote:

Originally Posted by JimThias (Post 118529)
Then how come 72 has always been stated as the "standard" for web images? if it doesn't matter, why was that made to be a standard?

Why do people still believe that carrots help your vision?

Why do people still think you can't go swimming for half an hour after you eat?

Why do people marry for love?

JRMDC 07-29-2010 02:44 AM

Quote:

Originally Posted by Freericks (Post 118536)
Why do people still believe that carrots help your vision?

I am fascinated to find out that the story about carrots was invented in Britain to mask their success at shooting down German planes during WWII, due to the use of radar, unknown to the enemy.

http://www.snopes.com/food/ingredient/carrots.asp

norfolksouthern 07-29-2010 07:13 PM

I think that he want do know how to work with DPI and stuff for Railpace magazine something for my opinion :confused:


- David

milwman 07-30-2010 08:54 AM

72 DPI is all what monitors have for resolution, 300 DPI is what you want for printing or Magazines.

WembYard 08-08-2010 07:34 AM

Rightly or wrongly, I never bother with altering the dpi when preparing pictures for the web - though I do change it to 300 dpi on the rare occasions that I send something to be printed.

goremirebob 09-09-2010 07:15 PM

72 dpi is the standard for web images because the majority of monitors cannot display a higher resolution. Say you have an image at 11" x 8" at 300 dpi on your screen. Save it as 1024 x whatever at 72 dpi. Then display it to fill the screen. It should look virtually the same as the original image.
You only need the big (original) version for printing youself or for publication.
Bob

JRMDC 09-09-2010 08:14 PM

Quote:

Originally Posted by goremirebob (Post 121024)
72 dpi is the standard for web images because the majority of monitors cannot display a higher resolution. Say you have an image at 11" x 8" at 300 dpi on your screen. Save it as 1024 x whatever at 72 dpi. Then display it to fill the screen. It should look virtually the same as the original image.
You only need the big (original) version for printing youself or for publication.
Bob

The implied part about big and small is correct. The part about 72 dpi is just plain wrong. I would write a rebuttal, but I do not have to! Instead I simply provide a link (this article is a bit scattershot but I am not going to look for a better written one right now):

http://www.dpiphoto.eu/dpi.htm

The key: "A photo has no dpi, only pixels"

Oh, heck, I looked a bit, here is another http://www.scantips.com/no72dpi.html

Here is another, a quick glance suggests to me it is the clearest of the three http://www.nicholsonprints.com/Articles/dpi.htm

The second one is clearest specifically on the 72 dpi concept

Just say no to 72 dpi. :) Or 300 dpi as Scott and Janet refer to. Pixels count, pixels.


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