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VIP
Posts: 11,535
Registered: ‎12-07-2012

Re: 72 DPI or 300 DPI - Which Is Better For Web And Print Both?

This is a hard concept for most people to realize.  It is made even more confusing when PS and/or LR has them listed usually in a place that compounds the confusion.  Plus folks all over the place (the web!) talk dpi when they really don't mean dpi or don't know what they are talking about.

Photos DO NOT have dpi.  Printers have dpi.

EOS 1DX and 1D Mk IV and several lenses!
Esteemed Contributor
Posts: 3,469
Registered: ‎02-17-2016

Re: 72 DPI or 300 DPI - Which Is Better For Web And Print Both?

No, but scanned images have dpi which is where that comes from.

Honored Contributor
Posts: 5,048
Registered: ‎06-25-2014

Re: 72 DPI or 300 DPI - Which Is Better For Web And Print Both?


@ebiggs1 wrote:

This is a hard concept for most people to realize.  It is made even more confusing when PS and/or LR has them listed usually in a place that compounds the confusion.  Plus folks all over the place (the web!) talk dpi when they really don't mean dpi or don't know what they are talking about.

Photos DO NOT have dpi.  Printers have dpi.


OK, fine. But as long as major competitions continue to express their size constraints in DPI, we'd better at least understand what they're saying.

Bob
Philadelphia, Pennsylvania USA
VIP
Posts: 11,535
Registered: ‎12-07-2012

Re: 72 DPI or 300 DPI - Which Is Better For Web And Print Both?

"...scanned images have dpi which is where that comes from."


Actually they don't. They have PPI. It is just another confusing point in all of this.


"..we'd better at least understand what they're saying."


Wouldn't it be better to do it correctly?  Understand it correctly?
Camera images mostly have no resolution assigned to them.  When you open the file in most image-editing programs, such as Photoshop, a resolution is assigned to the file.  Photoshop, uses 72 ppi as a default resolution. It is incorrect to say that digital camera images have a resolution of 72 ppi since it is the software program assigning that number.


Monitor resolution is measured strictly by pixel width and height.

 

Though the terms DPI and PPI both describe the resolution of an image, they’re not the same thing. PPI describes the number of square pixels that show up in an inch of digital screen. DPI is a printing term referring to the number of physical dots of ink in a printed document.  Photos DO NOT have dpi.  Printers have dpi.

EOS 1DX and 1D Mk IV and several lenses!
Honored Contributor
Posts: 5,048
Registered: ‎06-25-2014

Re: 72 DPI or 300 DPI - Which Is Better For Web And Print Both?


@ebiggs1 wrote:

...

Though the terms DPI and PPI both describe the resolution of an image, they’re not the same thing. PPI describes the number of square pixels that show up in an inch of digital screen. DPI is a printing term referring to the number of physical dots of ink in a printed document.  Photos DO NOT have dpi.  Printers have dpi.


A distinction without a difference. An inch is an inch. What a "dot" or "pixel" physically is, is irrelevant.

Bob
Philadelphia, Pennsylvania USA
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VIP
Posts: 11,535
Registered: ‎12-07-2012

Re: 72 DPI or 300 DPI - Which Is Better For Web And Print Both?

Whatever!  Have it your way.

 

 Exactly why this confusion remains.  It becomes impossible to pull people into the facts when they resist all efforts at learning.

EOS 1DX and 1D Mk IV and several lenses!
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