Reducing DPI How is it done????? Hello One and All: I am trying to understand DPI and how to reduce it to 72 DPI? I would appreciate any assistance anyone can give. I am from the film...

robertcull Loc: San Francisco, CA

Hello One and All: I am trying to understand DPI and how to reduce it to 72 DPI? I would appreciate any assistance anyone can give. I am from the film era and am new to digital and computers.
Always learning...it's a trip. Thanks in advance for your assistance.

Doc :thumbup:

snowbear

DPI is actually a misnomer - it means dots per inch and is a holdover from dot-matrix printers. It is nothing more than how many pixels (dots) are in an inch.

I use Adobe Lightroom for most of my processing. Since I shoot raw, I have to convert the images to jpeg for publication. I just tell Lightroom what to make the dpi when I convert.

GoofyNewfie Loc: Kansas City

What editing program do you use?
There is usually an Image Size choice available somewhere in the program.
Also- the image resolution is measured in Pixels Per Inch (PPI)
Printer resolution is usually measured in Dots Per Inch (DPI)
http://www.andrewdaceyphotography.com/articles/dpi/

travlnman46 Loc: Yakima WA

robertcull wrote:

Hello One and All: I am trying to understand DPI and how to reduce it to 72 DPI? I would appreciate any assistance anyone can give. I am from the film era and am new to digital and computers.
Always learning...it's a trip. Thanks in advance for your assistance.

Doc :thumbup:

Hi robertcu: A good number of post processing programs have the ability to reduce the DPI. They can usually be found in one of the drop down menus.

GoofyNewfie Loc: Kansas City

PPI?

Photoshop CS5 doesn't do DPI.
Only PPI.

robertcull Loc: San Francisco, CA

Thank you. I was asked by a photography instructor to send some photos no more than 72 dpi. I was perplexed because I am used to PPI and did not understand dpi. Thank you again.

CaptainC Loc: Colorado, south of Denver

robertcull wrote:

Thank you. I was asked by a photography instructor to send some photos no more than 72 dpi. I was perplexed because I am used to PPI and did not understand dpi. Thank you again.

That instructor is wrong.
Why do you want 72PPI. If it is for web or email, the 72PPI thing is a myth. ALL that matters is the pixel dimension...like 640x800. The PPI number is meaningless. ON the screen 640x800 will be EXACTLY the same size at72PPI, 245PPI, 679PPI....whatever.
If it is so it cannot be printed, that too is baloney. To print, the person has to make it a PPI that prints well and that 640x800 at 240PPi will only be a bit over 3 inches on the long side.
This 72PPI thing has a life of its own based on horrible information - sorta like Johnson had Kennedy killed. OK...maybe a bad example.

robertcull Loc: San Francisco, CA

Thank you for your information. It's a confusing world sometimes, people can fool us into believing that things like dpi/ppi are important and mean something.
Thank you for clearing up this issue. :thumbup:

singleviking Loc: Lake Sebu Eco Park, Philippines

Who ever this instructor is, he has a stone mason chipping 72 dpi into his stone tablets. Tell him to buy his mason smaller chissels or actually buy a descent printer. LOL. Just curious, is this instructor into color yet? They can't chissel color into stone tablets. Did this guy do the 10 commandments too?
Actually he's probably looking at thumbnail photos. He needs to change the resolution of his monitor to something from this century.
I would try to find an instructor that doesn't go by the name Moses. LOL.

nikonshooter Loc: Spartanburg, South Carolina

CaptainC wrote:

quote=robertcull Thank you. I was asked by a phot... (show quote)

http://www.bestprintingonline.com/resolution.htm

http://www.vsellis.com/multimedia/understanding-dpi-resolution-and-print-vs-web-images/

oldtool2 Loc: South Jersey

I suspect he did this to keep file size down. He would have been better off limiting the file size to say 500 or to tell the class nothing bigger than say 640x800.

Old habbits die hard sometimes. This is the second or third thread I have seen asking this question for various reasons.

Jim D

nikonshooter Loc: Spartanburg, South Carolina

oldtool2 wrote:

I suspect he did this to keep file size down. He would have been better off limiting the file size to say 500 or to tell the class nothing bigger than say 640x800.

Old habbits die hard sometimes. This is the second or third thread I have seen asking this question for various reasons.

Jim D

If I had to bet, I would bet this question will be asked again.

I agree, keeping file sizes under 500 kb can help avoid getting your site shut down even if you have unlimited storage in these shared hosting plans. Been there done that!

dpullum Loc: Tampa Florida

If you need it is one question, If you want it is another... you asked for it is what your request was SO:

Download Freeware... FASTSTONE RESIZE... under advanced choices is dpi and you put in 72 vertical and horizontal and zaaap you have it. simple as that

Mudshark Loc: Illinois

snowbear wrote:

DPI is actually a misnomer - it means dots per inch and is a holdover from dot-matrix printers. It is nothing more than how many pixels (dots) are in an inch.

I use Adobe Lightroom for most of my processing. Since I shoot raw, I have to convert the images to jpeg for publication. I just tell Lightroom what to make the dpi when I convert.

I'm not sure what DPI had to do with dot-matrix printers but it has everything to do with printing photos on paper with a press...

oldtool2 Loc: South Jersey

Mudshark wrote:

quote=snowbear DPI is actually a misnomer - it me... (show quote)

Basically the same thing. When they first came out you had to specify how many dot per inch you wanted the printer to use. I think it became a big selling point. My printer will do 240 dpi, so what, our manufacture does 241.

Jim D