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T
Trendssoul
Participant
June 3, 2023
Answered

300dpi

  • June 3, 2023
  • 2 replies
  • 4181 views

I'm sure I'm asking a simple question
how do i do my photoshop work as 300 dpi image jpg
thanks 

This topic has been closed for replies.
Correct answer TheDigitalDog

There is zero difference in a document that is 1000x1000 pixels (as an example) at 72 dpi (PPI) or 300 dpi (PPI) or any such value. All are 1000x1000 pixels and the dpi/ppi is simply a metadata tag. 
This very, very old primer on resolution still seems necessary to post, this may help in understanding this tag:
http://digitaldog.net/files/Resolution.pdf

2 replies

TheDigitalDog
TheDigitalDogCorrect answer
Inspiring
June 3, 2023

There is zero difference in a document that is 1000x1000 pixels (as an example) at 72 dpi (PPI) or 300 dpi (PPI) or any such value. All are 1000x1000 pixels and the dpi/ppi is simply a metadata tag. 
This very, very old primer on resolution still seems necessary to post, this may help in understanding this tag:
http://digitaldog.net/files/Resolution.pdf

Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    T
    TrendssoulAuthor
    Participant
    June 4, 2023

    really interesting and thanks for this information

    Ged_Traynor
    Community Expert
    Ged_TraynorCommunity Expert
    Community Expert
    June 3, 2023

    @Trendssoul unless you're going to print your images, there's no need to change the DPI, if you do want to change it you can do that from the Image > Image Size menu

    https://www.adobe.com/uk/creativecloud/photography/discover/dots-per-inch-dpi-resolution.html

      jane-e
      Community Expert
      jane-eCommunity Expert
      Community Expert
      June 3, 2023

      I hadn't seen that link before, @Ged_Traynor , but I like that it first correctly defines DPI and only later explains the difference between PPI and DPI!

       

      What does DPI stand for?

      DPI stands for Dots per Inch, referring to the number of ink droplets a printer will produce per inch while printing an image. The more dots of ink per inch the picture has, the more detail you will see when printed.

       

      How does DPI differ from PPI?

      PPI (Pixels per Inch) refers to the number of pixels that make up every inch of a digital image. It’s used to describe image resolution on a screen, rather than in print. DPI, meanwhile, refers to number of dots in every inch and is generally used for print purposes.

       

       

      Jane

        D Fosse
        Community Expert
        D FosseCommunity Expert
        Community Expert
        June 4, 2023

        That part is simple, but you don't answer my question.

        We usually hear the ppi field has no importance for printing; it's the pixels that matter. That is easy to understand for me, and what I have always agreed with (I did reserve a place in my mind where some printer might use this info, as so many seem unware or confused by this.).

        Dave seems to suggest we do have to use this field wisely when printing?  Then show me an example.

        Like, my pic is 1800 x 1200 px and I want it printed at [size], so seeing my printer is [??] dpi, I set ppi at [??].

        I may be misunderstandng Dave, but if it wasn't confusing, I wouldn't.

        If this was required, I would suspect PS would have a field where you could provide the dpi of the target printer, so PS can recalculate the ppi and spare you the math.


        Setting a ppi number defines a physical print size. Without a ppi number, the size would be undefined.

         

        It doesn't really matter where the actual calculation is performed. You need a print size, and the ppi number gives you that.

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