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T
Trendssoul
Participant
June 3, 2023
Answered

300dpi

  • June 3, 2023
  • 2 replies
  • 4185 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

        davescm
        Community Expert
        davescmCommunity Expert
        Community Expert
        June 7, 2023

        Thanks again for the effort, yet it again seems to ignore a main question...?

        Are you "betting your life" that my 1500 x 2100 px for a 5 x 7 inch photo, printed from Photoshop, assigned 30 ppi instead of 300 ppi (resampling left unchecked), will in any case print visibly worse instead of the expected quality...?

        I think I've in the mean time seen equally experienced guys like you be on my side, so one thing we can always be sure of: some seasoned veterans will never get it.

        Until I do my own test, I'll remain open to who they will be...


        @Zesty_wanderlust15A7  said 'Thanks again for the effort, yet it again seems to ignore a main question...?

        Are you "betting your life" that my 1500 x 2100 px for a 5 x 7 inch photo, printed from Photoshop, assigned 30 ppi instead of 300 ppi (resampling left unchecked), will in any case print visibly worse instead of the expected quality...?'

         

        A 1500 x 2100 px for a 5 x 7 inch photo assigned 30 ppi instead of 300 ppi becomes a 50 inch x 70 inch photo. Viewed close you will now see those pixels but you don't view such a large image up close. You step back to see it.

        The 5 x 7 inch print 300ppi viewed from 22.9 inches will look identical to the 50 x 70 inch print at 30ppi viewed from 229 inches. The information in each pixel has not changed, the number of pixels making up the image has not changed, and each image pixel takes up the same amount of space on the retina of your eye.

         

        D Fosse has used a great picture in the past to demonstrate this point, but I can't find a link to it at present.

         

        Dave

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