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ionita_cn
Participant
April 17, 2019
Question

image size and 300 dpi resolution

  • April 17, 2019
  • 4 replies
  • 7539 views

Hi guys!

Using PH CS4

These are the steps I use for editing the images I then print on my Epson 400 printer, on canvas.

After I chose the images I need, I open them and crop them at 305/403 mm, the resolution setting is 300 dpi , it appears right next to the Height/Width.

I then make small retouches and save the file as JPEG image, using CTRL S command.

After editing all the images, I open Adobe Bridge and print my images from there. Bridge automatically saves images into PDFs and sends them to the printer, after I chose the image size according to the dimensions of my canvas.

My printer got broken few days back and asked one of my friends to print my images. They say they need to redimension the images, as the images don`t have 300 dpi. When I right click on one of them, at Details tab I see:  3602x4760 dimension and only 240 resolution. What happened? Did I do something wrong??

Please help, there are a loooot of images, and .. does he need to re-crop etc all of them  ?

Thank you so much

Cristina

    This topic has been closed for replies.

    4 replies

    B
    Community Expert
    Byron CortezCommunity Expert
    Community Expert
    April 17, 2019

    240 dpi is more than enough to print on a printer or a substrate that may not support them.

    Byron.
    D Fosse
    Community Expert
    D FosseCommunity Expert
    Community Expert
    April 17, 2019

    All you need to worry about is pixel dimensions - so many pixels wide x so many pixels high. That's your file. As long as you don't resample the file, it's the same.

    Ppi, pixels per inch, is probably the most misunderstood concept in all of digital photography. It's actually very simple, there's no magic to it. Just read it literally: pixels per inch. Say it out loud to yourself: pixels per inch.

    So you have your pixels in the file, a certain number of them. That's your image. Now, how many of them do you want to cram into one inch of paper? Do the math. The denser you print those pixels, the smaller the image is on paper.

    To get a good print, a certain pixel density is recommended. It doesn't have to be 300, there's nothing special about that number. It depends entirely on the viewing distance. The bigger it is, the farther away you will stand to take it all in. So ppi requirement drops with increased viewing distance.

      I
      ionita_cnAuthor
      Participant
      April 17, 2019

      So I understand the Resample option is the one that “allows” the file to

      modify itself? Sry, but even if I say a stupid question, I have to tell you

      I’m pretty new in PH. Thanks

      El El mié, 17 abr 2019 a las 20:16, D Fosse <forums_noreply@adobe.com>

      escribió:

      image size and 300 dpi resolution created by D Fosse

      <https://forums.adobe.com/people/D+Fosse> in Photoshop - View the full

      discussion <https://forums.adobe.com/message/11034045#11034045>

        gener7
        Community Expert
        gener7Community Expert
        Community Expert
        April 17, 2019

        Resampling simply add or subtracts pixels from your file. If it adds or "upsamples", Photoshop has to guess what those pixels will be.

        If you are new to this, Automatic is a good choice, until you learn more.

        I prefer not to touch the image. If I'm going to print at a certain size, I set my camera for max Megapixels or the scanner to at least 600 ppi.

        Scaling is where you uncheck "resample" and decide what size you will print. If the ppi is above 220, I think you will have a decent print. 300 is a holdover from offset presses. 240 ppi would be for a 4 color consumer inkjet. Scaling will not subtract or add pixels, it just decides the size on paper.  And as D. Fosse pointed out, if it's large, then that is reduced as you move away to take in the whole print.

        Here's the dialog with resample unchecked. You can adjust print dimensions (inches or cm) and see what the ppi will be.

        JohanElzenga
        Community Expert
        JohanElzengaCommunity Expert
        Community Expert
        April 17, 2019

        PPI (not DPI) is pretty meaningless, even when printing because modern printer drivers will automatically correct for it if you define the print size. The only thing that matters is the dimensions in pixels. 305mm @ 300 ppi = 300 x 305 / 25.4 = 3062 pixels, so your images have the correct size for printing. Your friend should simply ignore that 240 ppi and select the correct dimensions in mm, then the printer driver will automatically use 300 ppi.

        -- Johan W. Elzenga
        D
        Dynamic Office
        Legend
        April 17, 2019

        Resolution and DPI are not the same thing,

        May i ask why you need 300 dpi? I think 96 DPI would be fine, unless your intended audience are using magnifier glass to inspect your artwork?

        I
        ionita_cnAuthor
        Participant
        April 17, 2019

        Mm.. I print portraits on canvas. Apart from 30x40 cm size , I also print a

        42x57 size. I think the details in the iris or the ones from a curled hair

        look nice when there are more pixels. I must agree I am new working in PH.

        În mie., 17 apr. 2019 la 19:57, Dynamic Office <forums_noreply@adobe.com> a

        scris:

        image size and 300 dpi resolution created by Dynamic Office

        <https://forums.adobe.com/people/Dynamic+Office> in Photoshop - View

        the full discussion <https://forums.adobe.com/message/11033914#11033914>

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