7 Replies Latest reply on Nov 10, 2008 3:40 PM by (Bob_Q._Smith)

    Recommended file output dpi

      I have a Canon 40d and have used the Canon software, DPP to output some files. As in ACR, I can output to 16 bit tiffs. I've noticed a lot of the Canon people (on other forums) use 240dpi.
      I was wondering if anyone here has opinions as what to output their files from ACR should be. Wouldn't it be more "normal" to output your file from ACR at 300dpi?
        • 1. Re: Recommended file output dpi
          Thomas Knoll Level 2
          Output your file to WHAT??? Unless you specify, your question is meaningless.
          • 2. Re: Recommended file output dpi
            Level 1
            In ACR in CS3, there is a popup called "workflow options".
            I'm wondering which settings could be suggested as "normal" to send the file to CS3 for further adjustments. I'm assuming Prophoto space, 16 bits, no change to file size, and res. 300ppi. Since printing will be done at 300ppi, wouldn't it be ok to opt for it there rather than to specify it later in the workflow?
            • 3. Re: Recommended file output dpi
              John Joslin Level 6
              Output to what device ?
              • 4. Re: Recommended file output dpi
                Thomas Knoll Level 2
                Printing on WHAT? What printer model? What paper size? What paper type?

                Since you already decided that "printing will be done at 300ppi", it sounds like you already made up your mind. If so, why are you asking this question?
                • 5. Re: Recommended file output dpi
                  rasworth Level 1
                  Bob,

                  If I understand your question, the answer is it makes no difference. The ppi number at the bottom of ACR is divided into the actual pixel dimensions of your image, and the result is carried along as metadata in the form of vertical and horizontal dimensions. It has no effect upon your image and usually none on your workflow. Most of us leave it at the default 240.

                  Typically one edits the image at it's native pixel dimensions, those from the camera, until it's time to aim at a specific output device. At that time it is generally appropriate to specify the desired dimensions and resize to a ppi suitable for the output device.

                  Richard Southworth
                  • 6. Re: Recommended file output dpi
                    JimHess-8IPblY Level 3
                    A digital camera does not take pictures at any given resolution. The picture is taken with pixel dimensions. For instance, on my Nikon D40 to dimensions are 2000x3008 pixels. The only real value the resolution designation has is to give you an idea of how big the image will be at any given resolution. If you are going to print an image you will probably want to "squeeze" those pixels together to somewhere between 240-300 PPI to get an idea of how big your printed image will be. If you're going to display the image on your computer or on the Internet then 72 PPI should be adequate. But changing the PPI on a full-size image will not physically change the dimensions. You set the PPI according to the intention of use.
                    • 7. Re: Recommended file output dpi
                      Level 1
                      Thanks especially to Jim Hess and Richard Southworth.

                      I usually find it difficult to converse in online forums as opposed to "in person". I appreciate that you could understand my question though I probably didn't present it properly. I also appreciate the answers.