9 Replies Latest reply: Dec 5, 2013 7:06 AM by Mike Gondek2 RSS

    dpi weirdness

    Zoë Woodworth Community Member

      I am confused about something. Say I create a new document in Illustrator and specify that it is 1" x 1" at 300 dpi. In the newly created document, I turn on rulers and it shows 1" x 1". Very good. However, when I go into preferences and switch the ruler units to pixels, it shows that my document is 72 px x 72 px. It *should* be displaying 300 px x 300 px, shouldn't it?

        • 1. Re: dpi weirdness
          KrisHunt Community Member

          ...and specify that it is 1" x 1" at 300 dpi.


          How is it you are specifying your document to be 300 dpi?

          • 2. Re: dpi weirdness
            Zoë Woodworth Community Member

            In the new document settings, under "advanced."




            Hmm, I am getting the feeling that maybe "Raster Effects" didn't mean what I thought it did. How *do* you specify dpi for a print document?

            • 3. Re: dpi weirdness
              KrisHunt Community Member

              Vector graphics are resolution-independent, so you don't.

              • 4. Re: dpi weirdness
                Zoë Woodworth Community Member

                What if the design includes photos as well? Should I be doing it in Photoshop instead?

                • 5. Re: dpi weirdness
                  KrisHunt Community Member

                  Sounds like a job for InDesign. But never fear; if you place a 300 ppi raster image in Illustrator, it will display at the correct size, even though Illustrator's ruler will say 72 pixels.

                  • 6. Re: dpi weirdness
                    Jacob Bugge MVP



                    What you have ticked is raster effect settings, which only applies to raster effects such as Effect>Blur>Gaussian Blur.


                    When you place a raster image (whether linked or embedded) it will be too large, but you can just change its dimensions to correspond to the desired resolution (for 300 PPI you can multiply the W or H value by 0.24 (that is 72/300) and Ctrl/CmdEnter to keep proportions.


                    The contents (number of pixels x pixels) will not be changed (no resampling).


                    And what Kris said.

                    • 7. Re: dpi weirdness
                      KrisHunt Community Member

                      I'm pretty sure she's dealing in inches (for a small print ad), though, not pixels, so there's no need to resize.

                      • 8. Re: dpi weirdness
                        emil emil Community Member

                        If the image or file contains information about its size in fixed size units (not pixels), it will be placed with this size according to ruler when set to fixed size units. If you resize it, Illustrator keeps the original number of pixels in a image which will result in different ppi which is also displayed in the Control bar when the image is selected. Have in mind that the ppi information there may become confusing or invalid if you rotate the image because Illustrator calculates this by mapping the original to the new bounding box of the image.

                        The pixel dimensions according to the rulers and input fields are used for the default image size when saving for the web and also for the pixel preview. When you print to a postscript printer all pixels of the placed images are used.


                        Copying and pasting from Photoshop places the image with the fixed size units not the pixel units according to the Photoshop ruler.

                        • 9. Re: dpi weirdness
                          Mike Gondek2 MVP



                          That settings does the same as changing effects > Doc Raster Effects Settings, which only applies to effects with btimapped results such as drop shadow. As other posters said, nothing else is affected.


                          Screen Shot 2013-12-05 at 8.58.04 AM.png


                          The reason Ilustrator converts 1" to 72 pixels, is Illustrator is also used for web work. Though Illustrator is predominatly used for print, print projects do not work in pixels ao the decision was made to go with 72 to make digital people happy.


                          You ask a good question, as I wonder what will happen years from now, when people do not even remember monitors started out at 72 dpi.