Projected Digital Images (PDIs)

PDIs have replaced the old “classic” slide.  Basically it is a digital file, normally a JPEG, which can be shown on the club’s digital projector.  File are generally small allowing easier transmission by email and uploading/processing by the projector.  We have guidelines on sizing and naming of PDI files for competitions as set out below:

PDI formatting guide

  1. Choose your PDI and print entries based on how they will best look to the judges. Bear in mind that prints can display finer detail; and the vibrance, contrast etc. will influence how best your image will look either on paper or on a screen.
  2. Once you have chosen which images to enter as PDIs you should first crop them, if appropriate, to fit the shape of the display frame
  3. The frame ratio is 4 x 3 wide by high. So, if you want to use all the available pixels (dots) on the screen you should format your images in a 4 x 3 frame ie landscape format
  4. If your image is not ideally suited to that shape (such as portrait, square or letter-box) then the image must fit in a 4 x 3 frame but with blank edges on the top/bottom or at the sides. In this case skip to step 6.
  5. This step is taken if you have decided to use the whole 4 x 3 ratio frame for your image, so you must crop your image accordingly. A 35mm camera (and many digital cameras) produces a 3 x 2 image so, for it to fit in a 4 x 3 frame, you need to crop a bit off the sides, at least. Of course, you may choose to crop more than that to zoom in on the portion of the original image that you wish to focus the viewer on. Just select a 4 x 3 crop in your software and you will end up with an image that fills the PDI frame.
  6. Now, if necessary, make whatever edits you like before worrying about reducing the number of pixels to fit the 1600 x 1200 PDI format
  7. Before you shrink your image to enter as a PDI you probably should save it at this point preserving the full-resolution version of your image for future use. The next step will (probably) create a smaller file and will lose image detail that you might want to preserve should you wish to make an enlarged print in the future.
  8. Finally, you need to compress you image to fit inside a 1600 x 1200-pixel frame. If you’re struggling with the maths, and how to get it right, follow these steps:
    • Find the place in your software where the image size can be changed. Below are examples for three image processing programs. An important step is constraining the proportions/locking the aspect ratio/linking height and width. These all mean the same thing: when you change one dimension, the other will change as well.
    • The format for PDIs is 1600 X 1200. That means no more than 1600 pixels wide and no more than 1200 pixels high.
    • If your image is square or portrait format, it’s easy. Set the height to 1200 pixels. The width will change to a value less than 1600. Job done! Save it as a JPEG.
    • If your image is landscape format, set the width to 1600 pixels. Check the new height; if it’s 1200 pixels or less, save it as a JPEG. If it’s more than 1200 pixels set the height to 1200 pixels. Save it as a JPEG.


    Photoshop Elements:



    >Image size

    Make sure the Constrain Proportions box and the Resample Image box are both ticked. The Pixel Dimensions area is at the top of the panel. You can now set the number of pixels in width or height and the other will change as well.


    Corel Paint Shop Pro:



    Make sure the Lock Aspect ratio box near the bottom of the panel is ticked. The Resample using: box should also be ticked. The Pixel Dimensions area is in the middle of the panel. Select Pixels in the drop down list. You can now set the number of pixels in width or height and the other will change as well.




    >Scale Image

    Make sure the link connecting the width and height boxes is set on (you may have to look very carefully). You can now set the number of pixels in width or height and the other will change as well.




    Export Location: select the folder you want the image to go to.

    File Naming: insert the name.

    File Settings: select JPEG and set Quality to 100.

    Image Sizing: tick Resize to fit. Select Width and Height. Set W to 1600 and H to 1200.

    Output Sharpening: Leave blank or set to Screen, as you wish.

    Skip the next three sub-panels.