Digital Resizing

Digital images are made up of pixels; and there can be many millions of them. How many depends on the resolution set in the camera when we took the shot. Roughly though, it’s around the 24 million mark. However, after we have processed the image and wish to project it in an impeccable fashion, we have to get those pixels down to a maximum of 1,470,000 for our projector and the ones used in external competitions.

Digital projectors do not need to be has high a resolution as monitors, simply because at the distance we view the images at a lot of detail would not be seen. Moreover when we bring the image size down we can – if not done right – produce a jaggy effect, especially notable when it comes to diagonal lines.

In the competition rules there are guidelines on what is expected, but I am going to show you how to achieve it.

The competition rules state that we need an image that is a maximum of 1400 pixels across and a maximum of 1050 vertically, these are the outer bounds of the new image. It can be any shape you want as long as it does not go out of these bounds.

What we have to do now, is select the image you wish to submit to the competition, then from the menu of your photo editor you need to select the option that allows you to reconfigure the image size. In Photoshop the menu options are ‘Image’, then ‘Image size’.

Please be aware that most image editing software packages do this in essentially the same way. From here its just a few simple steps.

On the toolbar, click on Image, scroll down to you see Image Size and click on that. You will see the left hand dialogue box appear.

Now this image happens to be in landscape format so the largest size is the one that concerns us, right now its 3795 pixels wide, we would like it to be 1400. Now ensuring that the Constrain Proportions box is ticked we can simply type in 1400 in the width box. You will see that the height of the image automatically adjusts. You will see that the document size shrinks to a more manageable 3.74 megabytes.

Ensure too that the Bicubic resampling is ticked, we are after all reconstructing your image and this ensure the best way to retain tone gradients. Click on OK.

If the image is a portrait format – as in the waterfall image – then we must adjust the value in the Height box. Type in the maximum value of 1050, and again we see the Width value adjust automatically.

You may wish to re-sharpen your image slightly as it has just been re-sampled.

Now save it under a different file name and make it a jpg. Refer to the current club rules on the current definition of the file naming conventions.

Oh and another thing, these are the maximum sizes, it is advisable that your images meet at least one of these sizes. If your image is smaller than this then when it is projected it will appear smaller on the screen when projected.

Technical stuff.

JEPG or Jpg – A compressed graphic format standardised by the Joint Photographic Experts Group (JPEG); supports up to 24-bit color, which makes JPEG a good format for storing digital photos; compressed using lossy compression, which may noticeably reduce the image quality if high amounts of compression are used.