CAST Method of Photo Editing - Cropping
 
Motivation: Demonstrate the CAST method of basic photo editing.

Regardless of what photo editing software you decide to use (Adobe Photoshop Elements is being used here); there are series of regular steps which you will follow just about every time you edit a digital photo. The acronym CAST stands for Cropping, Adjust color, Sharpen and Touch-up summarizes the key basic steps of all good photo developers.

Digital photographers have the advantage that they can very quickly and rapidy process their images with powerful image processing software available to them. Yet over and over again - the same basic tools and processes are used. Cropping centers the focal attention of the image. Adjusting color and brightness is crucial but also the trickiest of tasks. Sharpening (or its opposite - deliberate blurring) can often mean the difference between good and great. And touch-ups - well they get us into the cheeky areas of "grooming" and "gardening". More on that later. First to cropping.

Cropping involves eliminating the extraneous and focusing on the primary subject matter of the photo. For example, in people shots, cropping close to the group eliminates distracting elements. There is a reason for the head and shoulders portrait, because it concentrates on putting the subject on the thirds. It is proven in reasearch psychology using eye tracing studies that people first scan images primarily at the thirds - that is starting at a third of the way down and a third of the way into the image. Then tested subjects tended to move to the next third over or down or follow key lines or objects emanating from the thirds position.

So there is psychological testing of fact behind the method of the thirds. Also like a short and sweet sentence - focus is better. Finally, cropping has the extra benefit of reducing the size of the file to be processed; and thus speeding up all subsequent editing operations. So many sessions begin with cropping down to the real points of interest.

In our cropping example , a photo from the Toronto Santa Parade is used. This turns out to be a challenging cropping assignment because there are many potential centers of interest.

There are the flags, the marching line, the smiling senior scout at the lower left - and the shivering, not quite prepared flag bearer just to the right of our senior scout. So lots of areas to catch our attention.

The two most distracting elements are the snow flakes and the parade watchers bundled in sleeping bags at the upper right - interesting, but too small to work with.

So our first cut at a crop is to catch the advancing line of marchers. This cuts off the flags whose tops form an arc. It also has some marchers legs cut off and others completely showing.

Finally, the crop of the picture looks slighty out of whack with so many lines leading into and out of the image at different angles but short lengths- it is all distracting. But we do get the subjects of interest our smiling senior scout, the shivering flagbearer and two girl guides in the front ranks who seem to have a better notion of "Be prepared" than their brethren scouts.

So our next crop concentrates on the flags. They bring color to the image and have a natural arch to them . So in this crop, the flags and their tips set the upper limits while the marchers hips are the lower cutoff line (so we don't have some marchers with legs cut-off and some not.).

However, now there is a loss here- our senior scout in the lower left along with one of the better prepared girl guides. Stretching out to catch her also brought in too much of the background building. Ditto for moving the crop on the right to catch all the flags. Finally it became obvious that this was not an image about flags; but about people carrying flags.

So our third trial crop went back to getting all the key people in but reducing the fuzz . First we did not try to capture the peak of the tallest flag but instead went for the second and third tallest flags to set our top crop line.

On the left we used the senior scout's shoulder as the next crop point. On the right we used the tip of the furling Canadian flag to set the right crop line.

But the bottom line proved problematic. The shivering flag bearer's white gloved fist proved to be set point for the bottom crop.

So now we have a reasonable crop - but as you can see by the process and reasoning process - there is no one best way or perfect crop, Rather the cropping should lend emphasis to the story you are trying to get the image to tell or maybe just hint at.

Taking that a point further, in our finished image, the shivering flag bearer seems to be shaking the whole scene - ah what fun photo editing can be.

One of the benefits of the cropping tool in Adobe Photoshop Elements is that the area of the image to be cropped away is darkened - this allows an artist to see better the to-

be-cropped image. In addition, like all of the major graphic editors PhotoShop Elements allow the cropping area to be moved around, the sides to be moved in and out to get exactly the right cropping. Photoshop even allows the cropping rectangle to be rotated which makes straightening out an image that much easier. And in fact, I use the strength of the cropping tool as an indicator of the overall quality of the program ....because the developers that spend time polishing the cropping tool must appreciate the importance of the tool and hopefully some of the other CAST graphic editing steps.



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