|
|
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. |