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In
this picture, you can see wallabies lost somewhere, while there
is a huge amount of excessive, unused space that doesn't add a thing
to the photo, so it is high time we cropped it.

The
Crop tool is an incredibly simple device you can find in
the upper part of the Tools palette.
Draw
a rectangle around the part to be retained. You don't need to be
very accurate as the marquee's size can be changed afterwards. You
can see a dashed line around the area, with handles on the corners
and the midpoints.

By
dragging these, you can set the marquee to the size you want. Hold
Shift while dragging to retain the aspect ratio. Hold Shift
while originally using the Crop tool to make a square box.
The area around the marquee is darker. Naturally, these parts will
be discarded by the crop action.
Let's take a look at the more important options you can see at the
top of the dialog in newer versions of Photoshop:

Shield
toggles the above-mentioned darkening. The Color field lets
you choose the color for the darkening, while Opacity controls
how transparent it is. Perspective doesn't hold any importance
right now. We'll discuss it in another tip. Don't select it, though.
If
you have messed up anything (not as if you had anything to mess
up) or made up your mind, press Esc to cancel the selection.
If
you're done setting the proportions you want, press Enter,
or click the checkmark on the upper options bar. The unselected
parts of the picture are discarded. You can continue working with
the cropped version as you like.
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