MX

Lock Aspect
Select the "Lock aspect" check-box to constrain the clip rectangle to a specific aspect ratio as you
drag. The radio buttons to the right of the check-box determine the aspect ratio used. Select "Current"
to maintain the aspect ratio to that of the photo before the clip. Note that the clip rectangle automatically
changes between landscape and portrait orientation as you drag a corner of the rectangle. So if you drag
sideways it tends to create a clip in landscape orientation. If you drag downwards more, then it will
create a clip region in portrait orientation.
The common preset crop aspect ratios are available of 4:3 (most consumer digital cameras and old-style
TVs and monitors), 3:2 (that of traditional film cameras and higher end SLR digital cameras), and 16:9
(aspect ratio of widescreen TVs).
You can override the lock-aspect option by using "Ctrl" while dragging. So if you're dragging out a clip
rectangle (or adjusting one) without aspect ratio lock, then holding "Ctrl" will lock the aspect to the last
selected aspect ratio. Similarly if you have lock aspect option on then "Ctrl" will temporarily un-lock the
aspect ratio.
Clipping in Photo Documents
In photo mode, there is a one-pixel grid applied to the photo (when at 96dpi, the default resolution) and
the clip rectangle snaps to this grid. This makes it very easy to get pixel exact clipping. For highly
accurate or exact pixel snapping, it's recommended to operate in photo mode and to zoom in so you can
see the pixels clearly.
See Photo documents
for more information.
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