Use Assets : Repurposing Assets : Cropping Image Assets : Pixel Image Cropping Parameters
   
Pixel Image Cropping Parameters
For the cropping you can define parameters referring to:
Cropping Area
You can either set the aspect ratio of the cropping area, or its size in pixels, or you can allow the user to set the size (and implicitly, the aspect ratio) by using a mouse to draw a rectangle on the image preview.
Enforce aspect ratio
The aspect ratio of the cropping area is set to the specified value. However, the cropping user can still change the size and position of the cropping area on the image preview.
Enforce crop size
The size of the cropping area is set to the specified values for width an height. However, the cropping user can still change the position of the cropping area on the image preview.
User defined
The cropping user can determine size, aspect ratio, and position of the cropping area by drawing a rectangle on the image preview.
Output Size of Cropped Area
The final size of the output of the cropping process can be set to your needs, e.g. to enlarge or reduce the dimensions of the resulting image. To avoid distortion in the resulting image, make sure that the chosen values for width and height match with the chosen aspect ratio value.
Same as cropped area
The resulting image has the same width an height as the cropped area.
Set manually
The cropping user can enter values for the width an height of the resulting image on the image preview.
Enforce output size
The resulting image is always resized to the width and height values specified here.
Additional Options
For special purposes only!
Store coordinates of cropping area in subtable
Select this option and enter an name for the saved coordinate in the Crop name field if you want the values available. This will allow other applications to access these values and to repeat a cropping process with precisely the same result on a given asset.
The coordinates are only saved after a cropping has been performed for the first time. If you thereafter perform a cropping with different coordinates, the saved values will be overwritten, unless you have specified a new crop name.