Use this to crop whole batches of pictures at once using predefined criteria.
To reach this window from the Editor or Browser, use Edit | Specific Crop… [Ctrl+Shift+W]
Use the Height and Width fields to set the crop size in pixels. Use the square of dots to anchor the crop to a corner, side, or the middle. Use Preserve ratio to ensure that the cropped version of each picture will have the same ratio of sides as the original did.
Use the Ratio of Sides dropdown to set the crop to a fixed size in pixels or a fixed ratio of sides. Click Swap Values (shown between the two sizes or ratios) to swap the two values, switching the crop from Portrait to Landscape or vice-versa.