Master the Crop Tool
Fine-tune your compositions with one of Photoshop’s most versatile tools.
This menu allows you to constrain the Crop Tool to a particular shape. Choose Original Ratio (called Use Photo Ratio in Elements) to set the dimensions to that of the original. If you want a more freehand route, set it to No restriction, Unconstrained or Clear and you’ll be able to draw out the crop box in any ratio that you want.
When set to Original Ratio (or similar) the original photo’s resolution will be picked up by the tool, but you can also set the post-crop resolution manually, increasing or decreasing its file size.
There’s a host of overlay options to help you recompose when cropping. The Rule of Thirds grid is probably the most useful, dividing the frame into nine equal boxes.
DELETE CROPPED PIXELS
With this box ticked you’ll lose any overhanging pixels when you apply the crop and also reduce the file size. But you can untick this option if you wish to keep the full original and recrop at a later date. This will require the image to be saved as a PSD file and take up more hard drive space.