How to Crop Photos in iPhoto on Your MacBook
In iPhoto on your MacBook, you can remove some of an image's border by cropping an image, just as folks once did with film prints and a pair of scissors. With iPhoto, you can remove unwanted portions from the edges of an image; it’s a great way to get Uncle Milton’s stray head (complete with toupee) out of an otherwise perfect holiday snapshot.
Follow these steps to crop an image:
Click the Crop button in the Edit toolbar.
Select the portion of the image that you want to keep.
In the Viewer, click and drag the handles on the rectangle to outline the part of the image that you want. Remember, whatever’s outside this rectangle disappears after the crop is completed.
When you drag a corner or edge of the outline, a semi-opaque grid (familiar to amateur and professional photographers as the nine rectangles from the Rule of Thirds) appears to help you visualize what you’re claiming.
You can expand the outline to the full dimensions of the image at any time — just click the Reset button.
(Optional) Choose a preset aspect ratio.
If you want to force your cropped selection to a specific aspect ratio — such as 4 x 3 or 16 x 9 for an iDVD project — click the Constrain check box and select that ratio from the Constrain pop-up menu.
Click the Done button.
Oh, and don’t forget that you can use iPhoto’s Undo feature if you mess up and need to try again. Just press Command+Z.
iPhoto features multiple Undo levels, so you can press Command+Z several times to travel back through your last several changes. Alternatively, you can always return the image to its original form (before you did any editing at all) by clicking the Revert to Original button.