Edit images with Apple’s Preview
Mac Tip #398, 19 August 2009
Preview, installed on all new Macs, can both open and display images, and edit and resize them too.
Use Preview to open images
Preview can open and display many image formats, such as
png, and even
Use the instructions in Open and Resequence PDFs with Apple Preview if you want to set Preview to always open a particular format.
Otherwise just select one or more images in the Finder and use
File menu > Open With to select Preview to open them. Preview.app opens and displays all the selected images in what looks like a PDF.
To crop unwanted material out of an image in Preview:
Select Toolfrom the
Toolsmenu. The cursor turns into a crosshair.
- Use the crosshair cursor to draw a rectangle around the area of the image you wish to keep. A dotted box with ‘handles’ appears.
- If you wish, drag the handles to new positions to more accurately select the area of the image to keep.
Toolsmenu. Preview crops the image.
It’s not immediately obvious, but Preview also provides tools that let you adjust exposure, brightness and a few other elements of an image. To access the adjustment Heads-Up Display (HUD) call up
Adjust Color from the
Tools menu. A dark semi-transparent window containing various sliders appears. That is the HUD.
Move the sliders to adjust your image. If you’re unhappy with what you’ve done, click the
Reset All button.
Reset All reverses any changes you’ve made.
Once you’re happy with the adjustments, close the HUD.
Resize an image
Photos straight out of my camera are almost 4,000 pixels wide and about 2,500 pixels tall. That’s way too big to email or put on a web page. Preview can resize images for you too.
To reszie an image choose
Adjust Size… from the
Tools menu. An
Image Dimensions dialog box appears.
Either enter a width and height that you like or choose a preset from the
Fit into drop-down menu.
Once you’re happy with your choices click the OK button. Preview resizes the image.
You may need to choose
Actual Size from the
View menu to see the resized image at its correct size.
Discard or Save changes
When you quit Preview a dialog box will advise you that you’ve made changes to the images. Choose to discard or save the changes.
Preview has a few other tricks you can use. A future Tip will explain more.
Remember to watch the movie (about 3.5 minutes) where I demonstrate some basic image editing:
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