Edit an image in Keynote on Mac
After you add a photo or graphic to your presentation, you can crop it, remove parts you don’t want and make adjustments to its background and exposure.
Mask (crop) a photo
You can hide unwanted portions of an image without modifying the image file.
Double-click the image.
The mask controls appear. The default mask is the same size as your image.
Tip: To display the mask controls on a Mac with a Force Touch trackpad, force-click the image (press firmly on the trackpad until you feel a deeper click).
Use the controls to frame just the parts of the image you want to be visible.
Click Done.
To mask an image with a shape, click the image to select it, choose Format > Image > Mask With Shape, then choose a shape. Drag the handles on the shape to adjust its dimensions.
You can also mask an image with your own drawn shape. Hold down the Shift key while you click the drawing and image, select Format > Image > Mask with Selection, then drag the handles on the drawing to adjust its dimensions.
Remove background and other elements from a photo
Use the Instant Alpha tool to make parts of an image transparent. This feature is useful for removing an unwanted background or colour from an image.
Click the image to select it, then in the Format
sidebar, click the Image tab.Click Instant Alpha.
On the image, click the colour you want to remove, then drag slowly over it.
As you drag, the selection grows to include areas that use similar colours. Click and drag multiple times to remove multiple colours.
Remove all instances of the colour (even in other parts of the photo): Press the Option key while you drag.
Add colours back to an image: Press the Shift key while you drag.
Click Done or click Reset to undo all your changes and restore the image to its original state.
Adjust exposure, saturation and other image settings
Click the image to select it, then in the Format
sidebar, click the Image tab.Use the controls to make adjustments.
Exposure: Changes the overall brightness or darkness of the image.
Saturation: Changes the richness of colour in the image. Dragging to the right makes the colours richer or more vibrant.
Enhance: Automatically adjusts the image by spreading the red, green and blue tones evenly across the histogram.
To revert your adjustments, click Reset or click Reset Image in the Adjust Image window.
To see the image histogram and adjust more advanced features like contrast, highlights, shadows, sharpness, de-noise, temperature and tint, click
.
You can open the Adjust Image controls in a separate window that you can move anywhere. Choose View > Show Adjust Image (from the View menu at the top of your screen).
To restore the image’s original settings, click Reset or click Reset Image in the Adjust Image window.
To work with multiple images at the same time, hold down the Shift key while you click the images.
Tip: You can also add these buttons to the toolbar: Adjust Image, Instant Alpha and Mask.