If all you want is to quickly draw something on top of your existing image, Sketch is what you want.

Step 3: The Sketch tool allows you to draw freehand. Step 2: Next, the Instant Alpha tool lets you click an area of the image to “magically” select an entire region of a similar color. Two additional lasso tools cling to shapes as you select an area. There’s the standard rectangle for selecting an area, along with an elliptical selection tool. Here, you can select a portion of the image to move or edit. It controls what mode your cursor is in, with four individual options. Step 1: Selection Tools is the first tool on the left. However, read on for a quick rundown of each tool, starting from the left. The other tools should be fairly obvious if you’ve ever used an image-editing app. Changes are saved as you go, so if you want to keep the original image intact, consider making a copy of the image to edit before diving in. Step 3: If all you want is to quickly draw on your image, click the Pencil icon and get to it. MacBook won’t boot up? Here’s how to fix the problem Is your Mac acting strange? Here’s how to reset the PRAM and SMC Some users say the new MacBook Pro’s SD card slot simply doesn’t work

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