This guide shows how to find the somewhat hidden Paint-like tools in OS X Yosemite. They are available in Preview.
First step:
Open an image in Preview. Usually you can double-click an image file. If another app opens images by default, launch Preview from Applications.
Second step:
Click the toolbox at the lower right to show the Markup toolbar.
Selection tools include rectangular, elliptical, lasso and smart lasso.
Instant Alpha lets you remove an image's background.
You can draw and add arrows, shapes, text, signatures and more.
You can also adjust image size and scale.
There are options for editing colors and levels.
The tools are basic but useful for quick edits.
