You can figure out what the options do by playing with them. It doesn’t matter if you’re not sure what the options do - the image will update in the background as you adjust these sliders, so you can see a preview of your color adjustments in real time. It’s useful for everything from fixing the color levels of an image to applying that old-timey sepia filter Instagram made trendy. The pane includes an overall color level graph you can modify as well as sliders for adjusting exposure, contrast, highlights, shadows, saturation, temperature, tint, sepia, and sharpness. Use the options on the pane that appears to adjust various color settings. The built-in Preview application also has a tool for adjusting the color levels or gamma of an image. Find the photo in your photo library that you'd like to edit and double-click on it. How to manually crop in Photos for Mac Launch the Photos app on your Mac. RELATED: Use Your Mac’s QuickTime App to Edit Video and Audio Files Click on Auto towards the bottom right of the screen. You can then click somewhere in the image to add text, draw a line, highlight an area, create a shape, or insert an arrow - whichever tool you’ve selected. Select a tool and it will replace the default “rectangular selection” tool. You can also click the Tools menu, point to Annotate, and select one of these tools in the menu.
Preview includes various image mark-up tools - the same ones that work in PDFs - which you can access by clicking the Show Markup Toolbar button near the top-right corner of the window.
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