Change colors: Change the color of any shape content using this tool.Border colors: Change the color of any shape borders you might have applied using this tool.Line: Change line thicknesses applied using Preview’s tools here.Adjust Color includes adjustment sliders for exposure, contrast, highlights, shadows, saturation, color temperature, tint, sepia, and sharpness. If working with images the Adjust Color tool is available in this position. Note or Adjust Color: When working with PDFs a tool that lets you add notes to documents appears here.Sign: This tool lets you sign documents if possible in the document you are using.
You can edit font, size, and color using the Text Style tool to the right of this tier of the toolbar.
Text: Tap this box to enter text, then drag the text to where you want it to be. This is force sensitive and lets you draw thicker shapes in reaction to the pressure of your touch. On Macs with a Force Touch touchpad, a second Draw tool appears. If Preview recognizes a shape you draw it will choose that instead. 
There is also a Loupe tool which you can use to magnify an area of your image, just drag the green handle to decrease or the blue handle to increase magnification.
Shape Tools: You can add rectangles, stars, and other shapes. Press delete to make this part of the image transparent or tap Command+C to copy your selection, making it available in Clipboard. The more you drag the cursor the more of the image will be highlighted in red to show you have selected it. Just click the area you want to select and drag your cursor. Instant Alpha: For some image types you can use this tool to automatically select the background or other objects within an image. When working with a PDF this becomes a rectangular selection tool. It also provides Lasso and Smart Lasso selection tools, on which more below. The Selection Tool: This lets you choose to select an item using a Rectangular or an Elliptical tool. This tool is not available here when working with images. Text Selection: When working with a PDF a text selection tool sits at the far left.
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