The keyboard shortcuts that you know and love in Photoshop are the same in the Adobe Camera Raw (ACR) dialog box (when applicable). For example,Command (Mac) / Control (Win) + (plus) zooms in and (minus) zooms out. The other tool shortcuts are:
Z Zoom tool
H Hand tool
I White Balance tool (shift can temporarily activate the White balance tool – unless the crop tool is active)
S Color Sampler tool
C Crop tool
A Straighten tool
L/R Rotate image left/right (Command (Mac) / Control (Win) + “[“ or “]”will also rotate the selected images.)

Here are an additional dozen tips and shortcuts that I find extremely useful.
1. When starting from Bridge, if you choose File > Open in Camera Raw (or Command (Mac) / Control (Win) + R) to open Raw files, you are able to edit the files in the ACR dialog with out having Photoshop open. In addition,when finished making your changes,the default button is “Done”,and clicking it takes you back to Bridge. I like this feature so much that I set the Preferences > Advanced – “Double-click Edits Camera Raw Settings in Bridge”so that double clicking a Raw file in Bridge also edits in Bridge (without launching Photoshop).
2. Shift-double clicking on a Raw image in the Bridge will bypass the ACR dialog,applying either settings that have been saved with the file,or if there are no setting applied,opening the file with the camera defaults.
3. When entering a custom ratio for the Crop tool,selecting a measurement (inches for example) and combining that with a resolution (entered in the Workflow Options) allows for the creation of an image at a defined size (pixel count). Also worth noting, the Workflow Options also have the option to open a raw file directly into Photoshop as a smart object.
4. Command (Mac) / Control (Win) + U applies the Auto Adjustment to an image.
5. To delete a single Color Sampler, position the cursor over the Color Sampler while holding the Option (Mac) / Alt (Win) key. When the icon changes to a pair of scissors,click to “cut”(delete) the Color Sampler. Holding down the Shift key temporarily toggles the Color Sampler tool to the White Balance Eyedropper.

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