If a Curves Adjustment layer is targeted in the Layers panel, selecting the flyout on the Adjustments panel reveals the “Curves Display Options”. Here, you can choose to show your numeric values on a scale from 0-255 (light) or 0-100% (ink), Channel Overlays, Histogram, Baseline and Intersection Line.
In this video tutorial (Adobe Camera Raw in Photoshop CS4), Julieanne Kost goes over the time saving advantages and amazing functionality Camera Raw 5 provides you in Photoshop CS4.
When using the Point curve (in the Tone Curve panel) many of the shortcuts that work in Photoshop also work in Camera Raw. For example, Command (Mac) / Control (Win) -click in the preview are to set a point on the curve. Then, use the arrow key (up and down, left and right) to reposition the curve (add the shift key to move in larger increments). To select multiple points in the Curves panel, Shift click the points on the curve. In addition, Control + Tab will move to the next point on the curve (yes, it’s the same shortcut on both Mac and Win).
