6 Choose Imageo Adjustmentso Levels.

Doing so calls up the Levels dialog box.

The resulting histogram has changed again and shows more missing data points (that is, more and wider vertical white lines) due to additional loss of image data from the Curves adjustments.

Because the Curves dialog box adjusts the image data gradually all along the path of the curve, you can create smooth transitions across your images. By contrast, the histogram has only three markers (highlight, midtone, and shadow markers). This is why the Curve tool is typically the superior of the two tools for adjusting all the image data between the highlight and shadow points.

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