Step 1: Open File

■ Choose File >- Open (Ctrl+O) to display the Open dialog box. Double-click the \11 folder to open it and then click the owl-before.tif file to select it. Click Open to open the file.

■ Choose View ^ Actual Pixels (Ctrl+Alt+0). Press the Spacebar to get the Hand tool and

drag the image so that you can see the grain in the upper-left corner of the image. All those little colored specs are noise that we want to minimize.

Compare this noise to the noise in the iris images shown in Techniques 1 and 3, which were shot using ISO 100 instead of ISO 800. This comparison shows the value of using low ISO speeds.

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