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Rotate 90
Rotate 90 is an option on the Digitizer Edit menu. The Digitizer requires images to be oriented vertically on the screen. However, scanned or other images may be in 'landscape' format so that they appear rotated 90-deg to the right. Before you can use Spectrum Capture with these images, you will need to rotate them into the proper orientation which is -90 deg to the left (or actually, 270 deg to the right). Select Rotate 90 as needed to orient the image properly.
An option to Deskew is also present on the Digitizer Edit menu. This enables you to align the image horizontally by small increments as needed. To normalize a skewed image, select Deskew and click on the spectrum's origin point, then click at the right end of the horizontal axis. The image will be rotated into an orthogonal position.