Align Vertical
The Align Vertical command reorients the image or image set to align a manually drawn line to a vertical reference. As shown below, the line is stretched along one dispersion of an echelle spectrum. If you make a mistake, use Ctrl+Z to restore the original unrotated image or image set.
Initiate this interactive command from the Process > Alignment menu.
After launching the command, a Hint Window appears at the top of the screen, reminding you to mark the beginning corner (with the left mouse button down) and stretch the reference line along the direction of rotation. As soon as you launch the command from the menu or toolbar, the command is live and expects a line to be drawn on the image. However, the live command can be aborted at any time using the Escapekey or by right-clicking the mouse. The Hint Window can be moved and resized for the next time it opens and can be disabled/enabled using the checkbox in the General Properties dialog (Ctrl+R).
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