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PDQuest User Guide Preview Window Transform Plot Frequency Distribution histogram Fig. 3-15. Transform dialog box. You can use regular viewing tools like Zoom Box and View Entire Image in the preview window to focus on particular regions of interest. You can also use Grab tool and arrow keys to move the image within the preview window. The Frequency Distribution histogram shows the total data range in the image and the amount of data at each point in the range. In a typical scan, there is a signal spike at the left (“gray”) end of the histogram due to background noise. The Transform Plot is a logarithmic representation of how the raw pixel data are mapped to the pixels of your computer screen. 3-22
