User guide

Viewing and Editing Images
12-17
Transform controls are automatically reflected in the Preview Window. They
are only applied to the main image when you click on OK.
You can use view tools like Zoom Box and View Entire Image in the Preview
Window just as you can in the main image window, to focus on particular
regions of interest. You can also use Grab and the ARROW keys to move the
image within the Preview Window.
Frequency Distribution Histogram
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.
Transform Plot
The Transform Plot is a logarithmic representation of how the raw pixel data
are mapped to the pixels of your computer screen.
12.7.b Transform Controls
Auto-scale
Clicking on the Auto-scale button will optimize your image automatically.
The lightest part of the image will be set to the minimum intensity (e.g.,
white), and the darkest will be set to the maximum intensity (e.g., black). This
enhances minor variations in the image, making fine details easier to see. You
can then “fine-tune” the display using the High, Low, and Gamma sliders
described below.
High/Low Sliders
If Auto-scale doesn’t give you the appearance you want, you can use the High
and Low sliders to redraw the image yourself. Dragging the High slider
handle to the left will make weak signals appear darker. Dragging the Low
slider handle to the right will reduce background noise.