RAD Data comm FLM-1 Guide de l'utilisateur Page 212

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Quantity One User Guide
12-26
will then have the option of renaming your new image and changing the
version number.
If you are not satisfied with your rotated image, simply delete it and start
over.
Note: Because an image is composed of square or rectangular pixels, Custom
Rotation has to perform some minor smoothing on the image to turn it at
a non-90
o
angle. In addition, any analysis performed on the image cannot
be rotated and will be lost.
12.9 Subtracting Background from Entire
Images
There are a number of tools for subtracting background intensity from images
to improve the clarity of your data. This section describes background
subtraction for the entire image.
You can also subtract background from individual lanes (see Chapter 13) and
volumes (see Chapter 16).
Whole-image background subtraction is useful for reducing background
resulting from the opacity of the carrier medium (film, gel matrix, or blot
matrix) or film fogging.
Note: Whole-image background subtraction is an irreversible process. You will
be asked if you want to make a copy of the image before completing the
operation.
To open the dialog box for performing whole-image background subtraction,
select Image > Subtract Background.
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