Exploring Very Large Images
Overview
If you are viewing a very large image, it might not load in imtool,
or it could load, but zooming and panning are slow. In either case,
creating a reduced resolution data set (R-Set) can improve performance.
Use imtool to navigate an R-Set image the same
way you navigate a standard image.
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Creating an R-Set File
To create an R-Set file from a TIFF or NITF image file, use
the function rsetwrite. For
example, to create an R-Set from a TIFF file called 'LargeImage.tif',
enter the following:
rsetfile = rsetwrite ('LargeImage.tif')rsetwrite saves
an R-Set file named 'LargeImage.rset' in the current
directory. Or, if you want to save the R-Set file under a different
name, enter the following:
rsetfile = rsetwrite('LargeImage.tif', 'New_Name')The time required to create an R-Set varies, depending on the
size of the initial file and the capability of your machine. A progress
bar shows an estimate of time required. If you cancel the operation,
processing stops, no file is written, and the rsetfile variable
will be empty.
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Opening an R-Set File
You can open an R-Set file from the command line, or directly
in the Image Tool. From the command line, type:
imtool('LargeImage.rset')From the Image Tool, select File > Open From R-Set.
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 | Using the Image Tool to Explore Images | | Using Image Tool Navigation Aids |  |
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