You can replace the values of pixels or voxels in images by using the Replace pixel/voxel values command on the Utilities menu. Suppose, for example, that you have a set of images that contain not a number (NaN) values. To be able to use MIPAV algorithms on those images, you first need to replace those not a number values. The Replace pixel/voxel value command provides an easy way to replace those values or any pixel or voxel values.
To replace pixel or voxel value in images
1 Open the image whose pixels or voxels you want to change.
2 Select Utilities > Replace pixel/voxel values.
The Replace Pixel/Voxel Value dialog box (Figure 52) opens.
Replace Pixel or Voxel Value dialog box
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User-defined value
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Specifies the value that you want to replace in the image.
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Presets
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NaN-Not a number.  -Positive infinity. -Negative infinity. | |
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Replace with
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Accept the default value or type another value.
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New image
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Shows in a new image window the image in which the value was replaced.
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Replace image
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Replaces the current image with the image in which the value was replaced.
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OK
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Applies the parameters that you specified to subsample the image.
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Cancel
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Disregards any changes you made in this dialog box, closes the dialog box, and does not subsample the image.
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Help
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Displays online help for this dialog box.
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3 Do one of the following:
- a Select User defined value and type the value that you want to replace in the text box
< - b Select Presets and then select one of the following in the list box:
- NaN -Not a number
- -Positive infinity
- -Negative infinity
- NaN -Not a number
4 Do one of the following:
- Accept the default value in Replace with.
- Type another value in the text box.
5 Select one of the following:
- New image -To create a new image in its own image window using the replaced value
- Replace image -To overwrite the original image in the original image window with an image using the replaced value
6 Click OK. The image with the replaced value appears in either a new window or in the original image window.