Turning Off Data Scaling
If your image data is already scaled for analysis, you may want to disable the automatic data scaling feature.
1. In the Controls Area deselect the Scale image values button.
 
note
When Scale image values is not selected, the Minimum value and Maximum value scales are disabled in the View Attributes dialog box.
2. Click Apply to accept the change, or OK to accept the change and dismiss the View Attributes dialog box.