| Icon | Name | Description |
|---|---|---|
|
Name Box | Name of the image. Can be edited if image unlocked. |
|
Look Up Table Box | Controls the current Look Up Table. |
|
DTI Display Combo | Selects DTI image display mode. Can be RGB or Lines. |
|
Lut File Open | Starts up File Open dialog for loading new Look Up Tables. |
|
Modulation Combo | Selects file to modulate DTI image with. |
Look Up Tables (LUTs) are colour maps that map the intensity value images to set colour ranges. Thus, if the Look Up Table is set to "Red to Yellow" then all voxels of the minimum value will be displayed as Reds and all voxels of the maximum value will be displayed as Yellows. Values between maximum and minimum will be allocated as appropriate.
Fslview is able deal with LUTs of more than one type. If a LUT file has a .lut extension the loaded lut colours will be allocated to values between the minimum and maximum voxel intensity. If a LUT file has a .rgb extension the loaded lut colours will be allocated to absolute voxel values. Using .rgb types of LUTs allows anatomical features to be displayed in predefined colours.
Examples of LUT files for users to download and edit:-
The three numbers in the .lut file refer to red, green and blue intensities where 0.0 is the minimum intensity and 1.0 is the maximum intensity.
The first number in the .rgb file is the intensity the colour is paired with. Then there is a string for describing the feature, eg Hippocampus. There then follow three numbers expressing the RGB colour intensities where 0 is the minimum and 255 is the maximum. The fourth number is not used in Fslview, it can just be set to zero.