| overinr4Dbgrnd%u -destroy
| destroy inrimage background
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| overinr4Dbgrnd%u -greyLevel min [glscale%u] | max [glscale%u] | min2 [glscale%u] | max2 [glscale%u]
| get/set each grey-level scale (min and max) associated to each image
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| overinr4Dbgrnd%u -ignoreVoxelSize %b
| get/set ignore voxel size flag
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| overinr4Dbgrnd%u -interpolation [nearest | bilinear ]
| get/set the interpolation mode for displaying images. By default the nearest neighbor method is used (nearest). Bilinear interpolation is also available
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| overinr4Dbgrnd%u -kind
| returns the name of the object kind associated with a given object
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| overinr4Dbgrnd%u -opacity [opascale%u]
| get/set the opacity scale
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| overinr4Dbgrnd%u -scalemode [affine|threshold|pet|red|green|blue]
| get/set the displayed grey-level transformation mode
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| overinr4Dbgrnd%u -scalemode2 [affine|threshold|pet|red|green|blue]
| get/set the displayed grey-level transformation mode for the second image
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