PROBLEM
IKONOS 11-bit panchromatic images display as 'noise' or 'salt and pepper' in Workstation ArcInfo.
This is a result of the wrapping of the 256 value black-to-white greyscale ramp to cover the 0 to 2048 value range of the input image.
Most display devices are limited to 256 shades of gray, so having 2048 possible values in the data would provide no benefit. The larger range of values is only really useful for spectrographic analysis.
Note that the 11-bit data is packed into a 16-bit image file. That is, the image values are packed into the first 2048 values, with the remainder (up to the maximum of 65536) being unused.
Code:
Arc: IMAGEGRID iko_11 img_grd
Code:
Grid: iko_slice = SLICE (img_grd, EQINTERVAL, 256, 0)
Code:
Arc: GRIDIMAGE iko_slice # iko_8 TIFF
Code:
Arc: IMAGEGRID iko_11 img_grd
Code:
Arc: GRIDIMAGE img_grd # iko_bil BIL
Article ID:000002079
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