What is the CellValue mean in SDO_GEOR_GRAYSCALE

hi!
What is the CellValue mean in SDO_GEOR_GRAYSCALE and SDO_GEOR_COLORMAP? If the Raster data is continuous, how to enum them when use the SetGrayScale function?

I don't have my doc with me, but, for instance, if your data is 8 bit unsigned then you would specify 0 to 255 for cell values, and map them to the grayscale. The requirement is that cell values be entered in ascending order, and gray scale values be between 0 and 255. There are two number arrays you fill in, one has the cell values (the actual numbers stored in the cells), the other has the gray scale values they map to.
Colormap works in a similar fashion, where you specify a cell value and r/g/b/opacity using five number arrays.

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