The following formula describes the approximate amount of memory used by GeoExpress to compress a single image to the MrSID Generation 4 (MG4) or MrSID Generation 3 (MG3) format:
Memory = ((8 + 4 × BlockSize + MIN(StripHeight, BlockSize)) × 4 + StripHeight) × NumBands × Width
The following list describes the variables used by the formula:
Memory
is the estimated memory usage in bytes.
BlockSize
is set by the user with the ‑blocksize
switch (See Advanced Encoding Options.)
MIN(StripHeight, BlockSize)
evaluates the values for the strip height and block size and equals whichever value is smaller.
StripHeight
is set by user with the ‑stripheight
switch (See Advanced Encoding Options and JPEG 2000 Encoding.)
NumBands
is the number of bands in the image to be encoded—typically 1 or 3 (This value is noted in the Properties tab.)
Width
is the width of the input image in pixels. (This value is noted in the Properties tab.)