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# bmp: supports bitmap files
These are .bmp files in DIB format. readbmp and writebmp use RGB values (single numbers). writebmp also accepts RGB triples main functions:
      readbmp      read bitmap file, returning RGB data
      writebmp     write bitmap file from RGB data
      readbmphdr   read header from bitmap file
Name | Type | Description
readbmp | verb | read bitmap file, returning RGB data
readbmpall | verb | read data from bitmap file
readbmphdr | verb | read header from bitmap file
writebmp | verb | write bmp file from RGB data
readbmpall
    read data from bitmap file
    returns:  bitsize, rows, columns, offset, sheader, data
readbmphdr
    read header from bitmap file
    returns:  bitsize, rows, columns
writebmp
    write bmp file from RGB data

    Form:  data writebmp filename [;minimum bitsize]

    picks appropriate bit size of 4 8 or 24, subject
    to optional minimum bit size.
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