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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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