The description and verbose output go to standard error.

The basic input switches are described in dcintro(1). Options specific to this program are:

-h|histogram

Display table of pixel value, frequency, probability, contribution to zero order entropy, and cumulative zero order entropy. May generate a LOT of output !

-csv

Display only a comma separated value pair of pixel value and frequency, one line per value, e.g., for import into a statistical program or spreadsheet

-withhighbits

Include as well the values that are above Bits Stored and within Bits Allocated, such as might be overlay bits (regardless of whether or not there are any 60xx group elements).

-highbitsonly

Use instead the values that are above Bits Stored and within Bits Allocated, such as might be overlay bits, and treat all valid pixel values below Bits Stored inclusive as zero (regardless of whether or not there are any 60xx group elements).

-v|verbose

Display byte offset from file start and message start, in hexadecimal, and dump contents while reading and once read.

-filename

Show the name of the file supplied in the arguments; a hyphen will be reported if no filename was supplied.