void im_printdesc(image)
IMAGE *image;
char *im_Type2char( ty );
int ty;
char *im_BandFmt2char( bf );
int bf;
char *im_Coding2char( cod );
int cod;
char *im_Compression2char( comp );
int comp;
int im_char2Type( str );
char *str;
int im_char2BandFmt( str );
char *str;
int im_char2Coding( str );
char *str;
int im_char2Compression( str );
char *str;
im_printdesc(3) exports the functions it uses to code and uncode the type fields in image headers. The functions which return char * return a static string of the form "<bad Type>" on error,
The functions which return int return -1 on error, setting im_error(3).