A simple description of the demos contained in this directory:
This info was taken from the html documentation that comes with libtiff



tiffinfo
    Display information about one or more TIFF files.
tiffdump
    Display the verbatim contents of the TIFF directory in a file (it's very
    useful for debugging bogus files that you may get from someone that
    claims they support TIFF)
tiffcp
    Copy, concatenate, and convert TIFF images (e.g. switching from
    Compression=5 to Compression=1)
tiff2ps
    Convert TIFF images to PostScript
tiffcmp
    Compare the contents of two TIFF files (it does not check all the directory
    information, but does check all the data)
tiff2bw
    A simple program to convert a color image to grayscale
ras2tiff
    A quick hack that converts Sun rasterfile format images to TIFF -- it's
    less than complete
rgb2ycbcr
    Convert an RGB, grayscale, or bilevel TIFF image to a YCbCr TIFF image;
    it's mainly provided for testing
gif2tiff
    A quick hack that converts GIF 87a format images to TIFF
ppm2tiff
    A quick hack that converts PPM format images to TIFF
fax2tiff
    Convert raw Group 3 or Group 4 facsimile data to TIFF
pal2rgb
    Convert a Palette-style image to a full color RGB image by applying the
    colormap
tiffdither
    Dither a b&w image into a bilevel image (suitable for use in creating fax
    files)
tiffsplit
    Create one or more single-image files from a (possibly) multi-image file
fax2ps
    Convert a Group 3- or Group 4- compressed TIFF to PostScript that is
    significantly more compressed than is generated by tiff2ps (unless
    tiff2ps writes PS Level II)
thumbnail
    Copy a bilevel TIFF to one that includes 8-bit greyscale "thumbnail
    images" for each page; it is provided as an example of how one might use
    the SubIFD tag (and the library support for it)
tiffmedian
    A version of Paul Heckbert's median cut program that reads an RGB TIFF
    image, and creates a TIFF palette file as a result; it's useful for
    converting full-color RGB images to 8-bit color for your friends that 
    have cheapo 8-bit framebuffers.
sgi2tiff
    A program to convert SGI image files to TIFF. This program is only useful
    on SGI machines as it uses -limage.