NAME 

tiffgt - display an image stored in a TIFF file (Silicon Graphics version)

SYNOPSIS 

tiffgt [ options ] input.tif ...

DESCRIPTION 

tiffgt displays one or more images stored using the Tag Image File Format, Revision 6.0. Each image is placed in a fixed size window that the user must position on the display (unless configured otherwise through X defaults). If the display has fewer than 24 bitplanes, or if the image does not warrant full color, then RGB color values are mapped to the closest values that exist in the colormap (this is done using the rgbi routine found in the graphics utility library -lgutil.)

tiffgt correctly handles files with any of the following characteristics: 

BitsPerSample                1, 2, 4, 8, 16
SamplesPerPixel              1, 3, 4 (the 4th sample is ignored)
PhotometricInterpretation    0 (min-is-white), 1 (min-is-black), 2 (RGB), 3 (palette), 6 (YCbCr)
PlanarConfiguration          1 (contiguous), 2 (separate)
Orientation                  1 (top-left), 4 (bottom-left)

Data may be organized as strips or tiles and may be compressed with any of the compression algorithms supported by the (3) library.

For palette images (PhotomatricInterpretation=3), tiffgt inspects the colormap values and assumes either 16-bit or 8-bit values according to the maximum value. That is, if no colormap entry greater than 255 is found, tiffgt assumes the colormap has only 8-bit values; otherwise it assumes 16-bit values. This inspection is done to handle old images written by previous (incorrect) versions of libtiff.

tiffgt can be used to display multiple images one-at-a-time. The left mouse button switches the display to the first image in the next file in the list of files specified on the command line. The right mouse button switches to the first image in the previous file in the list. The middle mouse button causes the first image in the first file specified on the command line to be displayed. In addition the following keyboard commands are recognized:

b
Use a PhotometricIntepretation of MinIsBlack in displaying the current image.
l
Use a FillOrder of lsb-to-msb in decoding the current image.
m
Use a FillOrder of msb-tolmsb in decoding the current image.
c
Use a colormap visual to display the current image.
r
Use a true color (24-bit RGB) visual to display the current image.
w
Use a PhotometricIntepretation of MinIsWhite in displaying the current image.
W
Toggle (enable/disable) display of warning messages from the TIFF library when decoding images.
E
Toggle (enable/disable) display of error messages from the TIFF library when decoding images.
z
Reset all parameters to their default settings (FillOrder, PhotometricInterpretation, handling of warnings and errors).
PageUp
Display the previous image in the current file or the last image in the previous file.
PageDown
Display the next image in the current file or the first image in the next file.
Home
Display the first image in the current file.
End
Display the last image in the current file (unimplemented).