TIFFGT(1) User Commands TIFFGT(1)

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 libtiff(3)
library.

For palette images (PhotometricInterpretation=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 PhotometricInterpretation 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-to-lsb 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 PhotometricInterpretation 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).

OPTIONS

-c Force image display in a colormap window.

-d Specify an image to display by directory number. By default
the first image in the file is displayed. Directories are
numbered starting at zero.

-e Enable reporting of error messages from the TIFF library. By
default tiffgt silently ignores images that cannot be read.

-f Force tiffgt to run as a foreground process. By default
tiffgt will place itself in the background once it has opened
the requested image file.

-l Force the presumed bit ordering to be LSB to MSB.

-m Force the presumed bit ordering to be MSB to LSB.

-o Specify an image to display by directory offset. By default
the first image in the file is displayed. Directories offsets
may be specified using C-style syntax; i.e. a leading ``0x''
for hexadecimal and a leading ``0'' for octal.

-p Override the value of the PhotometricInterpretation tag; the
parameter may be one of: miniswhite, minisblack, rgb, palette,
mask, separated, ycbcr, and cielab.

-r Force image display in a full color window.

-s Stop on the first read error. By default all errors in the
input data are ignored and tiffgt does it's best to display as
much of an image as possible.

-w Enable reporting of warning messages from the TIFF library.
By default tiffgt ignores warning messages generated when
reading an image.

-v Place information in the title bar describing what type of
window (full color or colormap) is being used, the name of the
input file, and the directory index of the image (if non-
zero). By default, the window type is not shown in the title
bar.

BUGS

Images wider and taller than the display are silently truncated to
avoid crashing old versions of the window manager.

SEE ALSO

tiffdump(1), tiffinfo(1), tiffcp(1), libtiff(3TIFF)

Libtiff library home page: http://www.simplesystems.org/libtiff/

libtiff September 20, 2005 TIFFGT(1)