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tiffgt - display an image stored in a TIFF
file (Silicon Graphics version)
tiffgt [ options ] input.tif
...
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 (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).
- -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.
Images
wider and taller than the display are silently truncated to avoid crashing
old versions of the window manager.
tiffdump(1)
, tiffinfo(1)
,
tiffcp(1)
, libtiff(3)
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