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<title>TIFFGT</title>

TIFFGT

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

BUGS

SEE ALSO

NAME

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tiffgt − display an image stored in a

<small>TIFF</small> file (Silicon Graphics version)

SYNOPSIS

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tiffgt [ options ] input.tif ...

DESCRIPTION

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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

<small>RGB</small> 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:

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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)

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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:

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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 <small>TIFF</small> library when decoding images.

E

Toggle (enable/disable) display of error messages from

the <small>TIFF</small> 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.

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PageDown

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Display the next image in the current file or the first

image in the next file.

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Home

Display the first image in the current file.

End

Display the last image in the current file

(unimplemented).

OPTIONS

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−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

<small>TIFF</small> 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 <small>LSB</small>

to <small>MSB.</small>

−m

Force the presumed bit ordering to be <small>MSB</small>

to <small>LSB.</small>

−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

<small>TIFF</small> 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

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Images wider and taller than the display are silently

truncated to avoid crashing old versions of the window

manager.

SEE ALSO

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tiffdump(1), tiffinfo(1), tiffcp(1),

libtiff(3TIFF)

Libtiff library home page:

http://www.remotesensing.org/libtiff/