The following image files are included for testing. Note that a wide
variety of images can be generated using the tools provided with the
library (e.g. tiffcp, tiff2bw, tiffmedian, etc.); see below for some
hints on this.
PlanarConfiguration = 1 (packed data)
-------------------------------------
caspian.tif 279x220 64-bit floating point (deflate) Caspian Sea from space
cramps.tif 800x607 8-bit b&w (packbits) "cramps poster"
cramps-tile.tif 256x256 tiled version of cramps.tif (no compression)
dscf0013.tif 640x480 YCbCr digital camera image which lacks Reference
Black/White values. Contains EXIF SubIFD. No compression.
fax2d.tif 1728x1082 1-bit b&w (G3/2D) facsimile
g3test.g3 raw Group 3 encoded fax file
g3test.tif TIFF equivalent of g3test.g3 created by fax2tiff
jello.tif 256x192 8-bit RGB (lzw palette) Paul Heckbert "jello"
ladoga.tif 158x118 16-bit unsigned, single band, deflate
off_l16.tif 333x225 8-bit CIE LogL (SGILog) office from Greg Larson
off_luv24.tif 333x225 8-bit CIE LogLuv (SGILog24) office from " "
off_luv32.tif 333x225 8-bit CIE LogLuv (SGILog) office from " "
pc260001.tif 640x480 8-bit RGB digital camera image. Contains EXIF SubIFD.
No compression.
quad-jpeg.tif 512x384 8-bit YCbCr (jpeg) version of quad-lzw.tif
quad-lzw.tif 512x384 8-bit RGB (lzw) "quadric surfaces"
quad-tile.tif 512x384 tiled version of quad-lzw.tif (lzw)
strike.tif 256x200 8-bit RGBA (lzw) "bowling pins" from Pixar
text.tif 1512x359 4-bit b&w (thunderscan) am-express credit card
ycbcr-cat.tif 250x325 8-bit YCbCr (lzw) "kitty" created by rgb2ycbcr
smallliz.tif 160x160 8-bit YCbCr (OLD jpeg) lizard from HP**
zackthecat.tif 234x213 8-bit YCbCr (OLD jpeg) tiled "ZackTheCat" from NeXT**
** These images are in a deprecated format and are included only for testing
backwards compatibility. JPEG-encoded TIFF images use a different scheme
described in TIFF Technical Note #2 and implemented by libtiff.
PlanarConfiguration = 2 (separated samples)
-------------------------------------------
oxford.tif 601x81 8-bit RGB (lzw) screendump off oxford
The other images are from Hewlett Packard and exemplify the use of the
HalftoneHints tag (in their words):
The images are all the same subject, and should all appear the same
after rendering. Each of the images is slightly different as outlined
by the following table:
FileName ToneRange HalftoneHints
jim___cg.tif A Y
jim___dg.tif B N
jim___gg.tif B Y
The images with tone range A are 0-100% linear reflectance images,
in other words, fixed full gamut tone range. The images with tone
range B are what we call "normalized", meaning that the image has
been tone adjusted such the Highlight and Shadow are at gray levels
1 & 2**BitsPerSample-2.
Each of the three grayscale images should be rendered to look like
the halftone in pics/jim___ah.tif when printed on a Canon SX engine.
Generated Images
----------------
The file g3test.tif was created from g3test.g3 with the command:
fax2tiff -o t.tif -1 -p -M -R 98 g3test.g3
Tiled images can be created with tiffcp; e.g.
tiffcp -t -c none cramps.tif cramps-tile.tif
(but the tiled images included here were actually generated by the
Silicon Graphics Image Library).
The file quad-jpeg.tif was created from quad-lzw.tif with the command:
tiffcp -c jpeg quad-lzw.tif quad-jpeg.tif
To generate a tiled image with separated samples the following might
be used:
tiffcp -t -p separate quad-lzw.tif t.tif
[ Beware that tiffcp does not handle every format TIFF image. In particular,
when conversion between tiled and strip'd images is reliable only when
BitsPerSample is 8. ]
To generate a G4-encoded image with a single strip the following would work:
tiffcp -c g4 -r 1082 fax2d.tif t.tif
Contributing New Images
-----------------------
If you have images that are significantly different from those included
in this package and that do NOT HAVE A COPYRIGHT; feel free to send them
to me at sam@engr.sgi.com. I prefer to receive a URL to a location from
which I can retrieve the image by public FTP. However if that is not
possible you can send it to me in a mail message uuencode'd. Please do
not send large images by mail. Also, please do not send me an image
unless it is notably unique; e.g. not easily generated using the tools
I provide.
A. Molzer
701fcc46b8