A. Molzer
701fcc46b8
Two tests are disabled, both related to tiles, since they do not follow the fully released spec themselves but incidentally decode with libtiff anyways. The two images (`cramps-tile.tif`, `quad-tile.tif`) are tiled layout which libtiff detects by the presence of TileWidth/TileHeight tags. We would detect that by chunks encoded via TileOffsets and TileByteLengths tags. However the images encoded their chunk data into the StripOffsets tag; additionally they contain a RowsPerStrip value anyways. Tests disabled as this is to be resolved in a separate issue (#338) with a decision on treatment of this situation (strictness setting or copying libtiff, also error late for mismatched lengths).
102 lines
4.2 KiB
Plaintext
102 lines
4.2 KiB
Plaintext
The following image files are included for testing. Note that a wide
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variety of images can be generated using the tools provided with the
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library (e.g. tiffcp, tiff2bw, tiffmedian, etc.); see below for some
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hints on this.
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PlanarConfiguration = 1 (packed data)
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-------------------------------------
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caspian.tif 279x220 64-bit floating point (deflate) Caspian Sea from space
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cramps.tif 800x607 8-bit b&w (packbits) "cramps poster"
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cramps-tile.tif 256x256 tiled version of cramps.tif (no compression)
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dscf0013.tif 640x480 YCbCr digital camera image which lacks Reference
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Black/White values. Contains EXIF SubIFD. No compression.
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fax2d.tif 1728x1082 1-bit b&w (G3/2D) facsimile
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g3test.g3 raw Group 3 encoded fax file
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g3test.tif TIFF equivalent of g3test.g3 created by fax2tiff
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jello.tif 256x192 8-bit RGB (lzw palette) Paul Heckbert "jello"
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ladoga.tif 158x118 16-bit unsigned, single band, deflate
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off_l16.tif 333x225 8-bit CIE LogL (SGILog) office from Greg Larson
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off_luv24.tif 333x225 8-bit CIE LogLuv (SGILog24) office from " "
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off_luv32.tif 333x225 8-bit CIE LogLuv (SGILog) office from " "
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pc260001.tif 640x480 8-bit RGB digital camera image. Contains EXIF SubIFD.
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No compression.
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quad-jpeg.tif 512x384 8-bit YCbCr (jpeg) version of quad-lzw.tif
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quad-lzw.tif 512x384 8-bit RGB (lzw) "quadric surfaces"
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quad-tile.tif 512x384 tiled version of quad-lzw.tif (lzw)
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strike.tif 256x200 8-bit RGBA (lzw) "bowling pins" from Pixar
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text.tif 1512x359 4-bit b&w (thunderscan) am-express credit card
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ycbcr-cat.tif 250x325 8-bit YCbCr (lzw) "kitty" created by rgb2ycbcr
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smallliz.tif 160x160 8-bit YCbCr (OLD jpeg) lizard from HP**
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zackthecat.tif 234x213 8-bit YCbCr (OLD jpeg) tiled "ZackTheCat" from NeXT**
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** These images are in a deprecated format and are included only for testing
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backwards compatibility. JPEG-encoded TIFF images use a different scheme
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described in TIFF Technical Note #2 and implemented by libtiff.
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PlanarConfiguration = 2 (separated samples)
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-------------------------------------------
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oxford.tif 601x81 8-bit RGB (lzw) screendump off oxford
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The other images are from Hewlett Packard and exemplify the use of the
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HalftoneHints tag (in their words):
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The images are all the same subject, and should all appear the same
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after rendering. Each of the images is slightly different as outlined
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by the following table:
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FileName ToneRange HalftoneHints
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jim___cg.tif A Y
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jim___dg.tif B N
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jim___gg.tif B Y
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The images with tone range A are 0-100% linear reflectance images,
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in other words, fixed full gamut tone range. The images with tone
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range B are what we call "normalized", meaning that the image has
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been tone adjusted such the Highlight and Shadow are at gray levels
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1 & 2**BitsPerSample-2.
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Each of the three grayscale images should be rendered to look like
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the halftone in pics/jim___ah.tif when printed on a Canon SX engine.
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Generated Images
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The file g3test.tif was created from g3test.g3 with the command:
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fax2tiff -o t.tif -1 -p -M -R 98 g3test.g3
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Tiled images can be created with tiffcp; e.g.
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tiffcp -t -c none cramps.tif cramps-tile.tif
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(but the tiled images included here were actually generated by the
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Silicon Graphics Image Library).
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The file quad-jpeg.tif was created from quad-lzw.tif with the command:
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tiffcp -c jpeg quad-lzw.tif quad-jpeg.tif
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To generate a tiled image with separated samples the following might
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be used:
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tiffcp -t -p separate quad-lzw.tif t.tif
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[ Beware that tiffcp does not handle every format TIFF image. In particular,
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when conversion between tiled and strip'd images is reliable only when
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BitsPerSample is 8. ]
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To generate a G4-encoded image with a single strip the following would work:
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tiffcp -c g4 -r 1082 fax2d.tif t.tif
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Contributing New Images
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-----------------------
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If you have images that are significantly different from those included
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in this package and that do NOT HAVE A COPYRIGHT; feel free to send them
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to me at sam@engr.sgi.com. I prefer to receive a URL to a location from
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which I can retrieve the image by public FTP. However if that is not
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possible you can send it to me in a mail message uuencode'd. Please do
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not send large images by mail. Also, please do not send me an image
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unless it is notably unique; e.g. not easily generated using the tools
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I provide.
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