$Header: /d1/sam/tiff/pics/RCS/README,v 1.6 1997/09/02 19:07:22 sam Exp $ 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) ------------------------------------- pics/cramps.tif 800x607 8-bit b&w (packbits) "cramps poster" pics/cramps-tile.tif 256x256 tiled version of cramps.tif (no compression) pics/fax2d.tif 1728x1082 1-bit b&w (G3/2D) facsimile pics/g3test.g3 raw Group 3 encoded fax file pics/g3test.tif TIFF equivalent of g3test.g3 created by fax2tiff pics/jello.tif 256x192 8-bit RGB (lzw palette) Paul Heckbert "jello" pics/off_l16.tif 333x225 8-bit CIE LogL (SGILog) office from Greg Larson pics/off_luv24.tif 333x225 8-bit CIE LogLuv (SGILog24) office from " " pics/off_luv32.tif 333x225 8-bit CIE LogLuv (SGILog) office from " " pics/quad-jpeg.tif 512x384 8-bit YCbCr (jpeg) version of quad-lzw.tif pics/quad-lzw.tif 512x384 8-bit RGB (lzw) "quadric surfaces" pics/quad-tile.tif 512x384 tiled version of quad-lzw.tif (lzw) pics/strike.tif 256x200 8-bit RGBA (lzw) "bowling pins" from Pixar pics/text.tif 1512x359 4-bit b&w (thunderscan) am-express credit card pics/ycbcr-cat.tif 250x325 8-bit YCbCr (lzw) "kitty" created by rgb2ycbcr pics/smallliz.tif 160x160 8-bit YCbCr (OLD jpeg) lizard from HP** pics/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) ------------------------------------------- pics/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 pics/jim___cg.tif A Y pics/jim___dg.tif B N pics/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. .