================================== 16bit840x840images test image bank ================================== Version 1.9999 (2012.06.08) 16bit840x840images is a small digital test image bank. General "flavour" of the images: 16-bit sRGB v2 Perceptual uncompressed TIFF low noise natural images with a significant area in sharp focus and low sharpening artifacts, resulting from careful downsampling to 840x840 of DSLR photographs and of one archival quality scan. The test images are: apartments.tif baby.tif boy.tif cabins.tif cat.tif curios.tif dragon.tif footbridge.tif frog.tif garland.tif horse.tif man.tif paint.tif shed.tif tower.tif wave.tif wreck.tif (Note that the curios image distributed with versions < 1.9 of the test image bank, and the apartments image distributed with versions < 1.99, were different.) Inspect the images. Don't use them blindly. The authors make no claim regarding the suitability of the test images for any purpose. Test images are in the images folder. JPEG thumbnails are in the thumbnails folder. The top level contains this README file and .txt files that detail the licensing and preparation details of the test images. All images are 840x840 16-bit sRGB (v2) uncompressed TIFF images produced with Perceptual rendering intent. 840 was chosen as width and height because it is the least common multiple (lcm) of 2, 3, 4, 5, 6, 7 and 8. Consequently, all images can be exactly box downsampled by these ratios, and enlarging back the reduced versions with the "align corners" image geometry convention using these integer ratios produces images with the original 840x840 dimensions. An sRGB v2 profile, sRGB_IEC61966-2-1_black_scaled.icc, was chosen because sRGB v2 is the most commonly used profile family. This black scaled profile, tuned for Perceptual rendering, can be downloaded from http://www.color.org/srgbprofiles.xalter. This profile is representative of recent vintage profiles used by many image processing software utilities. Perceptual rendering intent was chosen because it generally clamps less than alternatives; it is also the most commonly used. Uncompressed TIFF was chosen so that performing lots of operations on these images does not incur much decompression overhead. Except for boy.tif and wave.tif, the images were obtained by converting DSLR raw using Photivo, RawTherapee, Adobe Photoshop Lightroom, DxO+Photoshop, RawShooter Essentials or dcraw with mostly "light touch" settings, finishing off by downsampling with "exact" 2x2 or 3x3 box filtering through the XYZ colourspace or with carefully aligned Jinc-windowed Jinc 2-lobe EWA (Elliptical Weighted Averaging) through linear RGB with sRGB primaries, saving with Perceptual rendering intent with the sRGB_IEC61966-2-1_black_scaled.icc profile or with the RGB to sRGB direct converter built into ImageMagick. The boy.tif image was downsampled with "exact" 4x4 box filtering through the XYZ colourspace straight from the out of camera fine quality 8-bit JPEG (using the in-camera Nikon software). The wave.tif image, an archival colour scan, was downsampled with "exact" 5x5 box filtering through the XYZ colourspace. Processing details are found in the .txt files (baby.txt for baby.tif etc). Note that processing details may not be perfectly accurate, and that the various toolchains are not flawless w.r.t. colour fidelity. ---------------------------------------------------------------------- Authors: Nicolas Robidoux, Jean-François Avon, Anthony Barnett, John Cupitt, Jana Duncan, Minglun Gong, Holly Graham, Henry HO, Kirk Martinez, Michael Muré, Mukund Sivaraman, Adam Turcotte and Luiz E. Vasconcellos. ---------------------------------------------------------------------- Licensing: Summary: CC-by Particulars: The raw images and the one scan from which the final tif images were made have various licenses, assigned by their respective authors, described in the corresponding .txt file: CC-0, Public domain and/or CC-by. In some cases, the original author also performed the processing from raw, as indicated. Specifically: The raw image from which apartments.tif was made, authored by Henry HO, is CC-0 (Public domain). The raw image from which baby.tif was made, authored by Minglun Gong, is dual Public domain and CC-by. The original raw and the (full-size) JPEG image from which boy.tif was made, authored by John Cupitt, are CC-0 (Public domain). The original raw and the (full-size) TIFF image from which cabins.tif was made, authored by Anthony Barnett, are CC-by. The original raw and the (full-size) TIFF image from which cat.tif was made, authored by Luiz E. Vasconcellos, are CC-by. The original raw and the (full-size) TIFF image from which curios.tif was made, authored by Jean-François Avon, are Public domain. The raw image from which dragon.tif was made, authored by Michael Muré, is CC-0 (Public domain). The raw image from which footbridge.tif was made, authored by Jana Duncan, is CC-by. The original raw and the (full-size) TIFF image from which frog.tif was made, authored by Luiz E. Vasconcellos, are CC-by. The raw image from which garland.tif was made, authored by Mukund Sivaraman, is CC-0 (Public domain). The raw image from which horse.tif was made, authored by Kirk Martinez, is CC-0 (Public domain). The raw image from which man.tif was made, authored by Holly Graham, is CC-0 (Public domain). The original raw and the (full-size) TIFF image from which paint.tif was made, authored by Anthony Barnett, is CC-by. The raw image from which shed.tif was made, authored by Jana Duncan, is CC-by. The raw image from which tower.tif was made, authored by Jana Duncan, is CC-by. The original scan of a reproduction by an anonymous engraver of artwork by Hokusai Katsushika, from which wave.tif was made, is Public domain (there are no known restrictions on publication according to the Library of Congress). The original raw and the (full-size) TIFF image from which wreck.tif was made, authored by Anthony Barnett, are CC-by. ----- The final versions of the images were produced by Nicolas Robidoux and Adam Turcotte who hereby release their contributions to the final images and this test image bank under the following license: Summary licensing for Nicolas Robidoux and Adam Turcotte's processing, packaging and documentation of the images: CC-0 (Public domain) To the extent possible under law, Nicolas Robidoux and Adam Turcotte have waived all copyright and related or neighboring rights w.r.t. their contributions to the images distributed within the 840x840images test image bank, as well as the bank itself. This work is published from: Canada. ---------------------------------------------------------------------- Please cite this test image bank @Misc{16bit840x840images, author = {Nicolas Robidoux and Jean-Fran\c{c}ois Avon and Anthony Barnett and John Cupitt and Jana Duncan and Minglun Gong and Holly Graham and Henry {H}{O} and Kirk Martinez and Michael Mur\'{e} and Mukund Sivaraman and Adam Turcotte and Luiz E. Vasconcellos}, title = {16bit840x840images test image bank}, howpublished = {\url{http://www.imagemagick.org/download/image-bank}}, month = {May}, year = {2012}} and Adam Turcotte's Masters thesis EXQUIRES (Evaluative and eXtensible QUantitative Image Re-Enlargement Suite) implementation and comparison of resizing methods and difference metrics . Special thanks to Cristy, the lead developer of ImageMagick, for hosting this test image bank. ---------------------------------------------------------------------- Address criticism/suggestions/comments/praise to Nicolas Robidoux or post them at the ImageMagick Forum, for example at http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20691 or http://www.imagemagick.org/discourse-server/viewforum.php?f=19.