Zerochan.net is one of famous anime/game/CG imageboards with strong community and modest crossposting with other imageboards. It has specific tagging system - close to e-shuushuu-net - but not to mainstream danbooru / safebooru / yande-re / konachan / sankaku. That's why Zerochan is a good distinct source for investigation of non-photographic images and their metadata. This release devoted to paleonthologic part of board **from very start till 31.12.2014 (ID=1820227)** right before [2015-2016 release](https://nyaa.si/view/1313832) The enormous volume of initial images (~650 GB) brought within reasonable limit with **selective sampling** described below. #### Release contains: - **313.044 JPG images in 183 zipped folders** partitioned by 10.000-th ID * filtered by initial size ~ least(image_height,image_width)>=1080 -- fullHD wallpapers as minimum ~ image_height*image_width>=1200000 -- 1100x1100 included ~ image_width/image_height between 0.32 and 3.2 -- not too disproportional * renamed **"zerochan - id - up_to_3_sources ~ up_to_5_characters (up_to_2_artists).ext"** ~ tags concatenated via "+", spaces replaced with underscores ~ maximum file name length 220 symbols, characters tags may be truncated if too long * some gentle deduplication made - metadata for every image **ZERO_POSTS_2014.TSV** in root folder **313.036 rows** * from imageboard (original file URL, upload date) * image info (size, volume, md5 etc) both for original and sample - tag info for Copyright / Characters / Artists and more **ZERO_TAGS_2014.TSV** with 1.815.947 rows * as parsed from site with Unicode suppressed / replaced * many of them used in file naming but there are a lot of more #### About sampling: Huge total size of initial images leads to unpractical torrent release - too big and not too worthy to be supportible. I desided to selectively shrink big / bloated images to practical size with good quality, that was chosen as **1920 px longer side (Full HD both landscape and portrait) and JPEG quality 92%** I used **image magick mogrify -thumbnail 1920x1920^> -quality 92 -format jpg** and then compare initial and sampled image to left initial image when negative or minor effect of resampling. There are **90.375 original images** left in release, as pointed out in IMG_TYPE column of ZERO_POSTS. [THERE ARE](https://sukebei.nyaa.si/user/AlexPUA) some - also sampled - rips on Sukebei tracker for Konachan and Yande-re. With nipples.