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_posts/2024-04-03-learning-about-the-image-format.markdown
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| --- | ||
| title: Learning about the image format | ||
| --- | ||
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| The tiles are apparently stored in the [lightning strike | ||
| wavelet-compressed raster image | ||
| format](http://justsolve.archiveteam.org/wiki/Lightning_Strike). Apparently, | ||
| there exists no free software to work with such files. Here's what we found: | ||
|
|
||
| - archived [web page from the | ||
| company](https://web.archive.org/web/19970613234152/http://www.infinop.com/nhtml/lsinfo.shtml) | ||
| that developed the format | ||
| - there is a [patent describing the | ||
| approach](https://patents.google.com/patent/WO1998040842A1) | ||
| - archived [homepage of one of the | ||
| developers](https://web.archive.org/web/19990220121339/http://www.compsci.com/%7Echao/) | ||
| and [her publication | ||
| list](https://web.archive.org/web/19990220160521/http://www.compsci.com/%7Echao/Publication/); | ||
| [relevant | ||
| paper](https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=3c08d5095a328950539dd8aa13cd11c5d05063f7): | ||
| Hongyang Chao & Paul Fisher, An Approach of integer reversible | ||
| wavelet transform for Lossless image compression, in *Advances in | ||
| Computational Mathematics: Guangzhou, China -- the proceedings of | ||
| Guangzhou International Symposium on Computational Mathematics*, | ||
| Aug. 11-15, 1997, Guangzhou, P.R.China | ||
| - There existed [a browser plugin to decode such | ||
| images](ftp://ftp.sunet.se/mirror/archive/ftp.sunet.se/pub/pc/windows/winsock-indstate/Windows95/WWW-Browsers/Plug-In/). | ||
| - There also existed a [Java browser | ||
| applet](https://web.archive.org/web/19970613234343/http://www.infinop.com/nhtml/java/index.shtml) | ||
| whose classes were available (after [filling out a | ||
| form](https://web.archive.org/web/19970613235015/http://www.infinop.com/nhtml/download.shtml)), | ||
| both directly usable (e.g., | ||
| [Lightning.class](https://web.archive.org/web/19970613234343/http://www.infinop.com/nhtml/java/Lightning.class), | ||
| not archived) and as archive on a [download | ||
| page](https://web.archive.org/web/19970613234713/http://www.infinop.com/nhtml/download.shtml) | ||
| (classes.tgz, not archived). | ||
| - There seem to be [different (incompatible) | ||
| versions](https://web.archive.org/web/19970613235015/http://www.infinop.com/nhtml/javafaq.shtml): | ||
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| > /I have tried to use some .cod images from my website inside the | ||
| > Java applet, and they do not display correctly. What could be | ||
| > wrong?/ | ||
| > | ||
| > Most likely, they were compressed with an earlier version of | ||
| > Lightning Strike. The Java applet was designed for use with | ||
| > Lightning Strike 2.6 images, and for the sake of size and download | ||
| > time, was not made backward compatible. Try opening the images in | ||
| > the Lightning Strike 2.6 compressor and then resaving them in the | ||
| > new format. |