Tag: image

Cybook t4b Format Specification



The new epub thumbnail files (.epub.thn) are what Bookeen calls t4b files. They are very similar to the older t2b thumbnail files they were using in earlier versions of the Cybook firmware. As the name suggests instead of using 2 bits to represent color values 4 bits are now... Continue reading

Cybook 2.0 Thumbnail Observations



The 2.0 fimware for the Cybook and Opus have new thumbnails for epub files. They use the .thn extension and it is append after the .epub extension. This is unlike the _6090.t2b thumbnails which use the book name without the extension and _6090.t2b appended to it. I have... Continue reading

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