File format of CF10-jpg

Question

While working on a tool that allows to exchange images of several third-party applications and thus creating individual "skins" for those applications, I have stumbled across a jpg-format about which I cannot seem to find any decent informations.

When looking at it in a hex-editor, it starts with the tag "CF10". Searching the internet has only provided a tool that is able to handle these kind of files, without any additional informations.

Does anyone have any further informations about this type of jpg-format?

Answer 1

CF stands for "Compression Factor". CF-10 means factor ten, and I don't think it's different from any "standard" jpeg.

Answer 2

I'm also looking for informations about this format. Anyone know something?

Answer 3

file(1) should give you some useful information. You can also use ImageMagick's identify(1) program (optionally with the -verbose option) to get even more details about the file. See the example on that page for a good idea of what information it provides.

Answer 4

You could also try and see what the Droid identification tool says about that file.

Answer 5

DROID gives it as being a "JTIP (JPEG Tiled Image Pyramid)". Some info from http://www.bcr.org/cdp/digitaltb/digital_imaging/formats.html :

JTIP (JPEG Tiled Image Pyramid) is similar to GridPrix. It offers multiple layers of higher and higher resolutions. Each layer is further divided into tiles. A user can zoom into these tiles, or request a corresponding tile at a higher resolution.