Support GIF files - Githubissues

jokiazhang / metadata-extractor

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Support GIF files #64

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago

http://en.wikipedia.org/wiki/Graphics_Interchange_Format

http://www.prepressure.com/library/file-formats/gif

http://www.fileformat.info/format/gif/egff.htm

IMPORTANT NOTE

I need to consider whether it's viable to implement support for GIF files, 
given that the Unisys believes the LZW algorithm to be proprietary. Some say 
that only GIF encoders require license fees be paid, but this still requires 
some analysis. If you have any experience in this field, please comment on this 
issue. Thank you.

Original issue reported on code.google.com by drewnoakes on 29 Oct 2012 at 3:59

GoogleCodeExporter commented 8 years ago

Further analysis of the Unisys's claimed patent with regards to GIF indicates 
that it applies to the LZW algorithm used to encode the image data. Extracting 
data from the header of GIF files does not fall under that patent.

Original comment by drewnoakes on 31 Dec 2012 at 3:41

Changed state: Started

GoogleCodeExporter commented 8 years ago

This has been implemented and will be included in 2.7.0.

Image dimensions, colour depth, as well as palette size is included.

See commit 897708fdac9e3fd956622ce5b6abbc3c2fd665bc for details.

Original comment by drewnoakes on 31 Dec 2012 at 5:10

Changed state: Fixed

GoogleCodeExporter commented 8 years ago

Testing whether it's possible to link to revisions from comments:

r897708fdac9e3fd956622ce5b6abbc3c2fd665bc

Original comment by drewnoakes on 31 Dec 2012 at 5:11