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Re: [GMG-Devel] Raw image [NEF, CR2] support in MediaGoblin (issue #888)

From: Christopher Allan Webber
Subject: Re: [GMG-Devel] Raw image [NEF, CR2] support in MediaGoblin (issue #888)
Date: Mon, 02 Jun 2014 09:44:45 -0500
User-agent: mu4e; emacs 24.3.1

Sounds useful, probably important.  I would be down with having this
plugin included in MediaGoblin, if it is well written.

address@hidden writes:

> Hello good folk,
> since early in mediagoblin days I've been having a hacked version that
> could handle raw files, which a big chunk of my media library is stored as.
> I'd really like to upstream this plugin. Have it directly in media_types/
> like the STL plugin and other things that are not enabled by default.
> There's basically two main ways to deal with raw images.
> 1) Process them using a helper tool like dcraw.
> 2) Extract the full-size JPEG 'previews' embedded within the EXIF info of
> the file.
> Method 1 is excruciating slow, and very CPU intensive. Method 2, on the
> other hand, is almost instant. Not surprising.
> I don't think *every* raw image file format has such a JPEG embedded, but
> based on my own usage, I'd guess the most popular cameras would. I can at
> least find them in the two camera brands that probably has the most raw
> pictures taken during any day; Nikon's NEF files, Canon's CR2 files.
> My plugin implements method 2 using the excellent exiv2 library for
> extracting the JPEG previews. EXIF-py which we distribute with MediaGoblin
> does not support it. Having an external dependency is not unlike other
> media_type plugins currently shipped with MediaGoblin.
> So can we make raw images in MediaGoblin happen?

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