23510 2013-10-14 21:34:56 +0000 <canvas>: Allow EXIF data to be passed to toBlob() 2017-07-21 10:29:17 +0000 1 1 1 Unclassified WHATWG HTML unspecified Other All RESOLVED WONTFIX P3 enhancement Needs Impl Interest 1 ian ian adrianba annevk hober0 ian jackalmage james mike zcorpan contributor oldest_to_newest 94714 0 ian 2013-10-14 21:34:56 +0000 On Fri, 7 Jun 2013, David Flanagan wrote: > > I would like to propose the addition of a fourth argument [for > toBlob()] (for the JPEG case only) that would specify EXIF metadata > to be included in the JPEG blob. (I have not tried yet, but I'm > assuming that we could define some suitable JSON serialization > format for EXIF data. If not, then even allowing a binary blob of > EXIF data as the fourth argument would be helpful.) > > The use case for this feature is image editing applications, like > the Gallery app on FirefoxOS devices. Whenever that app crops or > edits a photo it encodes the edited photo with Canvas.toBlob(), and > the process strips all metadata from the photo. Reading EXIF data > from a JPEG blob is relatively straightforward can can be done with > JavaScript, but inserting EXIF data into an existing blob is much > harder: this is a task that is best done when the JPEG blob is being > created, which means that it is a feature that belongs in toBlob and > can not be done efficiently with an external library. On Fri, 7 Jun 2013, Jonas Sicking wrote: > > If someone goes through the work of defining an EXIF <-> JSON mapping > then this is something I'd be interested to see added to the spec. > > It definitely would be nice to enable modifying EXIF metadata without > having to re-encode the pixel data since that leads to loss of > quality. On Wed, 12 Jun 2013, Alexandre Morgaut wrote: > > We have a JS API for that in Wakanda > http://doc.wakanda.org/Images/Image-Class/meta.303-660131.en.html > > It use the saveMeta() meta method to apply potential changes: > http://doc.wakanda.org/Images/Image-Class/saveMeta.301-661057.en.html 109193 1 ian 2014-07-23 00:05:57 +0000 Any interest from vendors other than Mozilla? 128737 2 annevk 2017-07-21 10:29:17 +0000 If there's still interest in this, please file an issue at https://github.com/whatwg/html/issues/new.