support auto_rotate

[jcupitt]

See libvips/ruby-vips#53

vipsthumbnail now has an autorotate feature, it might be possible to use part of that for ideas.

https://github.com/jcupitt/libvips/blob/master/tools/vipsthumbnail.c#L138

[arkmediastudio]

@eltiare sorry to ping you directly, Is it possible for us to get this feature added?.

Thank You.

[eltiare]

No worries, I've been a bit busy with work and taking care of a sick wife. I'll get this here fairly soon.

[arkmediastudio]

No problem, i will wait. Thank you for making this gem. 👍

[arkmediastudio]

I am still waiting for this . Can you please see lovell/sharp@a94dd2b if that helps to implement the feature in carrierwave-vips.

Thank You

[eltiare]

I'm running into problems reading the EXIF data. I've added comments on libvips/ruby-vips#53

[eltiare]

Thanks to @jcupitt I got the issue resolved. Can you please test to make sure that it works properly for you? Be sure to use the code in the master branch on Github as I've not yet pushed the changes to RubyGems.

[jcupitt]

I looked over the code and it seems reasonable, but I don't have a good carrierwave test setup so I didn't actually test it. Someone with a nice set of test images should try it and report.

[arkmediastudio]

hi @eltiare i have tested it but couldn't get this working. i am testing this using https://github.com/eltiare/carrierwave-vips/blob/master/spec/fixtures/portrait-with-orientation.jpg image, no errors are shown but it doesn't orient correctly in img tag in html. when i goto version directory using file browser i can see it orient correctly and when i open image using image viewer it shows correctly. but when put inside a img tag the orientation is wrong. how can i help you to debug this issue?. i am using github master branch of the this gem and ruby vips version is 0.3.9 and i am on ubuntu 14.04

[arkmediastudio]

why we remove orientation metadata in auto_orient in #L69 ?. i also tried without removing it and also setting it to 1 but nothing works