implement exif mirror orientations

[ZanonEdoardo]

Hi,

In Image.new_from_file doesn't work in some cases. In the following image, it works correctly (simple rotation), with a mirrored image it doesn't work.

image = pyvips.Image.new_from_file(path, access='random', memory=False, autorotate=True, **kwargs)`

The image left,right and down works, the other not.

What am I doing wrong? Thanks a lot for your help.

[jcupitt]

Hello, libvips only supports the rotation orientations, not the mirror ones.

I don't know of any real devices that use the mirror codes -- they only appear in test suites.

[ZanonEdoardo]

Hello, libvips only supports the rotation orientations, not the mirror ones.

I don't know of any real devices that use the mirror codes -- they only appear in test suites.

Hi, Thanks for your answer. The webcam photos can produce mirrored images. Can be this feature supported in libvips - pyvips in the future?

In the front cam of Samsung s10, I can generate an image mirrored. (reflection)

[jcupitt]

Oh, interesting, I didn't know they were really used.

Sure, let's tag this issue as an enhancement. Do you have a sample image?

[yunixon]

Sample images: https://github.com/recurser/exif-orientation-examples

[ZanonEdoardo]

Thanks @yunixon, i've forgot to add the images!