Libvips: `auto_rotate` doesn't work as expected. Processed image is wrongly rotated.

[gencer]

I am trying to process an image taken by specifically S9+. Image looks normal on Windows. I transfer that image to Linux (Debian) and process via ruby. Output is always 90-degree rotated. It should rotate correctly same as input. :autorotate key didn't help.

Sample Image: 20190519_225024.zip

_Sample has vertically usb stick. Output is always horizontally._

Please also see our discussion here: https://github.com/janko/image_processing/issues/52

However, I ran the same script on Windows with libvips 8.6.4, output is correct. I get correct rotation. Same as input.

I also did one last test. Ran the script in Linux then copy output file to windows and I see that they are rotated wrongly.

Linux server has libvips 8.7.4. Also installed 8.8.0-rc3 recently. Both has the same behavior.

Also, @janko confirms that it works on Mac too.

What might be the problem?

_I was woking on Golang previously, when i upload and process such images (like the attached one) i always get the correct result with :autorotate. But not this time on ruby_

Script:

require "vips"

file_path = "./20190518_094223.jpeg"

Vips::Image
  .new_from_file(file_path, autorotate: true)
  .write_to_file("autorotated_1.png")

Vips::Image
  .new_from_file(file_path)
  .autorot
  .write_to_file("autorotated_2.png")

Vips::Image
  .jpegload(file_path, autorotate: true)
  .write_to_file("autorotated_3.png")

Vips::Image
  .thumbnail(file_path, size, height: size)
  .write_to_file("autorotated_4.png")

Vips::Image
  .thumbnail(file_path, size, height: size, auto_rotate: true)
  .write_to_file("autorotated_5.png")

Update:

I open that image with mspaint, draw a line randomly. Saved it. Then processed with above script and output is correct. This is really weird.

[jcupitt]

Hello @gencer,

Just a guess, but could your libvips on Debian have been built without libexif?

Without exif support, libvips will unable to see the orientation tag on the image and will not rotate it.

[jcupitt]

To test, try reading the orientation tag at the command-line, eg.

$ vipsheader -f orientation ~/pics/Portrait_6.jpg 
6

[gencer]

Since I see your answer, i can't stop laughing to myself. How did I missed that!

Yes, libexif-dev is not installed on the machine...

Issue resolved by rebuilding with libexif-dev.

(Seriously, 😒 how did i missed that)

Thank you!

[jcupitt]

Glad it's working now!