Sent: Tuesday, December 11, 2018 at 4:09 AM
From: "Alexander Ivash" <elder...@gmail.com>
To: "interestqt-project.org" <interest@qt-project.org>
Subject: Re: [Interest] QML Camera: resulting image is rotated
On Dec 11 2018, at 6:47 am, Artem Sidyakin <artem.sidya...@qt.io> wrote:
As far as I know, it is impossible to tell in which position the camera is
before you actually see its viewfinder in VideoOutput :)
In my case I had a camera upside-down, so 180 degree rotation. I managed it
like this:
property bool cameraUpsideDown: true
Camera {
id: camera
metaData.orientation: cameraUpsideDown ? 180 : 0
// ...
}
VideoOutput {
orientation: cameraUpsideDown ? 180 : 0
source: camera
// ...
}
And then if you need to preview images made by this camera you can bind their
orientation to EXIF values:
Image {
autoTransform: true
// ...
}
I think you understood correct, with a small difference: I need actual QImage
in correct orientation, not just Image capable to show it properly.
For now I temporarily gave up searching right solution and instead of using
'onImageSaved' started using 'onImageCaptured' and then stealing QImage from Qt
image cache. As I understand 'onImageCaptured' gives just a preview, but I
haven't noticed any focus issues or resolution issues or other major issues
(well, maybe there is something wrong with white balance) for preview image.
As for the metadata - I tried it before, but for some reasons
metaData.orientation was 'undefined' in my case. I need to check on different
device to be fully sure I can't trust metadata.
Regards, Alexander
The only differences are that *Captured gives you the viewfinder resolution,
not the configured image saving resolution and that *Captured happens even if
*Saved doesn't (permissions, disk space issues). Focus, etc, are all the same
for both images.
_______________________________________________
Interest mailing list
Interest@qt-project.org
https://lists.qt-project.org/listinfo/interest
