No, sorry, that image really is width 4032 and height 2268.
You see, cameras always produce the same resolution image. If it's a 4032x2268
sensor, it will make a 4032x2268 image no matter how you are holding the
camera. The camera has an orientation sensor, and that is used to set the
Orientation metadata in the saved image file, to reflect how to display the
image so that it will match the way you were holding the camera. That's a lot
simpler and cheaper than actually rotating the image pixels.
The picture was taken with an iPhone, so I'll presume that you have a good
chance of having a Mac. Open your image with Preview.app. You'll see that it
appears oriented correctly, but if you hit Cmd-I (for info), and select the
"General" tab, and you'll see that it says the height is 2268 and width is 4032
and will tell you the orientation is 6 (meaning it should be rotated 90 degrees
clockwise when displayed).
With the OpenImageIO API, you can retrieve the "Orientation" metadata like this:
int orientation = spec.get_int_attribute("Orientation");
It's really the responsibility of the display program to draw it with the
hinted orientation.
Though if you wish to actually transform it into a 4032x2268 using OpenImageIO
calls, you can
ImageBuf rotated = ImageBufAlgo::reorient(inp);
This will apply whatever Orientation is in inp's metadata by actually rotating
the image (and in the resulting image, the Orientation metadata will be 0,
meaning that it should be displayed with the (0,0) pixel in the upper left
corner).
> On Dec 28, 2022, at 11:36 PM, 0ices <zeroi...@qq.com> wrote:
>
> The width of this image is 2268 and the height is 4032, but the width
> obtained through oiio is 4032 and the height is 2268.
> here is my code, how can I get the right result
>
> ImageBuf inp(input_path, 【cache】);
> const ImageSpec& spec = inp.spec();
> const int nch = spec.nchannels;
> const int width = spec.width;
> const int height = spec.height;
> <IMG_1559.JPG>_______________________________________________
> Oiio-dev mailing list
> Oiio-dev@lists.openimageio.org
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--
Larry Gritz
l...@larrygritz.com
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