Get Image dimensions in c# asp.net core (framework 4.6.1)

Question

Any idea on how to get an image dimensions in asp.net core, knowing that System.Drawing.Image doesn't work on this version. This is how I am actually reading the image:

byte[] data = File.ReadAllBytes("path_to_image");
return data;

i.e.: Can I find the Height and Width of an image in its byte[] representaion?

Any help in how to rotate the image is also welcome.

I think this may answer your question: Getting image dimensions without reading the entire file — Ashkan Mobayen Khiabani
– Ashkan Mobayen Khiabani, Commented Jul 7, 2016 at 15:26
It depends on the type of image. What kind of images are you reading? — Jean-François Beauchamp
– Jean-François Beauchamp, Commented Jul 7, 2016 at 15:27
any type of image (jpeg, png, etc.) @Jean-François Beauchamp — Jean AR
– Jean AR, Commented Jul 7, 2016 at 15:29

Zachary Way · Accepted Answer · 2016-07-07 15:25:01Z

1

You want bytes 11-12 for Horizontal resolution, and 13-14 for Vertical resolution. Assuming you're talking about a JPEG image. And byte 10 gives you the unit type (dots per inch or dots per cm)

https://www.w3.org/Graphics/JPEG/jfif3.pdf

answered Jul 7, 2016 at 15:25

Zachary Way

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