NEF image file - ping() return format as Tiff

[chengvue]

Hello! I'm using Magick.NET-Q16-AnyCPU v14.10.0 to identify image formats. For NEF (.nef) files, Ping() is returning Tiff instead of Nef. When I use ImageMagick via cmd identify, it returns Nef as expected. Does Magick.NET supports NEF? I've attached an example NEF image.

Tried other formats (tif, jpg, png, heic, etc) and Ping() works fine. Somehow, it's just not reading NEF correctly.
NEF.zip

Thanks,
Cheng

[dlemstra]

Can you provide me with a code sample? How are you reading this file?

[chengvue]

I'm reading the file from a multipart POST. Code example:
var inputFile = Request.Form.Files.FirstOrDefault(); var inputImageStream = inputFile .OpenReadStream(); var imgMagic = new MagickImage(); imgMagic.Ping(inputImageStream); var format = imgMagic.Format;

[dlemstra]

The issue here is that you are reading it from a stream instead of a file. When ImageMagick reads the file on the command line it also uses the extensions to determine the format of the image. And that is why it works on the command line but not with a stream. You will need to specify the extension here.

[chengvue]

I'm trying to limit images based on our allowed formats. I started with file extension but that's not reliable. A user can rename a txt file to jpg and upload. Another example, they can rename from an unsupported format to supported format. I want something that can verify it's an image and identify the actual format instead of relying on file extension.