UnknownImageFormatException for 'some' jpg files

[China-MYJSY]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

ImageSharp version

3.1.11

Other ImageSharp packages and versions

none

Environment (Operating system, version and so on)

window11 x64

.NET Framework version

.net9

Description

When trying to load a local .jpg file, the following error occurs:

SixLabors.ImageSharp.UnknownImageFormatException:“Image cannot be loaded. Available decoders:
 - PBM : PbmDecoder
 - PNG : PngDecoder
 - GIF : GifDecoder
 - BMP : BmpDecoder
 - TGA : TgaDecoder
 - JPEG : JpegDecoder
 - TIFF : TiffDecoder
 - Webp : WebpDecoder
 - QOI : QoiDecoder
”

    SixLabors.ImageSharp.Formats.ImageFormatManager.ThrowInvalidDecoder(SixLabors.ImageSharp.Formats.ImageFormatManager)
    SixLabors.ImageSharp.Image.InternalDetectFormat(SixLabors.ImageSharp.Configuration, System.IO.Stream)
    SixLabors.ImageSharp.Image.DiscoverDecoder(SixLabors.ImageSharp.Formats.DecoderOptions, System.IO.Stream)
    SixLabors.ImageSharp.Image.Decode(SixLabors.ImageSharp.Formats.DecoderOptions, System.IO.Stream)
    SixLabors.ImageSharp.Image.Load.AnonymousMethod__0(System.IO.Stream)
    SixLabors.ImageSharp.Image.WithSeekableStream<T>(SixLabors.ImageSharp.Formats.DecoderOptions, System.IO.Stream, System.Func<System.IO.Stream, T>)
    SixLabors.ImageSharp.Image.Load(SixLabors.ImageSharp.Formats.DecoderOptions, System.IO.Stream)
    SixLabors.ImageSharp.Image.Load(SixLabors.ImageSharp.Formats.DecoderOptions, string)
    SixLabors.ImageSharp.Image.Load(string)

Steps to Reproduce

using var image1 = SixLabors.ImageSharp.Image.Load("c90b4985f3b2db100e1f287ded9cfb8c9439513d.jpg");

Images

I put the image inside a ZIP archive.

c90b4985f3b2db100e1f287ded9cfb8c9439513d.zip

[JimBobSquarePants]

It's not a JPEG it's AVIF.

For relevant WIP PR and discussion regarding support please see #2633

[China-MYJSY]

It's not a JPEG it's AVIF.

For relevant WIP PR and discussion regarding support please see #2633

My apologies for the confusion. I used an online tool to check the file and mistakenly thought it was a JPEG. I'm looking forward to the day a version with support for HEIF images is released!

[JimBobSquarePants]

No problem. I would always rely on a HEX editor over an online tool where possible.

The one I used to analyze the image is from here: https://github.com/WerWolv/ImHex