Detect picture format with SixLabors ImageSharp

Question

How do I get the image format using SixLabors.ImageSharp?

In version 1.0.0-alpha9-00152 I could use:

Image<Rgba32> image = Image.Load(GetBytesFromBlobStorage());
IImageFormat format = image.CurrentImageFormat;

but .CurrentImageFormat() doesn't seen to be able in beta version 1.0.0-beta0001.

I want to know if the image is .png, .bmp or .jpeg.

score 21 · Accepted Answer · answered Oct 18 '17 at 10:16

21

Yeah, we moved your cheese a little bit with 1.0.0-beta0001.

The signature you are looking for is now.

public static Image<TPixel> Load<TPixel>(Stream stream, out IImageFormat format)

answered Oct 18 '17 at 10:16

James South

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Will there be a way to check the image format after the image has been loaded? Like the CurrentImageFormat. – Riza Marhaban Oct 28 '19 at 01:36
That `IIMageFormat` out parameter gives you exactly that. – James South Nov 06 '19 at 02:53
@JamesSouth It is not available **after** the image has been loaded (when you have only one variable - Image) – RouR Apr 01 '20 at 19:41
@RouR I don't understand what you mean. – James South Apr 01 '20 at 21:42
Apparently, this was changed after the 1.0.0 release. @JamesSouth what is the way to do the same right now? – Illia Ratkevych Nov 12 '20 at 17:47
Nope here it is. https://docs.sixlabors.com/api/ImageSharp/SixLabors.ImageSharp.Image.html#SixLabors_ImageSharp_Image_Load__1_System_IO_Stream_SixLabors_ImageSharp_Formats_IImageFormat__ – James South Nov 12 '20 at 23:44
You are right, sync Load() does have an "out" argument. I missed that I'm using LoadAsync which does not seems to have it. – Illia Ratkevych Nov 13 '20 at 09:22
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Async methods cannot have out parameters. You need `LoadWithFormatAsync` https://docs.sixlabors.com/api/ImageSharp/SixLabors.ImageSharp.Image.html#SixLabors_ImageSharp_Image_LoadWithFormatAsync_System_IO_Stream_ – James South Nov 13 '20 at 15:15
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Exactly what I need! Thank you @JamesSouth – Illia Ratkevych Nov 16 '20 at 15:57
No worries, happy to help – James South Nov 16 '20 at 22:32
I currently use the 2.1.0 version. From what I've seen so far I have to keep the IImageFormat in a variable while loading the image. It seems there is no way to detect what the format is, just having an Image variable. Is that correct? – Teo Bebekis Mar 19 '22 at 14:23
Use Identify. There’s API docs btw – James South Mar 21 '22 at 14:40

score 2 · Answer 2 · answered Oct 24 '22 at 06:06

2

If you only need to detect format without loading the whole image there is a method DetectFormatAsync:

public static Task<IImageFormat> DetectFormatAsync(Stream stream, CancellationToken cancellationToken = default)

answered Oct 24 '22 at 06:06

Yuriy Gavrishov

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Detect picture format with SixLabors ImageSharp

2 Answers2

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