CODEWITHSUNDEEP
asp.net-core-2.0system.drawingresize-image
Rana Mujahid
Rana Mujahid

Reputation: 246

How to resize image after being uploaded in ASP.NET Core 2.0

I want to resize an image and save this image multiple times with different sizes into a folder. I have tried ImageResizer or CoreCompat.System.Drawing but these libraries not compatible with .Net core 2. I have searched a lot of about this but i can't find any proper solution. like in MVC4 i have used as:

public ActionResult Upload(HttpPostedFileBase file)
{
if (file != null)
{
    var versions = new Dictionary<string, string>();

    var path = Server.MapPath("~/Images/");

    //Define the versions to generate
    versions.Add("_small", "maxwidth=600&maxheight=600&format=jpg";);
    versions.Add("_medium", "maxwidth=900&maxheight=900&format=jpg");
    versions.Add("_large", "maxwidth=1200&maxheight=1200&format=jpg");

    //Generate each version
    foreach (var suffix in versions.Keys)
    {
        file.InputStream.Seek(0, SeekOrigin.Begin);

        //Let the image builder add the correct extension based on the output file type
        ImageBuilder.Current.Build(
            new ImageJob(
                file.InputStream,
                path + file.FileName + suffix,
                new Instructions(versions[suffix]),
                false,
                true));
    }
}

return RedirectToAction("Index");
}

but in Asp.Net core 2.0 i am stuck. i have no idea how can i implement this in .Net core 2. Any one please can help me.

Upvotes: 15

Views: 18725

Answers (4)

Lilith River
Lilith River

Reputation: 16468

Imageflow.NET Server is the .NET Core equivalent to ImageResizer, but is much faster and produces much smaller image files. See https://github.com/imazen/imageflow-dotnet-server

If you are just resizing during upload, or want to write your own middleware, use Imageflow.NET directly. See https://github.com/imazen/imageflow-dotnet

[Disclaimer: I am the author of both ImageResizer and Imageflow]

Upvotes: 0

valentasm
valentasm

Reputation: 2382

You could get nuget package SixLabors.ImageSharp (do not forget to tick "Include prereleases" since now they have only beta) and use they library like this. Their GitHub

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

// Image.Load(string path) is a shortcut for our default type. 
// Other pixel formats use Image.Load<TPixel>(string path))
using (Image<Rgba32> image = Image.Load("foo.jpg"))
{
    image.Mutate(x => x
         .Resize(image.Width / 2, image.Height / 2)
         .Grayscale());
    image.Save("bar.jpg"); // Automatic encoder selected based on extension.
}

Upvotes: 6

Frederik Carlier
Frederik Carlier

Reputation: 4776

.NET Core 2.0 ships with System.Drawing.Common, which is the official implementation of System.Drawing for .NET Core.

Instead of CoreCompat.System.Drawing, can you try to install System.Drawing.Common and check whether that works?

Upvotes: 8

james
james

Reputation: 743

Image processing in .NET Core : https://blogs.msdn.microsoft.com/dotnet/2017/01/19/net-core-image-processing/

Upvotes: 0

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