To resize images like PNG, JPEG, JPG and Co using .NET Core, there is no SDK support available today.
But the Microsoft Mono team has written a wrapper named SkiaSharp based on the Google library Skia , which works wonderfully and fast - but unfortunately a bit complex. The documentation can also be improved.
Snippet
Here is my snippet to resize images width SkiaSharp
1 public class SkiaSharpImageManipulationProvider : IImageManipulationProvider
2 {
3 public (byte[] FileContents, int Height, int Width) Resize(byte[] fileContents,
4 int maxWidth, int maxHeight,
5 SKFilterQuality quality = SKFilterQuality.Medium)
6 {
7 using MemoryStream ms = new MemoryStream(fileContents);
8 using SKBitmap sourceBitmap = SKBitmap.Decode(ms);
9
10 int height = Math.Min(maxHeight, sourceBitmap.Height);
11 int width = Math.Min(maxWidth, sourceBitmap.Width);
12
13 using SKBitmap scaledBitmap = sourceBitmap.Resize(new SKImageInfo(width, height), quality);
14 using SKImage scaledImage = SKImage.FromBitmap(scaledBitmap);
15 using SKData data = scaledImage.Encode();
16
17 return (data.ToArray(), height, width);
18 }
19 }
Author
BEN ABT
Ben is a Principal Software Engineer at Medialesson.de, with a strong focus on .NET and Microsoft Azure. In his professional role, he designs and builds highly scalable platforms for hybrid and cloud-based scenarios. He also advises companies and C-levels on migrating to the sovereign cloud.
He runs myCSharp.de, the largest and most active German-speaking C# community forum, actively contributes to both his own and external open-source projects, and regularly shares his knowledge through his blog, at community events, conferences, and as a writer for technical magazines.
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