XbrzSharp 1.0.0

XbrzSharp

xBRZ: "Scale by rules" – high quality image upscaling filter by Zenju.

This is a .NET 8 port of xBRZ 1.8, based on the Java port by Stanio.

Important: This project is distinct from another .NET port xBRZ.NET (namespace xBRZNet).

Right ow it's a very straightforward port. Performance optimizations and more idiomatic .NET code may be added in the future.

Copyright (c) 2025 Ho Tzin Mein

Projects

• XbrzSharp – Core xBRZ upscaling logic (library)
• XbrzSharpTool – Command-line tool for batch image upscaling

Usage

Command-Line Tool

dotnet run --project XbrzSharpTool -- <source> [scaling_factor]

• <source>: Path to the input image file or directory. If a directory is specified, all supported images in the directory will be upscaled.
• [scaling_factor]: Optional integer (default: 2). Must be between 2 and 6.

The output will be saved as <source-image>@<factor>x.png in the same directory as the input file(s).

Library API Example

You can use the XbrzSharp library in your own .NET projects for programmatic upscaling:

using System.Drawing;
using System.Drawing.Imaging;
using Xbrz;

// Load your image as a Bitmap
using var bitmap = new Bitmap("input.png");

// Convert to ARGB int[] array
int width = bitmap.Width, height = bitmap.Height;
int[] srcPixels = new int[width * height];
var rect = new Rectangle(0, 0, width, height);
var data = bitmap.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
System.Runtime.InteropServices.Marshal.Copy(data.Scan0, srcPixels, 0, srcPixels.Length);
bitmap.UnlockBits(data);

// Perform scaling
int factor = 3;
var scaler = new XbrzScaler(factor, withAlpha: true);
int[] scaledPixels = scaler.ScaleImage(srcPixels, null, width, height);

// Convert back to Bitmap
int scaledWidth = width * factor, scaledHeight = height * factor;
var scaledBitmap = new Bitmap(scaledWidth, scaledHeight, PixelFormat.Format32bppArgb);
var scaledRect = new Rectangle(0, 0, scaledWidth, scaledHeight);
var scaledData = scaledBitmap.LockBits(scaledRect, ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
System.Runtime.InteropServices.Marshal.Copy(scaledPixels, 0, scaledData.Scan0, scaledPixels.Length);
scaledBitmap.UnlockBits(scaledData);

// Save the result
scaledBitmap.Save("output@3x.png");

Attribution for Test Assets

Test inputs and expected outputs are copied from the xBRZ Java port by Stanio:

Java port repository: https://github.com/stanio/xbzr-java

License

• Core library (xBrzNet): GNU General Public License v3.0
• Other code (tools, tests, helpers, documentation): BSD Zero Clause License

See LICENSE for full license texts.