Automatic cropping for images with a flat background. Works with SixLabors.ImageSharp 2.0.0 and above.
Uses a relative luminance tolerance to determine which area to crop.
- Crops images with a flat background
- Configurable x and y padding
- Configurable treshold
Requires SixLabors.ImageSharp 2.0.0 or above
install-package ImageSharp.Web.AutoCrop
The namespace ImageSharp.Web.AutoCrop.Extensions contains some useful extensions to SixLabors.ImageSharp.Web.DependencyInjection.IImageSharpBuilder
Make sure to call the extension AddAutoCropProcessor when adding ImageSharp to services, that's all.
public void ConfigureServices(IServiceCollection services)
{
services.AddImageSharp()
.AddAutoCropProcessor();
...
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
// Configure ImageSharp.Web
app.UseImageSharp();
...
}
Check out the demo for some examples. Check out the demo project for the full source.
Requires SixLabors.ImageSharp 2.0.0 or above
install-package ImageSharp.Processing.AutoCrop
The namespace ImageSharp.Processing.AutoCrop.Extensions contains some useful extensions to SixLabors.ImageSharp.Processing.IImageProcessingContext
using var image = Image.Load("image.png");
image.Mutate(ctx => ctx.AutoCrop());
Check the different overloads for some options.
The underlying AutoCropProcessor that will handle the actual cropping takes some parameters.
| Parameter | Description | Default value |
|---|---|---|
| PadX | How much horizontal whitespace in percent (0-100) to apply outside the crop | 0 |
| PadY | How much vertical whitespace in percent (0-100) to apply outside the crop | 0 |
| PadMode | Determines if padding should be allowed to expand outside the original image (Expand or Contain) | Expand |
| ColorThreshold | Color divergence to tolerate from analyzed border color (0-255) | 35 |
| BucketThreshold | How many percent of the border that has to belong to the most present color bucket (0.0f-1.0f) | 0.945f |
