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.NET: Access the Pixels of an Image Using SixLabors.ImageSharp v3.0

It may be necessary to access the color information of as image, such as preparing data for a convolutional neural network.

See how to crop an image to a square.

using SixLabors.ImageSharp;
var inputs = new double[28 * 28];
using (var bmp = Image.Load<Rgb24>("file.jpg"))
{
	if (bmp.Width != 28 && bmp.Height != 28)
		bmp.Mutate(x => x.Resize(28, 28));
	bmp.ProcessPixelRows(accessor =>
	{
		for (int y = 0; y < 28; y++)
		{
			Span pixelRow = accessor.GetRowSpan(y);
			for (int x = 0; x < 28; x++)
			{
				ref Rgb24 pixel = ref pixelRow[x];
				inputs[y * 28 + x] = 1 - (pixel.R + pixel.G + pixel.B) / 3 / 255.0;
			}
		}
	});
}

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