Hello,

The C# code at

https://www.atalasoft.com/products/dotimage/docs/AccessingPixelData.html

has an error.

The correct code would be this:

PixelMemory pm = image.PixelMemory;
using (PixelAccessor pa = pm.AcquirePixelAccessor())
{
    for (int y=0; y < image.Height; y++)
    {
        byte[] row = pa.AcquireScanline(y);
        for (int i=0; i < row.Length; i++)
        { 

            /// YOU NEED A CAST HERE 

            row[i] = (byte)  row[i] / 2; // dim each byte value by 50%

        }
        pa.ReleaseScanline();
    }
}