how to change to Microsoft.ML.OnnxRuntime.Tensors.DenseTensor<float>?

[BingGitCn]

public static void ExtractPixelsArgb(DenseTensor tensor, Span data, int pixelCount)
{
Span spanR = tensor.Buffer.Span;
Span spanG = spanR[pixelCount..];
Span spanB = spanG[pixelCount..];

 int sidx = 0;
 for (int i = 0; i < pixelCount; i++)
 {
     spanR[i] = data[sidx + 2] * 0.0039215686274509803921568627451f;
     spanG[i] = data[sidx + 1] * 0.0039215686274509803921568627451f;
     spanB[i] = data[sidx] * 0.0039215686274509803921568627451f;
     sidx += 4;
 }

}
Is there a faster way than this?