Pre-Process Image (Brightness, Contrast, Greyscale)

**Pre-Process Image (Brightness, Contrast, Greyscale)**

I am working on a project which will detect custom shapes

Code Snippet below
ObjectDetection.ModelInput modelInput = new ObjectDetection.ModelInput
{
Image = MLImage.CreateFromFile(selectedFilePath) // selectedFilePath is the image file path
};
var modelOutput = ObjectDetection.Predict(modelInput);

I want to preprocess the image and feed it to the input model.
**Preprocess means adjusting Brightness, Contrast or Greyscale**

so how do we convert System.Drawing.Image to MLImage

simple workflow
Capture Image -> Adjust Brightness, Contrast -> Feed the image to input image -> We get prediction boxes -> Process the Box area