public class CIMRasterRGBColorizer : CIMRasterColorizer, System.ComponentModel.INotifyPropertyChanged, System.Xml.Serialization.IXmlSerializable  

{
    // Get the colorizer from the raster layer.
    //Note: needs to be called on the QueuedTask
    CIMRasterColorizer rColorizer = rasterLayer.GetColorizer();
    // Check if the colorizer is an RGB colorizer.
    if (rColorizer is CIMRasterRGBColorizer rasterRGBColorizer)
    {
        // Update RGB colorizer properties.
        rasterRGBColorizer.StretchType = RasterStretchType.ESRI;
        // Update the raster layer with the changed colorizer.
        rasterLayer.SetColorizer(rasterRGBColorizer);
    }
}

{
    // Get the image sub-layer from the mosaic layer.
    //Note: needs to be called on the QueuedTask
    ImageMosaicSubLayer mosaicImageSubLayer = mosaicLayer.GetImageLayer();
    // Get the colorizer from the image sub-layer.
    CIMRasterColorizer rColorizer = mosaicImageSubLayer.GetColorizer();
    // Check if the colorizer is an RGB colorizer.
    if (rColorizer is CIMRasterRGBColorizer rasterRGBColorizer)
    {
        // Update RGB colorizer properties.
        rasterRGBColorizer.StretchType = RasterStretchType.ESRI;
        // Update the image sub-layer with the changed colorizer.
        mosaicImageSubLayer.SetColorizer(rasterRGBColorizer);
    }
}

{
    // Get the colorizer from the image service layer.
    //Note: needs to be called on the QueuedTask
    CIMRasterColorizer rColorizer = imageServiceLayer.GetColorizer();
    // Check if the colorizer is an RGB colorizer.
    if (rColorizer is CIMRasterRGBColorizer rasterRGBColorizer)
    {
        // Update RGB colorizer properties.
        rasterRGBColorizer.StretchType = RasterStretchType.ESRI;
        // Update the image service layer with the changed colorizer.
        imageServiceLayer.SetColorizer((CIMRasterColorizer)rasterRGBColorizer);
    }
}