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If you want to specify the JPEG quality, you can take a look at the following code:

ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders()
    .First(e => e.FormatID == ImageFormat.Jpeg.Guid);
EncoderParameters encoderParameters = new(1);
encoderParameters.Param[0] = new(Encoder.Quality, 90L);

using Bitmap bitmap = new(/* Width */, /* Height */);
using Graphics graphics = Graphics.FromImage(bitmap);
/* Drawing */
bitmap.Save(targetImagePath, codec, encoderParameters);

The full working example is provided below:

using System.Drawing;
using System.Drawing.Imaging;

ImageCodecInfo codec = ImageCodecInfo.GetImageEncoders()
    .First(e => e.FormatID == ImageFormat.Jpeg.Guid);
EncoderParameters encoderParameters = new(1);
encoderParameters.Param[0] = new(Encoder.Quality, 90L);

const int width = 1920;
const int height = 1080;
using Bitmap bitmap = new(width, height);
using Graphics graphics = Graphics.FromImage(bitmap);
int yMiddle = height / 2;
graphics.FillRectangle(Brushes.White, 100, 100, width - 200, yMiddle - 100);
graphics.FillRectangle(Brushes.Red, 100, yMiddle, width - 200, yMiddle - 100);
bitmap.Save("image.jpg", codec, encoderParameters);

Of course, you should not forget to install the System.Drawing.Common package from the NuGet package manager.

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