QrCoder Asp.Net - How to remove noise? - asp.net

Question

Right now I'm creating my QR-Code using QrCoder from Asp.Net. You can see my code below:
SvgQrCode:
public void UpdateText(string value)
{
using (var qrGenerator = new QRCodeGenerator())
{
using (var qrCodeData = qrGenerator.CreateQrCode(value, QRCodeGenerator.ECCLevel.Q))
{
using (var qrCode = new QRCode(qrCodeData))
{
using (var bitmap = qrCode.GetGraphic(1, Color.Black, Color.White, false))
{
Image.FromData(bitmap);
}
Text = value;
} } } }
Xml:
<Image Source="{Binding Element.ImageSource}"
RenderOptions.BitmapScalingMode="NearestNeighbor"
RenderOptions.EdgeMode="Aliased"
Width="{Binding Element.Width}"
Height="{Binding Element.Height}"
Stretch="Uniform">
What happens:
The generated QR-Code has some light noise that you can see here in the screenshot on the left side(left side Gray8, right side BlackWhite):
What I tried:
I changed in the method Decode the Pixelformats from Gray8 to BlackWhite. The result is the screenshot above (qr code on the right side).
internal static BitmapSource Decode(string value, int? pixelWidth, BitmapCacheOption cacheOption = BitmapCacheOption.OnLoad)
{
// ..some code..
var grey = new FormatConvertedBitmap(bitmap, PixelFormats.Gray8, BitmapPalettes.Gray256, 1.0);
return grey;
}
Another thing that I tried is changing qrCode.GetGraphic(1) to something higher like qrCode.GetGraphic(10), which increases the pixels per module. But this is not a clean way to fix the problem, because the noise is just getting realy small(so you can hardly see it anymore) and the pixel per module are getting increased.
My Problem: I'm using the method decode for qr codes, bar codes and images. So If I would add an image it would be black and white. Of course I can use an if-statement and check what if its an image or or qr/bar-code. But why is PixelFormats.Gray8 creating noise? Why is it not clean?

Answer 1

I found the problem. I overlooked those lines and didnt realize that .jpeg was choosen as format:
public void FromData(Bitmap bitmap)
{
using (var ms = new MemoryStream())
{
bitmap.Save(ms, ImageFormat.Jpeg);
//...