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How to change color qr generating to another color of black-VBForums
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  1. #1

    Thread Starter
    Join Date
    Aug 2016

    How to change color qr generating to another color of black

    I working in visual studio 2015 windows form application

    I generating qr using messagetoolkit library and it working good without any problem

    I face only one problem i need to change color of qr to another color different to

    black as blue or red or green like that

    so that how to do color qr code using messagetoolkit

    my code
    MessagingToolkit.QRCode.Codec.QRCodeEncoder encoder = new MessagingToolkit.QRCode.Codec.QRCodeEncoder();
    encoder.QRCodeScale = 8;
    Bitmap bmp = encoder.Encode(textBox1.Text);
    pictureBox1.Image = bmp;
    bmp.Save(sv.FileName, ImageFormat.Jpeg);

  2. #2
    .NUT jmcilhinney's Avatar
    Join Date
    May 2005
    Sydney, Australia

    Re: How to change color qr generating to another color of black

    If that QRCodeEncoder class doesn't provide the ability to specify a colour, you could simply change the colour of the pixels one by one:
    csharp Code:
    1. private void ChangePixelColour(Bitmap bmp, Color originalColour, Color newColour)
    2. {
    3.     for (var x = 0; x < bmp.Width; x++)
    4.     {
    5.         for (var y = 0; y < bmp.Height; y++)
    6.         {
    7.             if (bmp.GetPixel(x, y) == originalColour)
    8.             {
    9.                 bmp.SetPixel(x, y, newColour);
    10.             }
    11.         }
    12.     }
    13. }
    GetPixel and SetPixel are slow but performance should be good enough for what is likely to be a relatively small image.
    Last edited by jmcilhinney; Mar 12th, 2017 at 04:38 AM. Reason: Replaced VB code with C#
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