How to change color qr generating to another color of black

Question

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);

Amit Gupta · Answer

Instead of using the setpixel function I ll suggest to look at the properties of your qrcode library it might allow you to choose the color. Good luck !!

Amit Gupta · Answer

Add this function to your code public static Bitmap ChangeColor(Bitmap scrBitmap Color color) { //You can change your new color here. RedGreenLawnGreen any.. Color newColor = color; Color actualColor; //make an empty bitmap the same size as scrBitmap Bitmap newBitmap = new Bitmap(scrBitmap.Width scrBitmap.Height); for ( int i = 0; i { for ( int j = 0; j { //get the pixel from the scrBitmap image actualColor = scrBitmap.GetPixel(i j); // > 150 because.. Images edges can be of low pixel colr. if we set all pixel color to new then there will be no smoothness left. if (actualColor.A > 150) newBitmap.SetPixel(i j newColor); else newBitmap.SetPixel(i j actualColor); } } return newBitmap; } } Calling the above function from your code MessagingToolkit.QRCode.Codec.QRCodeEncoder encoder = new MessagingToolkit.QRCode.Codec.QRCodeEncoder(); encoder.QRCodeScale = 8; Bitmap bmp = ChangeColor ( encoder.Encode(textBox1.Text) Color.Red); pictureBox1.Image = bmp; bmp.Save(sv.FileName ImageFormat.Jpeg);

Uehara Ayaka · Answer

refer to this article http://www.c-sharpcorner.com/UploadFile/38268a/generating-qr-code-in-C-Sharp/

Amit Gupta · Answer

@Ahmed 1. You haven't answer the important part. Have you checked the qrcode library? Are they allow user to choose the qrcode color? 2. If not then try some changes on the previous snippet as below if (actualColor ==Color.Black) newBitmap.SetPixel(i j newColor); // else // newBitmap.SetPixel(i j actualColor); Feel free if you have any doubt

ahmed salah · Answer

I attached my sample i have only form1 windows form have controls picturebox1 textbox1 button1 i write in textbox then click button to generate result of qr generating will display in picture box what i need to display with color red without using color black

ahmed salah · Answer

I attached my sample i have only form1 windows form have controls picturebox1 textbox1 button1 i write in textbox then click button to generate result of qr generating will display in picture box what i need to display with color red without using color black

Amit Gupta · Answer

It would also be helpful if you can upload your sample qr code to us for better understanding

ahmed salah · Answer

this is output result of ChangeColor function

ahmed salah · Answer

thank you for reply it not what i need i need to change color black of qr code to red but when i apply solution you give me it convert all picture to red i need balck line of qr convert to red now i cannot read qr the output result as below

ahmed salah · Answer

only one minute if possible i see article i get this function static Bitmap ReplaceColor(Bitmap source Color toReplace Color replacement) { var target = new Bitmap(source.Width source.Height); for ( int x = 0; x { for ( int y = 0; y { var color = source.GetPixel(x y); target.SetPixel(x y color == toReplace ? replacement : color); } } return target; } how to set this function according to my code if possible help me

Amit Gupta · Answer

Look at the link just you need to pass your bitmap as parameter. Visit the accepted answer there.

ahmed salah · Answer

how to make set pixel to code above if possible

Amit Gupta · Answer

Use setpixel to change the color http://stackoverflow.com/questions/17208254/how-to-change-pixel-color-of-an-image-in-c-net