diff --git a/vector/src/main/java/im/vector/riotx/core/qrcode/QrCode.kt b/vector/src/main/java/im/vector/riotx/core/qrcode/QrCode.kt
index a4e7ee2e07..0af2cf6777 100644
--- a/vector/src/main/java/im/vector/riotx/core/qrcode/QrCode.kt
+++ b/vector/src/main/java/im/vector/riotx/core/qrcode/QrCode.kt
@@ -18,27 +18,31 @@ package im.vector.riotx.core.qrcode
 
 import android.graphics.Bitmap
 import android.graphics.Color
+import androidx.annotation.ColorInt
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.common.BitMatrix
 import com.google.zxing.qrcode.QRCodeWriter
 
-fun String.toQrCode(width: Int = 200,
-                    height: Int = 200): Bitmap {
+fun String.toQrCode(width: Int,
+                    height: Int,
+                    @ColorInt backgroundColor: Int = Color.WHITE,
+                    @ColorInt foregroundColor: Int = Color.BLACK): Bitmap {
     return QRCodeWriter().encode(
             this,
             BarcodeFormat.QR_CODE,
             width,
             height
-    ).toBitmap()
+    ).toBitmap(backgroundColor, foregroundColor)
 }
 
-fun BitMatrix.toBitmap(): Bitmap {
+fun BitMatrix.toBitmap(@ColorInt backgroundColor: Int = Color.WHITE,
+                       @ColorInt foregroundColor: Int = Color.BLACK): Bitmap {
     val height: Int = height
     val width: Int = width
-    val bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565)
+    val bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)
     for (x in 0 until width) {
         for (y in 0 until height) {
-            bmp.setPixel(x, y, if (get(x, y)) Color.BLACK else Color.WHITE)
+            bmp.setPixel(x, y, if (get(x, y)) foregroundColor else backgroundColor)
         }
     }
 
diff --git a/vector/src/main/res/layout/item_verification_big_image.xml b/vector/src/main/res/layout/item_verification_big_image.xml
index 9f33b6c03c..e4a0db917f 100644
--- a/vector/src/main/res/layout/item_verification_big_image.xml
+++ b/vector/src/main/res/layout/item_verification_big_image.xml
@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ImageView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/itemVerificationBigImage"
     android:layout_width="match_parent"
     android:layout_height="180dp"
     android:layout_margin="8dp"
-    android:src="@drawable/ic_shield_trusted" />
+    tools:src="@drawable/ic_shield_trusted" />