I have sure that the color is always the same purple, every id card has this background.
Do you know how can i transform this specifically region purple to some one more easy to read the code?
I saw the class "DecodeHander.java" and more specifically the method decode(byte data, int width, int height). Do you know if i can change something here to get it?
You should try transposing the data in that file into a new data array. The process should map anything that is close to your purple background color into a dramatically lighter version of it. Then pass the new array to the rest of the decode method.