How to Delete Back groundof an image??

Question

hi..
I have an image with black letters written over yellow back ground.Plz tell me how to Extract the black letters and remove the yellow back ground using J2me.
Regards
Gopal

Answer 1

Hi
conver the image to a mutable image object ( I hope u are using MIDP 2.0). Get the pixels from the image object. Extract the RGB values from the int array that u get after getRGB() . Check the R, G, B values of the pixels .. if they pixel is black then the R, G and B values must be closer to 0. Set a limit , dont touch the values close to 0 but for values that are higher than the black limit set R , G, and B component to 255. Then create an Image Object using this new int array.
Now the image will have a white back ground and Black letters remain intact.
U can set the Alfa value , i.e. the first 8 bits in the integer array of pixel values to 0 .. this would make the image transparent.
Dont know if this helps you .. but in case u want to do something like this ... have a look at
Image.createImage()
Image.getRGB()
methods in the API ( MIDP 2.0 offcourse)
regards
r@i