Make color diff functions internal
Make color diff functions internal

objcio/DominantColor,lydonchandra/DominantColor,indragiek/DominantColor,lydonchandra/DominantColor,marinehero/DominantColor,lydonchandra/DominantColor,indragiek/DominantColor,objcio/DominantColor,indragiek/DominantColor,objcio/DominantColor,marinehero/DominantColor,objcio/DominantColor,marinehero/DominantColor,marinehero/DominantColor