I found out something based on the tip you gave me.. The original picture size from my gallery is 1.25MB, but when I upload it in my WhatsApp update or third party app, the image size reduces to 1.07 MB.
I have never experienced this in my previous cheap handys. I actually bought this Samsung Galaxy Note 8 because of pictures and sharing with friends and family through apps..But unfortunately they get poor quality pictures from me.
Can you please help me on how to rectify this problem..
Thanks for your assistance.