what does tweak mean?

Question

What's tweak mean?

Answer

When they try to find something like for pregnancy test we tweak it to find a double line u get me?

Answer

If someone posts a picture of their test and they want to know others opinions on whether it is positive or not they will ask someone to tweak their picture. It is basically someone trying to mess with the picture a bit to try and see if it's positive. Such as making the picture negative to give different color perspectives.