There is texture paint in one of the walls in my house. Some part of the paint has been spoiled due to moisture from neighbourhood while on construction. Actually, the texture paint is a mixture of two colours. I cannot describe the colours or their numbers. I simply want to know how to make the same colours. Will it be necessary to take the help of a painter or we can do it at home by ourselves.
Paint stores often have a color matching computer. It visually scans a paint chip, and tells the employees exactly what colors to mix together to recreate that color.
Find a paint store with that system. Ask them how big a sample of your paint (I think that's called a "chip") they will need for their computer. Ask them the best way to get that sample / those samples off your wall without damaging the wall. Then get the sample(s), bring them to the store, and have them mix up the paints that you need. Paint over the "chips" that you took off of your wall, as well as the area that has been spoiled.
You're asking about colour matching.
Try using a phone or tablet app that can display a colour wheel.
Fill the screen with a colour that's close to the target colour, put your device against an uncontaminated part of the wall, then adjust the colour until you have a match. (Whether it's an 'exact' match depends on your colour discrimination.)
Once you get a match, take the device to your favourite paint seller and ask them to mix a batch of exactly that colour for you. You might have to take into account the difference in lighting between your room and the shop.
You could use some technology.
(A Web search will give you more detailed information than space here allows.)
The NIX colour scanner ($99 US), NIX professional ($350 US)
Color Muse colour matching tool ($50 US) for paint samples
Color Grab (app) by Loomatix for Android turns a smartphone into a tool to identify colours. This smartphone app. has the highest ratings of ones now available.