Comparing paint chips under the florescent lights in a home improvement store is not the most reliable way to pick a new paint color.
SureSwatch is an alternative. Apply two coats of sample paint to the clear film sheets, and hang them on your wall when they’re dry. A lightly tacky backing keeps them in place.
The painted film sheets will give you an idea how the wall will look with a new color applied over primer or an existing wall color. The kit also comes with guides to help you choose a primer color, should you need one. $2.94 for three-pack at homedepot.com.