Not sure how? It really is very simple - just rely on the JPEG histogram. The one on the back of your camera will do, or one derived from a JPEG by some viewer, or (sometimes) even by a RAW converter.
Many strongly colored objects - yellow, red, blue, pink, orange, purple, etc. are suffering from culling based on JPEG histograms.
FastRawViewer is the only culling tool that displays the true RAW histogram, which allows you to determine if the shot was exposed correctly.
So, if you don't want to trade your (technically) best shots for worse ones, start using RAW histograms for culling!