The real question would be, why would a trader take a screen shot of his charts? My reason is to save time, frozen.. so I can go back and look at my analysis prior to the imminent move.
A minimum of 3 per day as my standard trading log/journal. Additionally, I take extra screenshots of other patterns I track when they show up and add them to my catalogue/database.
be sure to set your computer for high resolution screen shots; there are settings that give great shots.
Bingo. In fact, a screenshot at the time of the trade (within a few minutes) versus a screenshot at the end of the trading day...they are completely different screenshots but the latter a common favourite of those doing hindsight analysis...it looks so much prettier that way. This distinction in studying / documenting / reviewing your charts is a critical aspect of self-learning and explaining to others your trade methodology. wrbtrader
Instead of screenshots, I do video record the session. It’s handy if something happens, To show either to yourself or the broker.
I use OBS Studio. It’s free and does the job. It gets heavy on resources after 8+ hours. Don’t know where the load comes from though.