How to straighten horizons and fix collinearity and bad perspective

You’ll find the non-destructive Perspective tool (K) in Zoner Photo Studio X’s Develop module. (Non-destructive means that your edits will never harm your original.) It does more than in older versions of ZPS: now you can not only straighten the horizon, but also fix collinearity and perspective distortion: things like "falling" buildings and crooked walls. No wonder this feature is so popular among architecture lovers. Let’s dive in and learn how to use the Perspective tool!