03 Lining up the crosshairs
When you drag these gadgets to move them, a tiny white dot appears in the middle. It’s small enough to be accurate but visible enough that you can see it easily.
What you have to do now is choose objects in the picture which ought to be perfectly perpendicular, and I’ve chosen the columns on either side of the building. It’s possible these taper slightly towards the top, but they look like the best option so I’ll see what happens when I click the ‘Apply’ button.
04 The corrected image
This looks like a perfect result at the first attempt. The Keystone Vertical tools are still active, so you can do some tweaking if you need to, but it doesn’t look like I’ll need to here.
05 Adjusting the crop
Capture One Pro will automatically crop the image to get ride of the ‘wedges’ at the side –these are an unavoidable consequence of perspective corrections in this or any other software. The cropped areas are shown greyed out around the edges. If you like, though, you can drag the edges of the crop marquee to change the size or proportions of the picture or include details that were previously cropped out.