Page 165 - (DK) Advanced Photography Guide

IM AGE ENH A N CEMEN T 163

REMOVING CHROMATIC ABERRATIONS
Constrain Crop
The Remove Chromatic Aberration tool
automatically counters the effects of red/
green or blue/yellow chromatic aberration,
but it does not remove the purple/green
fringing often seen when using fast prime
lenses at maximum aperture. This can be
removed by selecting Defringe, then
adjusting the
CROP THE IMAGE Defringe Amount and
Amount
Check Constrain Crop to Purple Hue 30/70 0 the Purple and
automatically crop the photo and remove Amount 0 Green Hue sliders
any curved edges that were created when Green Hue 40/60 (see left).
correcting distortion in step 3.

THE RESULT ▼ BEFORE CORRECTION ▼ AFTER CORRECTION
If you are careful with your adjustments, you can straighten out
subtly bowed lines in buildings (see p.100). Fringing (see above)
and vignetting (see right) have also been removed.

US_162-163_App_Lens_Correction.indd 163 06/02/2018 11:36