How to darken an image in Photoshop 2021

Adding Edge Darkening (Vignetting)

This is the same dark edge effect from Lightroom on your desktops

Results panel (unlike the most restricted version on Lens Corrections for desktop

panel), so while you can use it to light the corners to remove the vignetting lens, you're

maybe you come to this feature to add a darker shade. 

Tap an image to open it

Loupe view, then tap on the edit icon in the action options at the bottom of the screen.

When the repair tiles appear, tap the shutter icon on the left side of the tiles again,

from the Edit pop-up menu, tap on Vignetting. 

Near the right of Vignetting

fixing tiles, tap the style tray and a pop-up menu will appear in three different styles.

I highly recommend using the Highlight Priority style (as shown here), like the other two

shake well (and that is kind). Now, to add a black edge effect, tap on

Number the tiles, then drag the slide to the left to darken the edges. 

Tap on Midpoint

tap and drag its slide to the right to move the effect near corners, or to the left

so that the effect extends forward to the image (I drag to the right only when I try

remove vignetting from corners). 

The Feather Tile controls the gentleness value of

vignette edge - pulling on the left makes it softer; drag right does it

Harder. Also, the Roundness tile does just what you think it does - it drags to the right

it makes it round and soft; dragging to the left makes it harder and more elaborate, until

it looks like a round rectangle.