How to create a brightness gradient?

[Andy_C]

(09-14-2022, 02:03 PM)rich2005 Wrote: For a hands-on eyeball method.

Add a layer above.
Set the layer mode to Soft light 
Draw in a black-to-white gradient (left to right) very little on the black side.
Adjust the layer opacity to suit.

That's great, thanks @rich2005

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(09-15-2022, 08:57 AM)Ofnuts Wrote: IMHO mostly  a matter of contrast. A rather quick fix;

• Duplicate the layer
  
• On the copy, increase contrast until the left side looks like the right side of the original
  
• Add a layer mask
  
• On the mask, add a gradient white (left) to black (right) gradient
  
• While in the gradient tool, click on the line to add a "stop" and move it around to adjust the opacity change.
  

Thanks @ofnuts!