Semi-transparent background with a gradient.

[Ofnuts]

(04-07-2021, 08:35 AM)Mixxer Wrote: Hi

I have a semi-transparent background with a black gradient circle in the middle. The circle is solid in the middle and gets more transparent as it goes towards the edges. How do I make the background totally transparent without loosing the gradient soft edges? Cutting around won't work. I tried the magic wander but it for some reason selects the whole image. Thanks

You have to edit the alpha channel, which is done by editing the mask:

• Layer ➤ Mask ➤ Add layer mask and initialize to "Transfer layer's alpha channel"
  
• Start the Levels tool (which will apply to the mask)
  
• The histogram is likely not reaching the left edge, so just drag the black-point handle to the beginning of the histogram curve to make the least opaque bit fully transparent.
  
• You can also play wit the middle handle to adjust how the opacity is reduced.
  

   

• Once happy with the result you an apply the mask Layer ➤ Mask ➤ Apply layer mask, but you can also keep the mask around.
  

You can have even more control with the Curves tools (where you can completely "shape" the opacity change...)