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I have searched for an answer on how to remove a black background to make a transparent image, but none have answered my specific question.

Here I have rendered a scene with a light-emitting cube. Unfortunately, Blender 3D (the software I used for rendering) doesn't allow me to make the background transparent while also keeping the edge glow, so I want to achieve this effect in photoshop. Many of the answers involve using a screen blend mode, but that will not work for me because I will need the image with a transparent background, not another solid color background.

enter image description here

How can I remove the black background of this image while also keeping the edge glow of this object? The final image should have a semi-transparent background because the edge glow should be semi-transparent.

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    This is fairly easily recreated in Photoshop alone via Outer Glow Layer Styles on a hexagon shape layer. – Scott Jan 13 at 1:35
  • @Scott I actually tried that but it's not sustainable for other parts of my project. – Alex Jan 15 at 1:17
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Let's do it.

First, convert the file to Lab mode. Select the L channel. Increase the black a little to make it more black. I used Levels with black output to 10. Now we can use the L channel to load a selection.Ctrl + LMB.

Back to Layers panel, I created two new Layers and fill then using the colors I show in the image below. alt + Shift + Delete.

After a lot of attempts, that is the best match I found. Just convert it again in RGB and save the file as PNG.

Edit: Remember to hide or delete the background before saving the file.

enter image description here

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