Export Image with blend mode lighten to PNG?

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1

Hi, How do I export 1 image that has blend mode lighten on and save it as PNG and get the transparency?I tried but get blacks BG. I need to stack several images on top of each other and that’s why I need it saved with the transparency.

Got a floorplan with lights turned off and lights on layer with blend mode lighten.

2

as far as i know, you can try to flatten the image first with your preferred blend mode

then go to the export section and click on the 3 dots to change the color profile between sRGB or Display P3

hope that helps