does anyone know if there is a way in Photoshop to merge two layers but maintain the blending modes that those layers might have applied. For example merging a layer with "multiply" with another layer with "overlay".
There is no direct way of doing it, but why do you need to merge them? If its necessary to keep them as their blending modes now, you might as well just draw on top. if its about layer styles, you can duplicate them, merge them, and then turn the fill of the new layer all the way down.
what will work differently, and this also depends of why you need to merge them, is you can grup them, and then apply a layer style to the group.
Try hiding all layers except the two you want to merge, and then doing a "merge all visible layers". For whatever reason this type of merge is often more reliable towards blending modes then simply merging layers down.
duplicate the layer with the blending mode you want to merge down.
Set the original back to normal.
select the blended (duplicate) layer.
merge down (ontop of the original unblend mode-ed)
That might not work in all situations, but it should at least work for overlay.
Old thread but in case people are still looking for a solution to this, you can use Sergey Kritskiy's Layer Factory extension to merge layers while preserving its transparency and blendmode effects using its bake functions, specifically 'bake to transparent'.
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what will work differently, and this also depends of why you need to merge them, is you can grup them, and then apply a layer style to the group.
Set the original back to normal.
select the blended (duplicate) layer.
merge down (ontop of the original unblend mode-ed)
That might not work in all situations, but it should at least work for overlay.
(edit: tal-mac may have beaten me too it hah)
Photoshop Merging Blended Layers
Extention: https://kritskiy.gumroad.com/l/factory?layout=profile
Documentation specifically regarding this feature (there are a lot of features in this extension): https://layer-factory.readthedocs.io/en/latest/bake/index.html
Yes this it's paid, but the man is hands down one of the most important extension creators for 2d Photoshop concept artists ever so its worth it.