Colorizing with blend modes and Opacity

Now creating a custom gradient is all very well and good.…But if that was your only option, it would mean you'd have to customize even the…best of gradients on an image-by-image basis because…the luminance levels in every single image are different.…But if instead, you'd just like to take your collection of…gradients and shoehorn them to fit an image, just make them fit.…Well in that case the solution is…to adjust the Blend modes and Opacity settings.…And here's what that looks like.…I'll start things off by double-clicking on the thumbnail for this Quad Tone layer.…

And then I'll click the down pointing arrowhead and I'll…just grab one of my preset gradients such as Green Repeat.…And you can see how it ends up creating these sort…of ghostly areas of green inside of the darkest of the shadows.…That's probably not the effect we're looking for right off the bat…because it ends up with a lot of Posterization inside the image.…So…I'll hide the Properties panel.…To make any gradient work, if you just want to map it to the existing luminous…