Replacing B&W with a gradient of colors

[defaultu8ebda2q7fx6]

Hi,

I'm currently facing some technical issue. I have a black & white image, with a transparent background. In addition, I have a (linear) gradient, from one color (yellow) to another (purple). I'm trying to create a replica of the B&W image, such as each gray pixel turn into a pixel colored in the same proportion of yellow/purple as it was colored in white/black.

There is another way of describing this probleme : let's assume you have a bicolor picture, and you know the two main colors (each pixel being colored with a combination of those two).  Simply apply a B&W filter to your image. Then, given the two initial colors, how can you reconstitute the first picture ?

If you have any idea to do this, feel free to volunteer your answer !

Thanks a lot 🙂

[davescm]

Use a gradient adjustment layer. That will convert the black to white tones into the colours you set in the gradient adjustment layer properties.

Dave

[Conrad_C]

There are two kinds of gradient adjustment layers, so for this purpose make sure you select Gradient Map, not Gradient Fill.

[stephaniea47539078]

Hello, I was wondering if someone can advise on a method (if there is one) to do this with two gradients to be applied depending on grayscale value being above or below a certain amount (i.e if the rgb value is 127,127,127 or below, apply gradient A and if it's over 127 apply gradient B)? 

[c.pfaffenbichler]

Why don’t you »pack« both gradients into one gradient? 

If that isn’t possible a more involved scenario (utilizing Blend If and Adjustment Layers) may be necessary. But that should be don in 16bit. 

[stephaniea47539078]

Great, thank you very much (and again for the very quick response!)

[c.pfaffenbichler]

An alternative: