Thanks Neil, You are on the same page as me, I want to keep the RAW as a base and process to JPEG only when I need to display or print. The method is "Color Matching" through the Adjustments menu and not a blend mode, at least not specifically on the JPG layer. It may be an informal blend carried out through the adjustment but I don't know how to confirm this. The RGB shift method is certainly worthwhile but I have to find a method on how to do this. I making a number of assumptions in doing this, such as the color shift is uniform across the image but essentially I want to pick a specific point on the image and move the RGB by a set amount it from, say, 134,84,57 to 139,82,51 and apply that shift over the whole image. And that's where I'm stuck, I can't find how to do it or, in fact, if it is even possible
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