Toning / tinging an image with a color can mean very different things to different people, and can be done in Photoshop by a huge number of different techniques, tools, plugins, etc.
So, to try to avoid spending too much time playing around with all the different possibilities, when I realize that I need / want to do something like that, the first thing I do is try to be more specific about exactly what I want: So, assuming the tint is to appear throughout the entire image, not just some area that was selected, I then try to figure out if I want the tint to appear only in the highights (do I include pure whites in this?), only in the shadows (do I include blacks in this?), only in the mid-tones, do I want it to occur only in areas that are only weakly saturated, or only in areas that are strongly saturated, do I want to turn the image into a B&W and from there, into a duotone or tri-tone, or, might I want some combination of the previous possibilities, etc. etc. Once I have done the preceding analysis, my life is vastly simpler because then I can usually go right to the tools and techniques that I need instead of trying the zillions of different tools (and settings for each) to see which ones I like.
Anyway, I put together two GIF animations about this. The first illustrates the analysis process I favor; the second shows some of the tools that one might have to consider if you don't do a bit of analysis ahead of time.
BTW, my apologies ahead of time. It was a few hours between when I first read your post and when I constructed the GIF animations, and in that time, I forgot that you asked for a gold tint, and instead thought you requested a red tint. Anyway, by the time I caught my error, I had already spent time constructing the examples, and I wasn't about do it over, so, again, my apologies.
Of course, everyone has different ways of working and approaching a problem, so just regard this as my personal preference.
Method 1 - First, classify the goal on the basis of whatever visual, optical, and artistic fundamentals you think are important. Some examples are below:
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Method 2 - Try to figure out which of the many, many different techniques for adding red to an image is the closest to what you want:
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Tom
