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How to apply same (color) changes from copy to original image or another copy


P

Photoposh

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For this example let's take in account that I have 2 identical in every aspect copies (meaning size and content at this point) of the very same image.

1st remains unedited,

2nd is edited only as far as concerning the image > adjustments menu through changing mostly channel mixer, selective color, saturation etc values and had an object attached to it atop of the original depiction before being edited as a whole.

What I want to do is to edit the 1st image, compare in some certain ways the colors of it I guess with the ones of the 2nd, match for instance where color hex value X (and horizontal/vertical X,Y coords - is it needed in order to be more precise and avoid mistakes?) (I guess again) from the 1st image is edited into color (or even additional settings atop of that?) hex value Z, do that automatically for all the combinations and immediately apply the same changes I applied from 2nd pic when unedited (and looked exactly like 1st pic) to the very same 2nd pic in start, TO the 1st pic in the present case. Also in order to do this "color matching" before applied or not I need to set out-seperate the area where I have added an additional object in the 2nd picture and fill it possibly with the original content from the 1st(can it be done in one move) in order for the process to be complete?

That means I turned the 2nd image into a combination of blue-green-red colour (and other) from orange-yellow-cyan (just an example) I want to do the very same to my 1st pic which is orange-yellow-cyan etc.

Thanks in advance, your help is highly appreciated!
 
So apparently there is not an automatic way to do such a thing? It seems sensible though and I guess if such a feature doesn't exist it can be easily added in the future. I am asking this so I will know at last for definite if I have to search for something else myself. BTW all this mess, if I haven't explained correctly is so that the respective area where the object was placed on will get the color change I want (Since in the 2nd image, the edited one, this area consisting of original parts was not present, and the cut out part didn't go under color change since it was removed obviously and replaced by an additional object)

Or then again, could I cut out, in the 2nd pic, the additional object (sadly I don't have the .psd that had this extra layer and I am only with the final saved jpeg), replace that part of the edited 2nd pic with the original part from the original 1st image, and by some option colorize in the way I want this specific part??? But I guess since my (2nd) image doesn't incorporate for this specific area the original parts which contain perplexed information (galaxy photo parts) if they are placed upon it again, photoshop would hardly recognize what to edit automatically and manually it would be impossible. Thanks again and sorry for bothering! If it can't be done you can just notify and I will try to overcome this problem by myself (starting anew or so)!
 
Hey Photoposh, be patient, someone will come along to answer your question. Not all of our members are online right now.
 
Oh, sorry, I did not intend to convey this message. Just a possible answer if there was no way for what I want to do so I would start anew for now. Didn't intend to bother again.
 
Your not bothering anyone. There may be a way to do what your wanting to do, it's just that a person qualified to answer your question has not seen it yet. As I said, not all of the members are logged on to the forum right now, it may take a little while.
 
Hey, Posh -

Let me re-state in mathematical terms what I believe is your question:

Regard all the processing that was done on an image as a mathematical function that takes each triple of three variables, say, (H,S,L), and maps them into different values (H', S', L'). If I understand you correctly, based on a large number of pixels in one before-after image pair, you want to come up with a good estimate of that rule so that you can apply it to other things added to that image, apply it to entirely different images, etc.

If that's what you want, that's a very, very interesting question. However, as far as I know, there is no feature built into PS, nor in any add-ons / plugins that I am familiar with that will do what you ask in anything approaching an automatic manner.

This is not to say that it couldn't be done, just that if it has, it's probably only available in the technical image processing literature. As I get some time, I'll keep this in mind and see what I can find, but it probably will be an algorithm written using the Matlab Image Processing Toolbox, or some another programming language, so it probably wouldn't be of that much use to you.

However, let me offer a possible DIY workaround:

1. Put your "before" image at the bottom of a layer stack. (Layer 0)

2. Put your "after" image above it. (Layer 1)

3. Change the blending mode of L1 to either "difference" or "subtract".

4. In preparation for needing to amplify small differences, put a "Levels" adjustment layer at the very top of the stack. (Layer 2). To amplify small differences, move the two endpoint sliders in towards the center.

5. Here is where the art of the method and and experience comes in. Start introducing adjustment layers between L0 and L1 as you see fit to try to make L0 + the effects of the adjustment layers look like L1. You can do this initially by eye, but eventually, you will get to the point where you want to magnify small differences. This is where L2 comes in.

6. When you get a set of adjustments that transform L0 into a good approximation of L1, you can now open another image and apply the exact same set of adjustment layers (together with all of their settings) over to the new image. This certainly isn't automatic, and depending on how good you are, it may be only a rough approximation of what you need, but it's better than nothing.

There was a thread on exactly this method maybe 6 - 9 months ago. It included an example. I'll try to find it for you.

Great question.

Cheers,

Tom
 
Tom Mann, thanks a lot for your aid and guidance! I believe your solution as I see it is a very good choice, will try to implement it, and come back with the results and image. And yes you described my request correctly! Cheers!
 
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