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First steps towards a new adjustment tool

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  #21  
Old 06-25-2015, 09:37 PM
joe_7 joe_7 is offline
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Re: First steps towards a new adjustment tool

Basically what I did:

-find optimal 16 color palette in source image, sort by luminosity, stretch palette to 256 colors (could be more)
-map colors to the destination image via RGB distance (r * r + g * g + b * b)

So it's mapping color, but in an averaged out way. I'm not sure I fully understand the problem yet, but perhaps the goal is to make the destination image's histogram similar to that of the source image?
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  #22  
Old 06-26-2015, 04:39 AM
Doug Nelson's Avatar
Doug Nelson Doug Nelson is offline
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Re: First steps towards a new adjustment tool

Funny you should mention histograms. My first iteration of this idea I pitched directly to Adobe, as a histogram matching tool. But it was quickly demonstrated to me that this is a poor way to approach this. At the time I fought it, but I've since come to agree.

Which is why I brought up the Premiere tool several posts up, as adding location to histogram seems like a plausible direction. But it only made things more confused.
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  #23  
Old 06-26-2015, 10:00 AM
joe_7 joe_7 is offline
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Re: First steps towards a new adjustment tool

If L/M/D means light/medium/dark:

Code:
1st image:
|LLLLLLLLLLLLLLLL|MMMMMMMM|DDDDDDDD|

2nd image:
|LLLLLL|MMMMMMMMMMMMMM|DDDDDDDDDDDD|
Pretend dragging the split marks in the second image to match the first.

Is this the idea?
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  #24  
Old 06-26-2015, 11:22 AM
klev klev is offline
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Re: First steps towards a new adjustment tool

Quote:
Originally Posted by Doug Nelson View Post
Funny you should mention histograms. My first iteration of this idea I pitched directly to Adobe, as a histogram matching tool. But it was quickly demonstrated to me that this is a poor way to approach this. At the time I fought it, but I've since come to agree.

Which is why I brought up the Premiere tool several posts up, as adding location to histogram seems like a plausible direction. But it only made things more confused.
It was also done more than a decade ago. You pitched them something they were well aware of and had probably tested internally. In fact that's one of the papers I didn't link (because it sucks). The naive approach was to match both mean and median.
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