Incremental vs all-at-once H/S adjustment

Forum|Forum|5 years ago
May 12, 2020
2 replies
1423 views

Did a forum search and didn't find an answer. Also tried a general Google search and didn't find an answer. I may not be using the right search strings to generate the correct information.

Why would applying incremental changes to H/S via multiple adjustment layers produce a different result than applying the same total application on a single H/S layer?

E.g., Applying a Master Saturation adjustment of +10 and duping that layer 6 times (7 total H/S layers) gives a much different result than applying an adjustment of +70 on a single layer.

Thanks

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Chuck Uebele

Community Expert

In that case, it all depends on their algorithm. The +10 is most likely a multiplier. The scale is from 0 to 100, so a +10 could be only a .1 times increase. Hard to say without actually knowing the algorithm.

P

PhotogCdaAuthor

Inspiring

Sure. It will depend the algorithm. I just didn't know if there had been any explanation from Adobe, or one of Adobe's contracted experts, that I haven't been able to find.

c.pfaffenbichler

Community Expert

But why would you expect the Saturation setting to operate »additively«?

Have you done some basc testing (not on a photograph naturally but on meaningful color swatches)?

Chuck Uebele

Community Expert

Just iff the top of my head, the +70 in a single layer adjust the values just from the base layer. With 7 +10 adjustment layers, you're compounding the adjustments. You're not just changing the base layer, but all the corrections to the base layer.

P

PhotogCdaAuthor

Inspiring

Sorry, I should have also noted that the incremental result is less dramatic than the single layer approach.

I get what you're saying and intuitively that makes sense. The end result is different; however. It doesn't appear to compound the result of each successive layer.

Examples attached. The first is the incremental approach, the second is all-at-once.

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