How to combine the different saturation sliders?

I'm not sure that understand how LR4 combines the overall saturation slider and local adjustments. Two questions in "BOLD" at the bottom.

I did the following experiments:

1) begins with an image raw color, version 2012 process, intact.

(2) bring a lower overall saturation to-100

(3) add a graduated with a + 100 saturation filter (I added, say, sharpness-100 to see precisely which side the filter is applied)

I would expect half of the picture to color and a half b & w. Instead, the filter is totally ineffective (that is, it has absolutely no effect, you can see this turning point). So I assume that the total saturation is not "additive" (i.e. - 100 + 100), but perhaps "compound" (i.e. the product of 1 + p/100). If this were true, then any cursor to-100 equal would bring saturation at least. Let's see if this is true:

(4) set overall saturation to-100. any value for the saturation of the filter is ineffective

(5) set saturation to-100 and 0 overall saturation filter. now (say) in my photo, the sky is blue on the left and the gray on the right.

(6) slowly move overall saturation from-50 to + 100: changes in the gray sky. a.... less saturated gray to a sort of... supersaturation in gray (more blilliant and slightly yellow?).

so, the conjecture is false, and it seems that the filter is applied first, and the overall value is applied last, IGNORING what the filter may be done (so if the blue transformed filter in gray, then "saturate" the gray).

(A) is - this documented anywhere?

B) in particular, if I want to do everything except a very small area, Desaturate I have to paint the complement of the area including the saturation - 100 who feels quite natural (I want to do something on the small surface paint). Is there a solution?

Thank you
HD

Yes.

In addition to the local against the global problem of clipped pixels command, most algorithms have limits, and what happens when adjustments push them these limits depends on the adjustment.

For example:

local highlights:

(assuming that global highlights = 0)

-50 & -50: same effect as-100

but

-50-50 & -50: effect is stronger than-100, but not as strong as-150.

Why?

because you're to reach the end of this who-highlights can do, and instead of just stop working completely (and suddenly), the effects of other residents begins to roll-off (large cone). Similarly for the shadows. Highlights/shadows points threshold is 100 - nothing more than that and you get diminishing returns.

FWIW - that's why the globals for those who are limited to 100 - so there is enough clearance for the inhabitants to have some effect, even if it is as you would expect.

Also big problems because of the order at the local negative values have a different meaning than positive values.

One of the most critical, especially if the conversion of photos of 2003 with a local negative sharpening (radical change to negative (local) sharpening) introduced in PV2010:

Total amount local sharpening > 0 adds to overall (not sure what is happening to the limit max).

-1 to-50 (partial sharpening total is hidden)

-50 to-100 (blur)

Another biggie - local clarity. Since negative local clarity is applied before overall positive clarity (as opposed to being consolidated) and negative clarity works radically different "less positive" clarity, there is a huge difference between the setting of high overall clarity and applying negative clarity (locally) too specified regions, versus applying lower overall clarity and complete within the regions clarified using local clarity with positive values. It is the one that bit me a bunch, but thanks to the issue raised by this thread, there will be no more...

I really wish that Adobe documents such things, then we'd know since him commenting rather than find out later...

Rob

Tags: Photoshop Lightroom

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