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<blockquote data-quote="paul_b" data-source="post: 589503" data-attributes="member: 15676">I found this on the web and thought it would be interesting to copy and paste it here:From what I recall in LR 4 when PV2012 was first introduced the Auto&nbsp; Tone button would produce unequal values for Highlights and Shadows. I&nbsp; believe this was changed sometime in LR5 so that the Auto Tone button&nbsp; now always produces equal and opposite values&nbsp; (-Highlights = +Shadows). Also I don't think I've ever seen Auto Tone&nbsp; produce +Highlights = -Shadows since Adobe made this change. So why does&nbsp; it work?&nbsp; &nbsp;The PV2012 Tone controls work on specific tonal regions with some&nbsp; overlap and interaction, but still very much focused on their defined&nbsp; Histogram areas. You can see these areas by running the mouse pointer&nbsp; over the Develop module histogram. The Highlights and Shadows controls&nbsp; can be thought as controls that work on opposite ends&nbsp; of a Tone Curve, but use a much more complex algorithm. If the settings&nbsp; are not kept &quot;equal and opposite&quot; the image data levels will be shifted&nbsp; to the left or right in the histogram causing a much stronger&nbsp; interaction with all of the other control areas. This will require much&nbsp; more Tone control &quot;tweaking&quot; when attempting to produce a properly&nbsp; adjusted image.&nbsp; &nbsp;Exposure: Midtone Brightness (30%-70% Levels)&nbsp;Contrast:&nbsp;&nbsp; Midtone Contrast&nbsp; &nbsp; (30%-70% Levels)&nbsp;Highlights: Highlight Area&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (70%-90% Levels)&nbsp;Shadows: Shadow Area&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (10%-30% Levels)&nbsp;Whites: White Point Area&nbsp; &nbsp; &nbsp; &nbsp; (90%-100% Levels)&nbsp;Blacks: Black Point Area&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; (0%-10% Levels)</blockquote>

[QUOTE="paul_b, post: 589503, member: 15676"] I found this on the web and thought it would be interesting to copy and paste it here: From what I recall in LR 4 when PV2012 was first introduced the Auto Tone button would produce unequal values for Highlights and Shadows. I believe this was changed sometime in LR5 so that the Auto Tone button now [B]always produces equal and opposite values[/B] (-Highlights = +Shadows). Also I don't think I've ever seen Auto Tone produce +Highlights = -Shadows since Adobe made this change. So why does it work? The PV2012 Tone controls work on specific tonal regions with some overlap and interaction, but still very much focused on their defined Histogram areas. You can see these areas by running the mouse pointer over the Develop module histogram. The Highlights and Shadows controls can be thought as controls that work on [B]opposite ends[/B] of a Tone Curve, but use a much more complex algorithm. If the settings are not kept "equal and opposite" the image data levels will be shifted to the left or right in the histogram causing a much stronger interaction with all of the other control areas. This will require much more Tone control "tweaking" when attempting to produce a properly adjusted image. Exposure: Midtone Brightness (30%-70% Levels) Contrast: Midtone Contrast (30%-70% Levels) Highlights: Highlight Area (70%-90% Levels) Shadows: Shadow Area (10%-30% Levels) Whites: White Point Area (90%-100% Levels) Blacks: Black Point Area (0%-10% Levels) [/QUOTE]

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