Doug, can you tell me a bit more about the new structure tool? I like it, and it seems like the detail slider in LR4 in terms of bringing up fine details. I seem to be able to substitute some structure for sharpening but obviously they are not the same thing. Just curious what its doing exactly.
Techie Oriented ExplanationThere are four tools that relate to detail. Here is a very high-level technical explanation of them:
- Details slider: loosely related to the "surface" slider in v6. Changes variables/approaches in the the
underlying rendering of the data
- Sharpening: narrow-radius USM-like adjustment with limited-range adjustability on radius and threshold
- Structure: mid-radius USM-like adjustment
- Clarity: large-radius USM-like adjustment
The details slider is therefore the only one that could not be generally mimic'd in Photoshop with variously-set USM combinations. It's just nice to be able to use them in a Raw processor where you get all the normal raw-workflow benefits (apply them non-destructively, reversibly, locally, en-masse, and either at the time of capture before first-impression of the image is made or after the capture during editing)
Interestingly structure and clarity can be applied in negative amounts. I've found great results with negative structure on portraits, especially when applied as a local adjustment (e.g. masking out the eyes). Most US retouching maintains some level of the original pore-structure of the skin (other styles of retouching might go for a more plastic pore-free look; this discussion does not apply to that style) in which case a standard "blur" effect is not useful as it will blur the pore-structure. Instead you want an evening out of the skin tonality and negative structure does a great job of that. This is similar to the
low/high frequency photoshop technique (but again, without having to leave raw).
Non Techie ExplanationDetails slider: changes rendering of fine texture, and micro-detail
Sharpening: effects how much small-sized subject detail looks (e.g. the hair/eyelashes in a full-length portrait)
Structure: effects how mid-sized subject details look (e.g. the check bone structure in a full-length portrait)
Clarity: effects local contrast and "pop" of the image overall (the bodyshape and overall "pop" in a full-length portrait)