Lore
Lightroom Mobile Masking for Eye-Guidance (Select Subject + Brightness/Warmth Contrast)
Overview
Masking in Lightroom Mobile — isolating part of an image (most commonly via Select Subject, an AI auto-detect) and applying local, invertible adjustments — is framed as the single most powerful editing tool available to paid subscribers, because it lets an editor engineer where the eye goes rather than just improve overall exposure/color. Masking is gated to paid Adobe Lightroom subscribers; free users don't get it.
Core perceptual rule
The human eye is involuntarily drawn to whatever is (a) brightest and (b) warmest in a frame. Masking exploits this by making the subject brighter/warmer than the background, or the background darker/cooler than the subject — a mask can be inverted to flip which side ("subject" vs "background") an adjustment lands on, so the same auto-mask serves both directions.
- Brightness contrast: raise Exposure on the subject's mask. If the subject is already near max brightness, invert the same Select Subject mask and lower Exposure on the background instead of trying to push the subject further — a ceiling workaround, not a subject-side fix.
- Warmth contrast: push Color > Temperature warmer (~+20) on the subject mask; on an inverted/background mask pull Temperature cooler (~-10). Two separate Select Subject masks (one inverted, one not) are typically stacked on the same image to run both axes at once.
Workflow mechanics
- Select Subject: tap "Masking" → plus icon → "Select subject" to auto-generate a mask around the detected subject — the Lightroom Mobile analog of Select Subject & Remove Background (AI Subject Isolation), but an in-place auto-mask rather than a selection-to-layer-mask flow.
- Invert Mask: toggle on a mask's option row to flip it to "everything except" the original selection — the mechanism that lets one Select Subject call drive both subject and background adjustments.
- Mask stacking + preview: Lightroom Mobile keeps a running list of every mask made on an image; each shows a black-and-white thumbnail (white = affected area), and tapping it (red highlight) reactivates it for further adjustment. Masks are meant to be composed — the demonstrated edit stacks a subject-warm mask and a background-cool/dark mask on one photo.
- Local detail stack on the subject mask: with the subject mask active, Texture, Clarity, and Dehaze (Effects tab) are raised in descending intensity (texture > clarity > dehaze) — a personal habitual ordering, not a Lightroom-enforced rule. Sharpening (Detail tab) is then also applied only to the masked subject, reframing sharpening from a routine global step into a deliberate compositional pull toward the subject.
- Vignette as the global-eye-guidance follow-through: after local masking, a vignette (with its Midpoint control) pulls the eye further toward center — same subliminal logic as Vignette as Subliminal (Should-Be-Invisible) Eye Guidance, used here as a finishing step layered on top of local masking rather than as the sole technique.
- Global pass last: whole-image tweaks (slight Exposure decrease, Contrast increase, whole-image Dehaze, small Vibrance boost) are applied only after all local masking is done, in that order. Pushing global Dehaze too far was observed to introduce unnatural color. Related sequencing question: Global Normalize-Then-Style Baseline Before Local Masking — this source runs local masking first and a global pass last.
Related
Из тем: Lightroom Mobile: Masking, Sliders & Simulated Light