ContrastPop

**What ContrastPop does.** This Resolve FX adjusts local contrast by increasing or reducing brightness differences around structures of a chosen scale. It is neither a global contrast curve nor an automatic subject-selection tool.

**Availability and evidence.** Blackmagic classifies Contrast Pop as a Studio-only Resolve FX. The archive contains a genuine Fusion Controls capture with five sliders, but no Flow-socket capture or rendered output. The static lessons are not a Resolve Studio acceptance test.

**Detail Amount: the neutral baseline.** Amount = 0 is neutral for the local-contrast adjustment. Start there, lock the source, and change one control at a time; otherwise halos, texture changes and noise are hard to attribute.

**Positive Amount.** Positive values make texture and shape appear crisper and higher contrast. This can help metal, stone or product imagery, but it does not guarantee true optical sharpness: local halos can merely mimic it.

**Negative Amount.** Negative values reduce local contrast for a softer, low-contrast look. This is an intended direction of the effect, not a slider mistake. On faces, inspect moving footage so that natural texture is not flattened.

**Detail Size selects spatial scale.** Fine texture and broader shapes respond to different Size settings. Size is spatial selection, not a second intensity dial. Choose the affected structures before finalising Amount.

**Low Threshold protects shadows.** This is the lower limit of the tonal range affected by the filter and can help avoid bringing up dirty shadow texture. It is not a stand-alone weak-edge detector or a guaranteed denoising operation.

**High Threshold limits highlights.** The upper boundary can exclude bright tonal regions so that speculars and windows do not become brittle. Adjust it on the same frame and in the same color state as Low Threshold.

**Softness feathers tonal selection.** Softness blends the transition between affected and protected tonal regions. Increasing it will not cure halos caused by an inappropriate Detail Size or excessive Amount on broad objects.

**Tone and spatial scale are independent.** Thresholds select tonal values while Size selects structure scale within them. Raising High Threshold is not equivalent to increasing Size, and Softness is not image-wide blur.

**Inspect the 100% Viewer.** Local contrast can look impressive when downscaled but fall apart at pixel resolution. At 100%, check hard-edge halos, exaggerated compression blocks, shadow noise and brittle skin texture.

**Portrait workflow.** Positive Amount may emphasise pores, lines and makeup; negative Amount may smooth texture too far. Inspect both skin and hair, and do not paste architectural settings onto faces without checking.

**Product imagery.** For stone, fabric, furniture or metal, the effect can strengthen perceived relief without primarily changing global exposure. Find the structure scale first, then exclude noisy shadows and harsh speculars.

**Noise handling.** ContrastPop can reveal noise already present, but is not a noise-reduction algorithm. Clean the signal upstream when needed and restore structure cautiously; aggressive Blur can remove useful detail as well.

**Localized use without invented sockets.** The five controls are visible in the source Inspector, but a physical ContrastPop Effect Mask socket is not evidenced. The teaching example localizes its result using Rectangle on a separate Merge.EffectMask.

**Do not confuse ContrastPop with Sharpen.** Sharpen changes edge acutance differently; ContrastPop sculpts perceived detail by spatial scale and tonal range. Both can produce halos, so compare them on matched frames before stacking.

**Processing order matters.** Judge the filter after establishing basic contrast, in a known processing space and at delivery resolution. Changing the upstream tonal curve alters which parts of the signal Low and High thresholds select.

**Animation and continuity.** The five photographed sliders show keyframe diamonds, but a static diagram does not prove the temporal behavior of the algorithm. Check texture shimmer, halos on moving edges and cuts with changing illumination.

**Verify Settings rather than guessing.** The original screenshot shows a closed Settings tab. Therefore generic Blend, Motion Blur or alpha controls are not presented as confirmed ContrastPop controls; inspect the installed build directly.

**Acceptance boundaries.** Code checks establish article structure, connected teaching graphs and image/mask types. They do not certify physical plugin sockets, visual quality, numerical RGBA processing, Studio availability or an actual Resolve 21 render.