RESOLVE 21 · DIGITAL COMPRESSION TEXTURE
JPEG Damage.
Damage strength.
Block geometry. Frequency direction.
Resolve FX JPEG Damage is compact because its controls solve three different problems rather than dozens of small ones: Quality sets the overall compression-damage level; Resolution and Block Aspect Ratio shape macroblocks; Frequency Scale and Scale Component define the frequency character and direction. Global Blend belongs at the end, after the damage itself already reads correctly.
Quality
Resolution · Block Aspect Ratio
Scale · All / X / Y · Blend
Do not use Global Blend to rescue a bad block pattern. First decide how damaged the image should be, then what the blocks should look like, then whether the frequency structure should be neutral or directional. Blend only the finished result.
Teaching proxy, not Resolve rendering. The SVG exaggerates block geometry, directional frequency cues and edge ringing so the control relationships are visible; it does not reproduce Blackmagic’s JPEG simulation, DCT/quantization math, color transforms or exact slider response.
Four native Resolve interface views + an explicitly synthetic compression-damage teaching proxy
4 native views · 6 controls · 4 exercises01WHAT JPEG DAMAGE ACTUALLY SEPARATES
Strength, geometry and frequency are independent decisions.
The interface is small, but each control sits at a different conceptual layer. Treating them all as “more damage” makes the effect hard to tune.
Damage strength and block geometry are separate
Quality sets the overall level of JPEG-like degradation, while Resolution and Block Aspect Ratio define how coarse and stretched the visible block structure becomes. If the image is simply too damaged but the artifact shape is right, change Quality. If the strength is right but blocks have the wrong scale or direction, move to the geometry controls.
Frequency Scale changes character, not merely strength
Blackmagic describes Frequency Scale as a control that sharpens the effect. In practice, treat it after Quality and block geometry: first establish readable compression structure, then alter its frequency sharpness. Otherwise it is easy to confuse overly sharp structure with simply excessive damage strength.
Scale Component chooses the damage axis
All Frequencies is the neutral starting point. X-Frequency and Y-Frequency constrain the frequency-side behavior to one axis and can turn a general compression look into a more directional digital artifact. This is a design decision, not a way to “improve quality.”
Fine lines, text, hair, gradients, and moving edges reveal JPEG-like damage differently. A stylized breakup can look attractive on a still yet turn into nervous flicker or an obvious block grid in playback. Final approval should happen at 100% view and on a representative encode.
02FOUR NATIVE VIEWS · COMPLETE CONTROL MAP
Read the Inspector from damage strength to final mix.
The four project captures document the actual Resolve panel and Scale Component menu. No extra JPEG Damage controls are invented to make the page look more complex.
DAMAGE · MASTER STRENGTH
Set the overall JPEG-like damage level first
- Quality
The primary compression-damage control. The reference manual describes it as lowering image bit depth; visually it governs how strongly JPEG-like breakup, block boundaries, and fine-detail loss become visible.
CheckSet it first at 100% view. Do not compensate excessive damage with Blend before Quality itself is in a useful range.
GEOMETRY · MACROBLOCK STRUCTURE
Tune block scale and shape separately
- Resolution
Controls the size of the macroblocking artifacts that appear. This is a spatial control: it changes block-structure scale rather than merely the overall wet/dry level.
CheckWatch diagonals, hard edges, and text. If a uniform “grid” becomes the dominant cue, return the scale to something more plausible for the shot.
- Block Aspect Ratio
Changes macroblocks from more square to more rectangular. It is a geometric change to the block pattern and is especially visible on UI, titles, diagonals, and fine lines.
CheckFor realistic simulation, start near a neutral shape. Reserve extreme stretching for deliberate glitch design.
FREQUENCY · EDGE CHARACTER / DIRECTION
Shape the frequency character after geometry
- Frequency Scale
The reference manual describes this control as sharpening the effect. It changes the frequency sharpness of the JPEG-like structure and therefore how aggressively boundaries and fine frequency artifacts read.
CheckAdjust it after Quality/Resolution. If increased sharpness starts reading as edge ringing, back it off instead of hiding the problem with Blend.
- Scale Component
Chooses which frequency components the effect is based on: All Frequencies, X-Frequency, or Y-Frequency. This makes breakup general, horizontally oriented, or vertically oriented.
CheckFor a conventional JPEG look, start with All Frequencies. Use X/Y only when a directional bias genuinely helps the shot or graphic design.
FINISH · WET / DRY
Use Blend only after the damage itself is right
- Global Blend
The final mix between the source image and the computed JPEG Damage result. It controls how dominant the already-built effect is but does not change its internal block/frequency structure.
CheckIf you have to reduce Blend heavily just to hide bad blocks, the problem is upstream — Quality, Resolution, Aspect, or Frequency.
Blackmagic’s manual describes JPEG Damage as a simulation of minor or major JPEG compression artifacts. It specifically defines Quality, Resolution, Block Aspect Ratio, Frequency Scale and the three Scale Component choices. Global Blend is the standard final OFX mix shown in the captured Inspector.
03A REPEATABLE COMPRESSION-DAMAGE WORKFLOW
Target → damage → blocks → frequency → motion QC → export.
This order keeps Global Blend from becoming a band-aid and makes each failure point readable.
Define the target first
Decide whether you are simulating believable recompression, a rough web look, or a directional glitch. That decision determines how far the later controls should be pushed.
This is an editorial workflow, not Blackmagic’s internal JPEG/OFX processing graph. It separates strength, block geometry, frequency character, mix, and delivery QC so a downstream Blend does not hide an upstream setup error.
Related reference: Fast Noise ↗ · Analog Damage ↗ · Texture Pop ↗
04FOUR REAL JPEG DAMAGE DECISIONS
Recompression, meme damage, directional glitch and UI texture need different priorities.
These are decision procedures rather than fixed presets; useful values depend on source detail, resolution, framing and the codec used at delivery.
Believable “recompressed several times” image
Create recognizable digital degradation without a decorative block grid.
- 01
Start with neutral Scale Component = All Frequencies.
- 02
Lower Quality until artifacts become visible in fine detail but do not yet dominate.
- 03
Set Resolution so macroblocks feel plausible for the intended delivery size.
- 04
Keep Block Aspect Ratio near neutral and use Frequency Scale moderately.
- 05
Check gradients, hair, text, and playback; use Global Blend last.
Aggressive web / meme compression look
Make damage obvious but controlled and clearly intentional.
- 01
Start with low Quality/strong damage so the character is obvious.
- 02
Increase visible block structure with Resolution while leaving Aspect alone at first.
- 03
If a graphic feel is desired, stretch Block Aspect Ratio slightly.
- 04
Tune Frequency Scale so edges do not turn into bright/dark ringing.
- 05
Evaluate titles and faces separately: the same setup can be far too harsh on skin.
Directional glitch with X/Y Frequency
Bias compression breakup along one axis without random “everything at once” damage.
- 01
Build a baseline damage look in All Frequencies.
- 02
Switch to X-Frequency and compare its horizontal bias with Y-Frequency.
- 03
Choose the direction that supports motion or graphic composition.
- 04
Tune Frequency Scale only after choosing the axis.
- 05
Make sure the directional artifact reads as deliberate rather than a resize/display error.
JPEG texture for titles and UI
Add digital grit while preserving readability of fine lines and text.
- 01
Work at final resolution rather than a reduced Viewer Fit.
- 02
Lower Quality only until the desired texture appears; do not sacrifice counters and thin strokes.
- 03
Judge Resolution/Aspect on vertical and diagonal letter strokes.
- 04
For stylized directionality, compare X/Y Frequency.
- 05
Make a representative delivery encode: a second compression pass can intensify the look beyond what the Viewer shows.
05CHOOSE THE RIGHT TEXTURE TOOL
Compression damage is not noise, grain, analog breakup or detail enhancement.
Choose by the image structure you are trying to create. JPEG Damage is the dedicated block/frequency option in this group.
| FX | When it fits |
|---|---|
| JPEG Damage | You need macroblocks, frequency breakup, and controlled digital compression degradation. |
| Fast Noise ↗ | You need a procedural field for texture, alpha, or warp rather than compression artifacts. |
| Analog Damage ↗ | You need broadcast/CRT/VHS/telecine analog-signal character. |
| Film Grain ↗ | You need photographic grain structure rather than block compression. |
| Texture Pop ↗ | You need to enhance or suppress local texture/detail without simulating codec damage. |
06READ THE ARTIFACT BEFORE MOVING A SLIDER
Grid, stretch, ringing, directional errors and export changes have different causes.
Fix the stage that created the artifact instead of immediately pulling Global Blend down.
01The whole frame has turned into a decorative block grid+
Likely cause: Damage is too strong and/or macroblock scale is too conspicuous for this resolution.
Fix: First return Quality to a more moderate level, then reduce block-geometry prominence with Resolution. Leave Blend for later.
02Artifacts look stretched rather than JPEG-like+
Likely cause: Block Aspect Ratio is too far from a neutral shape.
Fix: Bring Aspect closer to neutral. Use extreme values only for deliberate glitch work.
03Hard edges show unpleasant ringing+
Likely cause: Frequency Scale is too aggressive for the current Quality/Resolution.
Fix: Reduce Frequency Scale and re-check edge structure before touching Global Blend.
04The X/Y direction looks like an accidental resize error+
Likely cause: A directional Scale Component was chosen without a compositional reason or Frequency Scale is too strong.
Fix: Compare All Frequencies. If X/Y does not support motion, graphics, or a deliberate glitch, return to All.
05Text and UI lose readability before the background gets the desired look+
Likely cause: The same full-frame damage is too strong for high-contrast thin features.
Fix: Reduce Quality/Resolution, separate processing with a node/mask, or use a gentler Global Blend after the structure itself is correct.
06After export, damage looks much harsher than in the Viewer+
Likely cause: The delivery codec added a second layer of real compression on top of the stylized JPEG Damage.
Fix: Test a representative encode early. If needed, reduce the effect before render or use a gentler master codec before final delivery.
07BEFORE DELIVERY
Approve the blocks at 100%, then approve the codec on export.
Stylized compression is one of the few looks where the delivery codec can materially alter the aesthetic you approved in the Viewer.
08FAQ
Practical JPEG Damage questions.
How is Quality different from Resolution?
Quality sets the overall JPEG-like degradation level, while Resolution changes the scale of visible macroblock structure. One controls damage strength; the other controls spatial geometry.
What does Frequency Scale do?
The reference manual describes it as a control that sharpens the effect. In practice, tune it after Quality and block geometry while watching edge ringing and fine artifacts.
When should I use X-Frequency or Y-Frequency?
Use them for deliberately directional digital breakup. For conventional JPEG simulation, start with All Frequencies and treat X/Y as a design decision.
Can I just lower Global Blend if the effect is too strong?
Yes, but only after the internal damage structure is correct. If the problem is block size, aspect, or frequency ringing, Blend merely hides the wrong structure.
Why does JPEG Damage change after H.264/H.265 export?
Because the stylized damage then passes through a real delivery codec, which can add its own block/ringing artifacts. Always make a representative encode before final approval.
Sources and boundaries
Control behavior is anchored by the DaVinci Resolve 21/21.1 reference documentation and four native interface captures stored in the project. The live hero is an editorial teaching proxy and does not claim to reproduce Blackmagic’s JPEG simulation, DCT/quantization implementation, color transforms or exact slider curves.
Verify exact slider response and performance in the Resolve build you use. This page documents the visible controls and a repeatable decision workflow; it does not reverse-engineer the OFX implementation.