2026 OpenClaw PNG QA in Production: Batch Transparency, Size Thresholds & Naming on Remote Mac

QA metric definitions (file size, transparency, dimensions)

Treat QA as a contract between design export and downstream systems. Write it once in a small config (YAML or JSON) and let every run compare the same numbers.

• File size (bytes): Set max_bytes per asset class. Example thresholds: icons and glyphs ≤ 150 KB, full-width web heroes at 2× under 1.5 MB, splash art under 4 MB. Log both raw size and dimensions so designers can see whether the problem is resolution or compression.
• Transparency / alpha: Decide whether each class must be straight alpha, must not carry alpha (flattened marketing stills), or must have a minimum usable transparent area (e.g. sticker cutouts). For transparent pixel checks, typical rules include: no more than 0.1% of pixels fully transparent inside the non-masked bounding box (stray holes), no semi-transparent “dust” below opacity 8/255 except within N px of edges, and mandatory alpha channel presence for UI overlays.
• Dimensions: Pin min_w, max_w, min_h, max_h, and optional modulo (e.g. width divisible by 8 for video overlays). Reject odd heights for certain ad slots. Pair with DPI only when print is in scope; for web, pixel dimensions matter more than DPI metadata.
• Naming: Enforce a single regex such as ^[a-z0-9]+(?:-[a-z0-9]+)*__w[0-9]+h[0-9]+\.png$ or your internal project_component_state.png pattern. Reject spaces, double extensions, and unexpected Unicode unless your CMS explicitly allows it.

OpenClaw task orchestration steps

OpenClaw fits best as the coordinator: it triggers shell skills, parses logs, and nudges humans only when automation stops. On a remote Mac, keep paths absolute and avoid iCloud-backed Desktop folders.

1. Stage inputs: Designers or CI copy PNGs into ~/qa_jobs/{job_id}/inbox/. Optionally use a watch folder (fswatch on macOS) to enqueue a job when the folder stabilizes (no new files for 30s).
2. Normalize: First step renames to a canonical scratch name if needed, verifies extension, and rejects non-PNG magic bytes.
3. Run validators: Invoke one script per concern (size, alpha, dimensions, name) or a single driver that reads the config. Each check exits non-zero with a machine-readable line: FAIL\talpha_dust\tfile.png.
4. Aggregate: OpenClaw (or a wrapper) merges results into report.json and decides pass/fail for the batch.
5. Notify: On fail, post the manifest path to Slack or email; on pass, move to pass/ and optionally upload to storage.

Watch-folder sketch: run a lightweight launcher under launchd or a tmux session so restarts survive SSH disconnects. The watcher should debounce bursts—export tools often write temporary files.

# Debounced watch (conceptual): when inbox is quiet, run the QA driver once
WATCH="$HOME/qa_jobs/demo/inbox"
fswatch -o "$WATCH" | while read; do
  sleep 30
  ~/bin/openclaw-qa-run.sh --job demo --config ~/qa/rules.yaml
done

Pair this flow with our watch-folder rename guide and Mac install & batch validation articles if you are still wiring the host.

Script templates and parameter examples

Below are copy-paste friendly templates. Install ImageMagick (brew install imagemagick) for fast alpha stats; use Pillow when you need pixel-precise rules in Python.

Bash: dimension + byte size gate

#!/usr/bin/env bash
set -euo pipefail
MAX_BYTES=1500000
MIN_W=64 MAX_W=4096
MIN_H=64 MAX_H=4096
for f in "$@"; do
  read -r w h < <(magick identify -format "%w %h" "$f")
  sz=$(stat -f%z "$f")
  [[ "$sz" -le "$MAX_BYTES" ]] || { echo "FAIL\tsize_bytes\t$f"; continue; }
  (( w >= MIN_W && w <= MAX_W && h >= MIN_H && h <= MAX_H )) || echo "FAIL\tdimensions\t$f"
done

Bash: require alpha channel (reject RGB-only when overlay is expected):

for f in "$@"; do
  magick identify -format "%[channels]" "$f" | grep -q alpha \
    || echo "FAIL\tmissing_alpha\t$f"
done

Python: rough “transparent pixel” ratio (tune THRESH; requires pillow):

#!/usr/bin/env python3
from PIL import Image
import sys
THRESH = 16  # min alpha (0-255) to count as "visible"
MAX_FRAC = 0.002  # max fraction fully transparent
for path in sys.argv[1:]:
    im = Image.open(path).convert("RGBA")
    a = im.split()[-1]
    transparent = sum(1 for p in a.getdata() if p < THRESH)
    frac = transparent / (im.width * im.height)
    if frac > MAX_FRAC:
        print(f"FAIL\ttransparent_ratio\t{path}\t{frac:.4f}")

Parameter examples you might encode in rules.yaml:

• icons: max_bytes: 120000, square: true, must_have_alpha: true, max_transparent_fraction: 0.0005
• hero_web: max_bytes: 1800000, width: [1920, 3840], height: [1080, 2160], must_have_alpha: false

Failed sample feedback and reruns

Scale only works if failures are boring to handle. Automate the paper trail.

• Move, don’t delete: On any FAIL, mv the PNG to failed/{job_id}/ and append one JSON line to failed/{job_id}/manifest.jsonl with path, rule, detail, and qa_rules_version.
• Human loop: Designers open the manifest, fix sources in Figma/Sketch/Affinity, re-export, and drop replacements into inbox/. Keep filenames stable so diffs are obvious.
• Rerun: Run the same OpenClaw job with --only failed_manifest.jsonl (your wrapper can read paths from the file). Clear rows from the manifest as they pass so the queue shrinks.
• Regression guard: Keep a golden/ folder of ten known-good PNGs and run QA against them on every deploy of the script. If golden fails, block the rollout.

Troubleshooting quick hits:

• False transparent failures: Export used premultiplied alpha or wrong color profile—re-export with straight alpha and embed sRGB if required.
• Spurious size spikes: Embedded thumbnails or huge metadata; strip with magick mogrify -strip in a separate optional step (only if your brand allows).
• Watcher fires too often: Increase debounce or ignore *.tmp / .DS_Store.
• SSH env differs: Run which magick and echo $PATH under non-interactive shells; set absolute paths in plist or systemd-style launch config.

FAQ

For related playbooks, see PNG auto-naming & batch validation, transparency checklist, and AI-assisted PNG processing. When you are ready to run long QA batches on dedicated hardware, open our in-site rental options and pricing—for a limited time you can browse plans and nodes without signing in, then follow the SSH/VNC setup guide to attach your remote Mac.