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# screenshot --mask: transparency outside target rects

Captures union bbox of multiple grap targets, applies 40% alpha outside individual target rects. PNG output with transparency. Evidence images that highlight specific UI nodes.

user/developer

## Steps

1. Capture union bbox of all grap targets (same...
2. LockBits BGRA pixel walk: pixels outside all...
3. Pixels inside any target rect stay fully opa...
4. AllowUnsafeBlocks required for LockBits perf...
5. Output: # SCREENSHOT path=... rect=L,T,R,B