Test 11 Overlay Comparison — Page 2

Gold Standard (green) vs Rollback Output (red) — all measurements in PDF px (800×534 canvas)

Boundary Comparison (PDF px, top-down)

Boundary	Gold Standard	Rollback Output	Delta (PDF px)	Delta (PS px)
Top visible text (Page 2)	69.0	70.0	+1.0	+4.1
Bottom visible text (Page 2)	398.8	396.0	-2.8	-11.8
Envelope height	329.8	326.0	-3.8	—

Scale factors

Photoshop → PDF X: ×0.24002

Photoshop → PDF Y: ×0.24000

Photoshop canvas: 3333 × 2225

PDF canvas: 800 × 534

Rollback engine constants (Page 2)

topMarginContinuation: pageH - 70 = 464 (pdf-lib Y)

→ top-down: 70 px

bottomMargin: 113 (pdf-lib Y hard stop)

Last drawable line: ≥ 113+25 = 138 (pdf-lib Y) → top-down ≤ 396 px

Visual Overlay — Page 2 Boundary Guide

Green dashed = Gold Standard approved boundaries | Red dashed = Rollback output boundaries | Orange dotted = Hard stop (bottomMargin=113) | Blue dashed = Page 2 start (topMarginContinuation)

Diagnosis

✅ Top boundary (Page 2 start)

Gold Standard: 69.0 px Rollback: 70.0 px Delta: +1.0 px

Within tolerance. topMarginContinuation = pageH - 70 matches the Gold Standard top boundary.

✅ Bottom boundary (last visible text line)

Gold Standard: 398.8 px Rollback: 396.0 px Delta: -2.8 px

Hard stop (bottomMargin=113) is at top-down px 421. Last drawable line baseline ≈ 396 px. Gold Standard last visible text ≈ 398.8 px. Within tolerance.

ℹ️ Implied Gold Standard bottomMargin

If the last visible text baseline in Test 11 was at top-down Y = 398.8 px, and lineHeight = 25px, then the hard stop (pdf-lib Y) must have been ≥ 398.8 px top-down, meaning bottomMargin ≥ 135px.

Current bottomMargin = 113 → last line ≈ 396 px top-down. Gold Standard bottom ≈ 398.8 px top-down.

To match the Gold Standard bottom boundary exactly, bottomMargin would need to be ≈ 135px (vs current 113px — a delta of 22px).

Note: This analysis is provided for informational purposes only. No code changes are made here.

Rollback PDF Artifact

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