E-Factor — Case Study

Two Presses Passed.
The Customer Still Rejected the Job.

A real $1M customer loss — and how a single E-Factor number explained in 15 minutes what score-based systems couldn't.

83 / 84
Both plants passed (score)
7.4
Press-to-press E-Factor gap
<10%
Buyers accept at E-Factor 7+
$1M
Customer contract lost
15 min
ChromaChecker diagnosis
100+
Licenses now deployed
The Incident — Large Midwest Print Operation, 100+ Devices
Same Job. Two Sister Plants. Two Different Systems. Both Said “Pass.” The Customer Said Otherwise.

Plant 1 used ColorCert — score 83, G7 compliant. Plant 2 used MeasureColor — score 84, G7 compliant. Nothing flagged. Nothing raised concern. The customer called screaming: the job looked completely different between plants. Both vendors were contacted. Neither could explain the rejection. Then they called ChromaChecker.

The Core Problem

Why Scores Cannot Predict Rejection

Score-based systems measure each press against a reference — independently. They cannot answer the only question that matters to the customer: do the two prints match each other?

  Score-Based Systems — Each Press Measured in Isolation
Plant 1 · ColorCert
83
G7 Pass
vs. GRACoL
Reference
GRACoL
2013
Plant 2 · MeasureColor
84
G7 Pass
vs. GRACoL
Reference
GRACoL
2013
  No system compared Plant 1 directly to Plant 2 — the only comparison that matters to the customer
vs
  ChromaChecker — Presses Compared Directly to Each Other
E-Factor
Plant 1
5.3 EF
vs. GRACoL
Press-to-Press
7.4
E-Factor
Plant 2
5.4 EF
vs. GRACoL
Root cause
Magenta gap
Ink suppliers
2 different
Diagnosis time
15 minutes
  E-Factor 7.4 = statistically certain buyer rejection
Platform Comparison

What Each System Can — and Cannot — Tell You

Capability ColorCert MeasureColor ChromaChecker
Individual press vs. reference (G7, GRACoL, ISO)
Compare two presses directly to each other
Predict buyer rejection probability
Import any color bar or measurement format
Channel-level root cause identification
Multi-facility unified dashboard
Buyer Acceptance by E-Factor Range
0–3 EF
95%
95% accept
3–4 EF
83%
83% accept
4–6 EF
45%
45% accept
7.4 ▲
<10%
<10% accept
8–10 EF
3%
3% accept

▲ Actual press-to-press gap in this incident. At E-Factor 7.4, buyer rejection was statistically certain — regardless of G7 compliance status on both individual presses.

What ChromaChecker Found in 15 Minutes
  • 1
    Imported both measurement files — different color bars, different formats — into a single ChromaChecker session. No conversion or reformatting required.
  • 2
    Confirmed both presses were G7 compliant and close to GRACoL reference (5.3 and 5.4 EF respectively). Individual performance appeared entirely normal.
  • 3
    Compared both prints directly to each other. Press-to-press E-Factor: 7.4. The number that explained the rejection — invisible to score systems, computed in seconds by ChromaChecker.
  • 4
    Root cause isolated: magenta ink mismatch. One plant running light, one running heavy — two different ink suppliers compounding the gap across facilities.
“
ChromaChecker figured this all out within fifteen minutes. We would still be scratching our heads if we had not been introduced to ChromaChecker. This is a key example of why score-carding color control software programs do not always work.
— Color Manager, Large Midwest Print Operation (100+ devices)  ·  Now running 100+ ChromaChecker licenses across all facilities
The Core Difference
Score vs. E-Factor
A score measures each press against a reference — independently. E-Factor measures what the human eye sees when two prints are placed side by side. Scores cannot predict rejection. E-Factor can.
The Critical Gap
G7 ≠ Match
G7 compliance certifies each press against a reference condition. It does not certify that two G7-compliant presses will match each other. Only ChromaChecker's press-to-press E-Factor quantifies that gap — before the job ships.
The Outcome
100+ Licenses
After the incident, this operation replaced ColorCert and MeasureColor across their entire network — not as a supplement, as a replacement. 100+ ChromaChecker licenses now deployed across all facilities.

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Peter · AI Assistant
Questions about E-Factor or the difference between scores and E-Factor? I can explain.