LabProbe by GCRflow

Print color inverse guidance and pressroom tracking

LabProbe is a bilingual browser-based tool for prepress operators, pressroom teams, and color technicians who need to compare a measured color with a target, estimate a practical CMYK file adjustment, and keep a traceable multi-round job record.

Available for calibrated digital-proof workflows. Delta E calculation works with comparable measurement conditions. CMYK inverse guidance uses the selected device template or the system default; accuracy depends on the actual device, media, RIP condition, and measurement workflow, so final measurements remain required.

What LabProbe does

CIELAB comparisonAccepts measured and target L*, a*, b* values, shows connected sRGB previews, and calculates color difference.

Four ΔE formulasSupports CIEDE2000, CMC 2:1, CIE76, and CIE94 for comparison and workflow preference.

Calibrated CMYK guidanceUses current CMYK percentages with measured and target Lab values to suggest file-percentage changes and a proposed CMYK result. The solver can use a device-specific TC1617/P2P template or the system digital-proof default.

Digital-proof calibration labAccepts CGATS, TI3, IT8, TXT, CSV, or TSV files with Lab or XYZ data. It auto-detects TC1617 and P2P51 layouts across supported i1 and Barbieri exports, combines repeated scans, and saves private device templates. TC1617 builds the full baseline; P2P51 can update a matched full baseline as a maintenance layer.

Per-channel controlLets the operator lock or open C, M, Y, and K independently before solving.

Process selectionProvides unlaminated, gloss-laminate, and matte-laminate workflow choices.

GCR advisoryCan present a four-channel gray-replacement suggestion and estimated ink-saving context when the current values support it.

Instrument-screen OCRReads L*, a*, b* values from a captured instrument LCD image. Recognition runs on the device and the image is not uploaded by the OCR workflow.

Jobs and pressesOrganizes work by account, press, job number, process, target, and measurement state.

Closed-loop roundsSaves intermediate rounds without changing the job number, supports continuing a previous job, and records final verification.

Private cloud historySigned-in users can synchronize press profiles, inverse-solve records, closed-loop progress, and job details.

Mobile PWACan be added to a phone home screen. The application shell has an offline fallback; server-based solving and cloud synchronization require a network connection.

Operational settingsIncludes theme and default-formula preferences, service diagnostics, feedback, cache controls, and deliberately protected history deletion.

Typical workflow

Enter the current CMYK percentages or start with the clearly marked demo values.
Enter or scan the measured and target Lab values.
Select the process and ΔE formula, then lock any CMYK channels that must not change.
Run an inverse solve and review the suggested file-percentage changes and predicted ΔE00.
For production records, sign in, select a press, save the round, continue remeasurement as needed, and complete final verification.

Important boundaries

LabProbe is a decision-support tool, not a measuring instrument and not an automatic press controller. It does not replace a spectrophotometer, a calibrated production workflow, pressroom judgment, proofing, or final visual and numerical verification. CMYK and GCR outputs are adjustment guidance and must be checked against the real substrate, ink, press condition, process, and production constraints.

The current system default is a historical M1 TC1617 digital-proof data set and is only a starting point. A TC1617 or matched P2P51 maintenance template is marked ready after structural checks, not after an accuracy certification. Independent verification prints and closed-loop measurements remain required.

Language and access

The interface automatically uses Chinese when the browser’s primary language is Chinese; every other primary language receives English. A manual English/Chinese switch is available and the selection is remembered on that device. The application is available at lab.gcrflow.com.

中文说明

LabProbe 是什么

LabProbe 是一款面向印前、印刷现场和色彩技术人员的浏览器工具。它把当前 CMYK 百分比、实测 Lab 和目标 Lab 组合起来，计算色差并给出文件百分比调整建议，同时把多轮追色过程保存为可继续的工单记录。

已开放用于经过校准的数码样追色流程。相同测量条件下可直接计算色差；CMYK 反求可使用当前设备模板或系统数码样默认模板。准确度仍取决于实际设备、纸张、RIP 和测量流程，最终结果必须以复测数据验收。

主要能力

实测与目标 CIELAB 对比、相连色块预览，以及 CIEDE2000、CMC 2:1、CIE76、CIE94 四种色差公式。
CMYK 文件调整建议、C/M/Y/K 独立锁定、本底/光膜/哑膜工艺选择，以及条件允许时的 GCR 灰替参考。
数码样设备校准：识别包含 Lab 或 XYZ 的 CGATS、TI3、IT8、TXT、CSV、TSV 文件，自动匹配 TC1617 / P2P51、横竖版及支持的 i1 与 Barbieri 导出顺序，合并重复扫描并保存账户私有模板；TC1617 建完整基础，P2P51 可在匹配完整基础后生成维护层。
通过拍照读取仪器 LCD 屏幕上的 L*、a*、b*；OCR 在本机运行，识别流程不上传照片。
账户、机台、工单号、分轮保存、闭环复测、最终验收、历史详情与继续调试。
手机主屏幕 PWA、主题和默认公式偏好、服务诊断、反馈、缓存管理与深层保护的历史删除。

能力边界

LabProbe 不是测量仪器，也不会自动控制印刷机。它不能替代分光仪、校准后的生产流程、打样、现场经验和最终验收。没有启用 TC1617 用户模板或已验证系统基线时，默认 CMYK 反求与 GCR 输出仍属于未经具体设备校准的方向性建议，必须结合真实承印物、油墨、机台状态和生产约束验证。

当前系统默认使用历史 M1 TC1617 数码样数据，只作为没有个人数据时的起点。TC1617 或已匹配基础模板的 P2P51 维护层显示“可启用”，只代表结构检查通过，不代表已经证明生产精度；仍需独立复测色块和闭环工单验证。