---
name: "illumread"
section: "1"
platform: "linux"
package: "argyll"
version: "3.3.0+repack-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/illumread"
---

# illumread(1)

Measure an illuminant.

## NAME

Measure - Measure an illuminant.

## DESCRIPTION

Measure an illuminant

## SYNOPSIS

**illumread** \[-options\] output.sp

- **-v**

  Verbose mode

- **-S**

  Plot spectrum for each reading

- **-c** listno

  Choose instrument from the following list (default 1)

-

  \*\* No ports found \*\*

- **-N**

  Disable initial calibration of instrument if possible

- **-H**

  Use high resolution spectrum mode (if available)

- **-Y** r

  Set refresh measurement mode

- **-Y** R:rate

  Override measured refresh rate with rate Hz

- **-W** n\|h\|x

  Override serial port flow control: n = none, h = HW, x = Xon/Xoff

- **-D** \[level\]

  Print debug diagnostics to stderr

- illuminant.sp

  File to save measurement to