Argyll Environment Variables

Environment variables

ARGYLL_NOT_INTERACTIVE

ARGYLL_NOT_INTERACTIVE + + + + + + + +

X3DOM

.wrl

.x3d

.x3d.html

3d + + + + + + + + Viewing Format

@@ -97,6 +165,14 @@ a + + + + + + + + delay of 200 msec is allowed between changing a patch color in software, and that change appearing in the displayed color itself. For some instuments (ie. i1d3, i1pro, ColorMunki, Klein K10-A) @@ -116,6 +192,14 @@ environment + + + + + + + + variable, ie. ARGYLL_MIN_DISPLAY_UPDATE_DELAY_MS=400 would set a 400 msec minimum delay.

@@ -158,19 +242,19 @@ environment as being recommended practice in modelling chromatic adaption. The ICC profile format though, specifies the use of a non-cone space XYZ adaptation (so called "Wrong Von Kries" - chromatic adaptation) [ ICC Specification
- ICC.1:2001-04 (ICCV2.4) Annex A, pp 66, equations A.1, A.2 & - A.3 ], so ArgyllCMS profiles have a very slight incompatibility - with ICC profiles created strictly according to the ICC - specifications, depending on how close to white Output (i.e. - print) profiles media white is to the perfect diffuser. (Note that - CMM's that strictly follow the ICC specifications have much more - gross incompatibilities due to this, when dealing with the HP - & Microsoft sRGB and AdobeRGB profiles.) By setting this - environment variable, Output (i.e. print) profiles will be created - that better conform to the ICC specification, and therefore - have better inter-interoperability with some other CMMs, at the - cost of poorer color behavior.
+ chromatic adaptation) [ ICC Specification ICC.1:2001-04 (ICCV2.4) + Annex A, pp 66, equations A.1, A.2 & A.3 ], so ArgyllCMS + profiles have a very slight incompatibility with ICC profiles + created strictly according to the ICC specifications, depending on + how close to white Output (i.e. print) profiles media white is to + the perfect diffuser. (Note that CMM's that strictly follow the + ICC specifications have much more gross incompatibilities due to + this, when dealing with the HP & Microsoft sRGB and AdobeRGB + profiles.) By setting this environment variable, Output (i.e. + print) profiles will be created that better conform to the ICC + specification, and therefore have better + inter-interoperability with some other CMMs, at the cost of poorer + color behavior.
See also the ArgyllCMS 'arts' tag.
+
ARGYLL_CREATE_OUTPUT_PROFILE_WITH_CHAD
+ +

For Output type devices (i.e. Printers), the assumption + is that test patches are measured under D50 illuminant. It can be + very useful for proofing to calculate color corrections for other, + real world illuminants, and ArgyllCMS makes provision for this + with the coloprof -i parameter, or + the spec2cie -i parameter. To be + broadly useful, this change in illuminant needs to be available to + CMM's, which the ArgyllCMS's implementation makes possible by + incorporating the illuminant change into the absolute XYZ values + and hence the white point tag, so that Absolute Colorimetric + rendering intent returns XYZ values under that illuminant using + any CMM.
+
+ The ICC specification have provision for hiding this difference in + illuminant by chromatically transforming the absolute values to be + functionally equivalent to having been measured using a D50 + illuminant, and recording this transform in the ChromaticAdapation + ('chad') tag. This appears to motivated by the assumption that the + difference in illuminant is a quirk or limitation of the + instrument that is to be worked around, as well as the limitation + of the ICC Absolute to Relative chromatic transformation being + based on the inferior non-cone space XYZ adaptation (so called + "Wrong Von Kries" chromatic adaptation), while the + ChromaticAdapation tag allows for the use of a superior cone-space + based transformation. (see ARGYLL_CREATE_WRONG_VON_KRIES_OUTPUT_CLASS_REL_WP above + for more details.)
+
+ To + allow for strict conformance to the ICC specification when using + non-standard illuminants, setting the ARGYLL_CREATE_OUTPUT_PROFILE_WITH_CHAD + environment + variable causes a non-D50 illuminant white point change to be + hidden in the ChromaticAdapation Tag, and to still allow this to + be useful in a proofing situation, ArgyllCMS will incorporate the + effect of the ChromaticAdapation Tag when Absolute Colorimetric + Intent is chosen. Note that other CMM's may not do. For full + conformance with ICC specifications, the ARGYLL_CREATE_WRONG_VON_KRIES_OUTPUT_CLASS_REL_WP + variable would also be set, but neither of these options is + recommended, since ArgyllCMS's default behavior will give superior + results.
+

+ ARGYLL_CCAST_DEFAULT_RECEIVER

By default the ChromeCast test patch source uses a @@ -236,12 +429,27 @@ environment name="ARGYLL_DISABLE_I1PRO2_DRIVER">ARGYLL_DISABLE_I1PRO2_DRIVER

-
There is now support for most of the - the Eye-One Pro Rev E (aka Eye-One Pro 2) instrument features, but - a Rev E can be operated in legacy mode if the environment variable +
ArgyllCMS supports most of the the + Eye-One Pro Rev E (aka Eye-One Pro 2) instrument features, but a + Rev E can be operated in legacy mode if the environment variable ARGYLL_DISABLE_I1PRO2_DRIVER is set (ie. set it to "yes").
+

-
+ ARGYLL_XRGA
+
If the ARGYLL_XRGA + environment variable is set to:
+
+     XRGA, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to XRGA.
+     XRDI, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to XRDI.
+     GMDI, then all Getag-MacBeth/X-Rite + reflective measurements will be converted to GMDI.
+
+ If not set (or set to some other string), then the native + calibration will be used. Note that the values must be upper case.
+
XDG_CACHE_HOME

@@ -257,6 +465,14 @@ Base + + + + + + + + Directory Specification, and uses the XDG_CACHE_HOME environment variable to place per instrument calibration information, and -- cgit v1.2.3

Setting an environment variable

Environment variables
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Environment variables

Setting an environment variable

Environment variables -

Environment variables

Environment variables
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