iccread

Read ICC profile

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Syntax

profile = iccread(filename)

Description

example

profile = iccread(filename) reads the International Color Consortium (ICC) color profile data from the file specified by the input filename.

Note

iccread can read profiles that conform with either Version 2 (ICC.1:2001-04) or Version 4 (ICC.1:2001-12) of the ICC specification. For more information about ICC profiles, visit the ICC website, http://www.color.org.

Examples

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Open Live Script

Read the International Color Consortium (ICC) profile that describes a typical PC computer monitor.

profile = iccread('sRGB.icm')
profile = struct with fields:
               Header: [1x1 struct]
             TagTable: {17x3 cell}
            Copyright: 'Copyright (c) 1999 Hewlett-Packard Company'
          Description: [1x1 struct]
      MediaWhitePoint: [0.9505 1 1.0891]
      MediaBlackPoint: [0 0 0]
        DeviceMfgDesc: [1x1 struct]
      DeviceModelDesc: [1x1 struct]
      ViewingCondDesc: [1x1 struct]
    ViewingConditions: [1x1 struct]
            Luminance: [76.0365 80 87.1246]
          Measurement: [1x1 struct]
           Technology: 'Cathode Ray Tube Display'
               MatTRC: [1x1 struct]
          PrivateTags: {}
             Filename: 'sRGB.icm'

Determine the source color space. The profile header provides general information about the profile, such as its class, color space, and PCS.

profile.Header.ColorSpace
ans = 
'RGB'

Input Arguments

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Name of the file containing ICC profile, specified as a character vector or string scalar. The file can be either an ICC profile file or a TIFF file containing an embedded ICC profile. To determine if a TIFF file contains an embedded ICC profile, use the imfinfo function to get information about the file and look for the ICCProfileOffset field in the output.

Note

If you specify only the file name without its path, iccread searches for the file in the current folder, a folder on the MATLAB®path, or in the folder returned by iccroot in that order.

Data Types: char | string

Output Arguments

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ICC profile data, returned as a structure array. The fields contain the data structures (called tags) defined in the ICC specification. The number of fields in profile depends on the profile class and the choices made by the profile creator. iccread returns all the tags for a given profile, both public and private. Private tags and certain public tags are left as encoded uint8 data. The following table lists fields that are found in any profile structure generated by iccread.

Field

Data Type

Description

Header

1-by-1 struct array

Profile header fields.

TagTable

n-by-3 cell array

Profile tag table.

Copyright

Character vector

Profile copyright notice.

Description

1-by-1 struct array

Profile description. The String field in this structure contains a character vector describing the profile.

MediaWhitePoint

double array

XYZ stimulus values of the device's media white point.

PrivateTags

m-by-2 cell array

Contents of all the private tags or tags not defined in the ICC specifications. The tag signatures are in the first column, and the contents of the tags are in the second column. The iccread leaves the contents of these tags in unsigned 8-bit encoding.

Filename

Character vector

Name of the file containing the profile.

Also, profile might contain one or more of the following transforms:

  • Three-component, matrix-based transform: A simple transform that is often used to transform between the RGB and XYZ color spaces. If this transform is present, profile contains a field called MatTRC.

  • N-component look-up-table (LUT) based transform: A transform that is used for transforming between color spaces that have a more complex relationship. This type of transform is found in any of the following fields in profile:

    AToB0

    BToA0

    Preview0

    AToB1

    BToA1

    Preview1

    AToB2

    BToA2

    Preview2

    AToB3

    BToA3

    Gamut

Data Types: struct

Tips

  • ICC profiles provide color management systems with the information necessary to convert color data between native device color spaces and device-independent color spaces, called the Profile Connection Space (PCS). You can use the profile as the source or destination profile with the makecform or applycform functions to compute color space transformations.

See Also

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Introduced before R2006a

Image Processing Toolbox Documentation

Support