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Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
Reference Guide for OpenMatrix Language Functions
The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
Image Commands
isgray
Returns true if the given image, x, is grayscale.

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Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
- Scripting Guide for OpenMatrix Language
  OpenMatrix is a mathematical scripting language.
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
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  - Image Commands
    - fspecial
      Creates a filter that can be used for image processing.
    - imadd
      Utility function for images which adds a matrix or a constant to a given matrix, x.
    - image
      Display a matrix as an image, based on the current color map.
    - imagesc
      Display a matrix as an image with scaled colors.
    - imattributes
      Gets information about an image from its handle using functions defined in the omlimgtoolbox.
    - imfilter
      Applies a linear filter on image data.
    - imfinfo
      Gets information from the image, without reading pixel data, using functions defined in the omlimgtoolbox.
    - imread
      Reads an image with the pixel data stored in a matrix R, with functions defined in the omlimgtoolbox.
    - imshow
      Displays an image file in a figure.
    - imsubtract
      Utility function for images which subtracts a matrix or a constant from a given matrix, x.
    - imwrite
      Writes an image, whose pixel data comes from a matrix, m, with functions defined in the omlimgtoolbox.
    - isbw
      Returns true if the given image, x, has only black and white colors.
    - isgray
      Returns true if the given image, x, is grayscale.
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- Python in Compose Reference Guide
Appendix
Get help for the optional libraries that are available in the Extension Manager.
Frequently Asked Questions
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isgray

Returns true if the given image, x, is grayscale.

Syntax

R = isgray(x)

Inputs

x: Name of the image file, 2D or ND non-sparse matrix.; Type: string | mat

Outputs

R: Returns true if x is grayscale and false otherwise.; Type: logical

Examples

Checks if an image file is grayscale:

R = isgray('test.bmp')

R = 1