imfinfo

Gets information from the image, without reading pixel data, using functions defined in the omlimgtoolbox.

Syntax

R = imfinfo(file)

R = imfinfo(file, ext)

Inputs

file: Name of the image file.; Type: string
ext (optional): Specifies the extension to use for the image file to be read. If this option is used, file should be the base name with no extension specified.; Type: string

Outputs

R

The resulting structure with information about the image in file. R contains the following fields:

BitDepth: Bit depth of the image.
ByteOrder: Byte order stored. Values are big-endian if bytes are packed with the most significant first, little-endian otherwise, or undefined if it cannot be determined.
ColorType: Color type of the image. Values are grayscale for grayscale, indexed if an image indexes into a color map, and truecolor otherwise.
Comment: Text, if any, associated with the image.
Compression: Compression type, if available.
DelayTime: Delay in milliseconds before reading the next image for image formats that support animation.
DisposalMethod: Specifies how succeeding frames are rendered for image formats that support animation.
FileModDate: Last modification date of the image file on disk.
FileSize: Size of the image file on disk.
Filename: Absolute, normalized path to the image.
Format: Image type.
Height: Height of the image in pixels.
LoopCount: Number of loop iterations for an animation.
Quality: Quality of the image, with values from 0-100, 100 being the highest quality.
Width: Width of the image in pixels.

Type: struct

Examples

Obtain information on the image file:

addtoolbox('omlimgtoolbox')
info = imfinfo('img_4871.jpg');
info

info = struct [
BitDepth: 32
ByteOrder: undefined
ColorType: truecolor
Comment: 
Compression: undefined
DelayTime: 0
DisposalMethod: 
FileModDate: Tue Jul 11 09:16:24 2017
FileSize: 9055297
Filename: c:\tests\oml\img_4871.jpg
Format: JPEG
Height: 3096
LoopCount: 0
Quality: 99
Width: 3870
]