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Images

Read, write, display, and modify images

MATLAB^® images are arrays of numeric data on which you can perform analysis. For more information, see Working with Images in MATLAB Graphics.

Functions

Display Image

`imshow`	Display image
`image`	Display image from array
`imagesc`	Display image with scaled colors

Read, Write, and Modify Image

`imread`	Read image from graphics file
`imresize`	Resize image
`imtile`	Combine multiple image frames into one rectangular tiled image
`imwrite`	Write image to graphics file
`imfinfo`	Information about graphics file
`imformats`	Manage image file format registry

Convert Image Type

`cmap2gray`	Convert RGB colormap to grayscale colormap
`frame2im`	Return image data associated with movie frame
`im2gray`	Convert RGB image to grayscale
`im2frame`	Convert image to movie frame
`im2java`	Convert image to Java image
`im2double`	Convert image to double precision
`ind2rgb`	Convert indexed image to RGB image
`rgb2gray`	Convert RGB image or colormap to grayscale
`rgb2ind`	Convert RGB image to indexed image
`getrangefromclass`	Default display range of image based on its class

Modify Image Colors

`imapprox`	Approximate indexed image by reducing number of colors
`dither`	Convert image, increasing apparent color resolution by dithering
`cmpermute`	Rearrange colors in colormap
`cmunique`	Eliminate duplicate colors in colormap; convert grayscale or truecolor image to indexed image

Properties

Image Properties

Image appearance and behavior

Topics

Working with Images in MATLAB Graphics

This section describes different data and image types and gives details about how to read, write, work with, and display graphics images.

Image Types

Types of images supported by MATLAB graphics.

Displaying Image Data

This example shows how to read an RGB image into the workspace and display it.

8-Bit and 16-Bit Images

Reduce memory requirements by storing images as 8-bit or 16-bit unsigned integers.

Read, Write, and Query Image Files

Work with standard image file formats in MATLAB, such as reading and writing image files.

Displaying Graphics Images

Display graphics file images and control the size and aspect ratio.

The Image Object and Its Properties

Like all graphics objects, the image object has a number of properties you can set to fine-tune its appearance on the screen.

Printing Images

Print images in proper proportions by preserving the aspect ratio.

Convert Image Graphic or Data Type

Converting between data types changes the interpretation of the image data.

MATLAB Documentation

Support

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