readRGBAImage

Read image using RGBA interface

Syntax

[RGB,alpha] = readRGBAImage(t)

Description

[RGB,alpha] = readRGBAImage(t) reads the image and alpha matting data from the TIFF file associated with the Tiff object t using the RGBA interface.

Examples

Get Image Data and Associated Alpha Matting

Get all image data and its associated alpha matting from a TIFF file.

Create a Tiff object for an image file.

t = Tiff('example.tif','r');

Read the image data and the associated alpha matting.

[RGB,A] = readRGBAImage(t);

Display the image.

imshow(RGB)

Close the Tiff object.

close(t);

Input Arguments

t — Tiff object

Tiff object

Tiff object representing a TIFF file. Use the Tiff function to create the object.

Output Arguments

RGB — Image data

numeric array

Image data, returned as a m-by-n-by-3 numeric array. Where m and n are the height and width of the image, respectively.

The readRGBAImage function can transform the pixel values based on specifications in these tags:

PhotometricInterpretation

BitsPerSample

SamplesPerPixel

Orientation

ExtraSamples

ColorMap

alpha — Alpha matting

numeric array

Alpha matting associated with the image, returned as an m-by-n numeric array. Where m and n are the height and width of the image, respectively.

If the image does not have associated alpha matting, then alpha is a matrix with all values set to 255 (transparent).

Algorithms

References

This function corresponds to the TIFFReadRGBAImage function in the LibTIFF C API. To use this function, you must be familiar with the TIFF specification and technical notes. View this documentation at LibTIFF - TIFF Library and Utilities.

Version History

Introduced in R2009b