imread

Read image from graphics file.

Syntax

• A = imread(filename)

• [A, map] = imread(filename)

• [A, map, transparency] = imread(filename)

Input argument

• filename - a row vector characters or scalar string: name of graphics file.

Output argument

• A - Image data: array.

• map - Colormap: m-by-3 matrix.

• transparency - Transparency information: matrix.

Description

imread reads the image data from the given file into a matrix.

Format	Description
BMP	Windows Bitmap
GIF	Graphic Interchange Format (optional)
JPG	Joint Photographic Experts Group
TIFF	Tagged Image File Format
JPEG	Joint Photographic Experts Group
PCX	PiCture eXchange
PNG	Portable Network Graphics
PBM	Portable Bitmap
PGM	Portable Graymap
PPM	Portable Pixmap
XBM	X11 Bitmap
XPM	X11 Pixmap

Example

f = figure();
filename = [tempdir, 'ngc6543a.gif'];
websave(filename, 'https://solarviews.com/raw/ds/ngc6543a.gif');
img = imread(filename);
imagesc(img);

See also

imagesc, imformats.

History

Version	Description
1.0.0	initial version
1.13.0	pcx, tiff formats added

Author

Allan CORNET