IMWRITE Write Matrix to Image File
Section: Input/Ouput Functions
UsageWrite the image data from the matrix into a given file. Note that FreeMat's support for
imwriteis not complete. You can write images in the
jpg,png,xpm,ppmand some other formats. The syntax for its use is
imwrite(A, filename) imwrite(A, map, filename) imwrite(A, map, filename, 'Alpha', alpha) or Octave-style syntax: imwrite(filename, A) imwrite(filename, A, map) imwrite(filename, A, map, alpha)
filename is the name of the file to write to. The input array
A contains the image data (2D for gray or indexed, and 3D for color).
A is an integer array (int8, uint8, int16, uint16, int32, uint32),
the values of its elements should be within 0-255. If
A is a
floating-point array (float or double), the value of its elements should
be in the range [0,1].
map contains the colormap information
(for indexed images), and
alpha the alphamap (transparency).
ExampleHere is a simple example of
imwrite. First, we generate a grayscale image and save it to an image file.
--> a = uint8(255*rand(64)); --> figure(1), image(a), colormap(gray) --> title('image to save') Warning: Newly defined variable nargin shadows a function of the same name. Use clear nargin to recover access to the function --> imwrite(a, 'test.bmp')
Then, we read image file and show it:
--> b = imread('test.bmp'); --> figure(2), image(b), colormap(gray) --> title('loaded image') Warning: Newly defined variable nargin shadows a function of the same name. Use clear nargin to recover access to the function