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<div class="title">IMWRITE Write Matrix to Image File </div> </div>
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<div class="textblock"><p>Section: <a class="el" href="sec_io.html">Input/Ouput Functions</a> </p>
<h1><a class="anchor" id="Usage"></a>
Usage</h1>
<p>Write the image data from the matrix into a given file. Note that FreeMat's support for <code>imwrite</code> is not complete. You can write images in the <code>jpg,png,xpm,ppm</code> and some other formats. The syntax for its use is </p>
<pre class="fragment"> 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)
</pre><p> where <code>filename</code> is the name of the file to write to. The input array <code>A</code> contains the image data (2D for gray or indexed, and 3D for color). If <code>A</code> is an integer array (int8, uint8, int16, uint16, int32, uint32), the values of its elements should be within 0-255. If <code>A</code> is a floating-point array (float or double), the value of its elements should be in the range [0,1]. <code>map</code> contains the colormap information (for indexed images), and <code>alpha</code> the alphamap (transparency). </p>
<h1><a class="anchor" id="Example"></a>
Example</h1>
<p>Here is a simple example of <code>imread</code>/<code>imwrite</code>. First, we generate a grayscale image and save it to an image file.</p>
<pre class="fragment">--> a = uint8(255*rand(64));
--> figure(1), image(a), colormap(gray)
--> title('image to save')
--> imwrite(a, 'test.bmp')
</pre><p>Then, we read image file and show it:</p>
<pre class="fragment">--> b = imread('test.bmp');
--> figure(2), image(b), colormap(gray)
--> title('loaded image')
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