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    <p>Make sure you are using the correct color model for reading and writing.</p> <p>According to the <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/image/BufferedImage.html#getRGB%28int,%20int,%20int,%20int,%20int%5B%5D,%20int,%20int%29" rel="nofollow">BufferedImage.getRGB() documentation</a>, </p> <blockquote> <p>Returns an array of integer pixels in the default RGB color model (TYPE_INT_ARGB) and default sRGB color space, from a portion of the image data. Color conversion takes place if the default model does not match the image ColorModel. There are only 8-bits of precision for each color component in the returned data when using this method. With a specified coordinate (x, y) in the image, the ARGB pixel can be accessed in this way:</p> </blockquote> <pre><code>pixel = rgbArray[offset + (y-startY)*scansize + (x-startX)]; </code></pre> <p><strong>[Edit]</strong></p> <p>You need to use the constructor <code>BufferedImage(width, height, type, ColorModel)</code>, as indicated in the <a href="http://docs.oracle.com/javase/7/docs/api/java/awt/image/BufferedImage.html#TYPE_BYTE_BINARY" rel="nofollow">Javadoc for your image type</a> (<code>TYPE_BYTE_BINARY</code>):</p> <blockquote> <p>When this type is used as the imageType argument to the BufferedImage constructor that takes an imageType argument but <strong>no ColorModel argument, a 1-bit image is created</strong> with an IndexColorModel with two colors in the default sRGB ColorSpace: {0, 0, 0} and {255, 255, 255}.</p> <p>Images with 2 or 4 bits per pixel may be constructed via the <strong>BufferedImage constructor that takes a ColorModel argument</strong> by supplying a ColorModel with an appropriate map size.</p> </blockquote> <p>(emphasis mine)</p>
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    1. POWhy ImageIO.write() method modifies pixel values?
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    1. COIsn't img.getType() in line: BufferedImage destImg = new BufferedImage(img.getWidth(), img.getHeight(), img.getType()); assuring me that I have the same ColorModel for both BufferedImages ? Or is it the fact that I need to somehow etract the ColorModel from the actual file on the disk ? If so coul I o this ?
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      1. USAlexandru Marian Obaj
    2. COYou might verify that their color models are the same using `getColorModel()` on the one read from disk and the one you created. Its possible that the images are the same visually with a different pixel arrangement or color model in code.
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    3. COUnfortunately the ColorModdel is the same across all 3 BufferedImage's. But thanks for all the help so far guys. If you manage to find something out please help. Hint : Try using several png images to see what happens (sometimes it works other times it totally fails)
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