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POHow to keep/favor certain pixel values when resizing a tall BufferedImage?
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  1. POHow to keep/favor certain pixel values when resizing a tall BufferedImage?
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    copied!<p>I have a BufferedImage which is quite tall (something like 1100 pixels height) and not especially wide (maybe 200-300 pixels). The image consists of a data plot, but most of the pixels represents a background color/value that's not really interesting. My problem is that when the image is resized from a height of 1100 px to something like 200-300 px, many of the pixels that actually contained interesting data is trashed by background color pixels. Is there any way to tell the Java 2D rescaling algorithms that I prefer pixels of certain values (or better, that I want to down-prioritize the background color) while rescaling? I use the following code snippet to rescale the image:</p> <pre><code>BufferedImage resized = new BufferedImage(width, height, imageType); Graphics2D graphics2D = resized.createGraphics(); graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); //Has worked best in my case graphics2D.drawImage(source, 0, 0, width, height, null); graphics2D.dispose(); </code></pre> <p>I'm sure that there's more effective ways of resizing images in Java, but that's not interesting (at least not for now).</p> <p>A kind of boring thing is that I used a library before (which will not be used anymore) that actually managed to keep much of the valuable data representing pixels.</p> <p>Note that I have the raw pixel data at hand (a 2D int array) if that is of any help. The application will handle many images of different sizes, so I don't know for sure that the height necessarily is 1100 pixels.</p> <p>Thanks.</p>
 

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