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    <p>Here's a way to crop all 4 sides, using the color from the very top-left pixel as the baseline, and allow for a tolerance of color variation so that noise in the image won't make the crop useless</p> <pre><code>public BufferedImage getCroppedImage(BufferedImage source, double tolerance) { // Get our top-left pixel color as our "baseline" for cropping int baseColor = source.getRGB(0, 0); int width = source.getWidth(); int height = source.getHeight(); int topY = Integer.MAX_VALUE, topX = Integer.MAX_VALUE; int bottomY = -1, bottomX = -1; for(int y=0; y&lt;height; y++) { for(int x=0; x&lt;width; x++) { if (colorWithinTolerance(baseColor, source.getRGB(x, y), tolerance)) { if (x &lt; topX) topX = x; if (y &lt; topY) topY = y; if (x &gt; bottomX) bottomX = x; if (y &gt; bottomY) bottomY = y; } } } BufferedImage destination = new BufferedImage( (bottomX-topX+1), (bottomY-topY+1), BufferedImage.TYPE_INT_ARGB); destination.getGraphics().drawImage(source, 0, 0, destination.getWidth(), destination.getHeight(), topX, topY, bottomX, bottomY, null); return destination; } private boolean colorWithinTolerance(int a, int b, double tolerance) { int aAlpha = (int)((a &amp; 0xFF000000) &gt;&gt;&gt; 24); // Alpha level int aRed = (int)((a &amp; 0x00FF0000) &gt;&gt;&gt; 16); // Red level int aGreen = (int)((a &amp; 0x0000FF00) &gt;&gt;&gt; 8); // Green level int aBlue = (int)(a &amp; 0x000000FF); // Blue level int bAlpha = (int)((b &amp; 0xFF000000) &gt;&gt;&gt; 24); // Alpha level int bRed = (int)((b &amp; 0x00FF0000) &gt;&gt;&gt; 16); // Red level int bGreen = (int)((b &amp; 0x0000FF00) &gt;&gt;&gt; 8); // Green level int bBlue = (int)(b &amp; 0x000000FF); // Blue level double distance = Math.sqrt((aAlpha-bAlpha)*(aAlpha-bAlpha) + (aRed-bRed)*(aRed-bRed) + (aGreen-bGreen)*(aGreen-bGreen) + (aBlue-bBlue)*(aBlue-bBlue)); // 510.0 is the maximum distance between two colors // (0,0,0,0 -&gt; 255,255,255,255) double percentAway = distance / 510.0d; return (percentAway &gt; tolerance); } </code></pre>
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    1. POHow to auto crop an image white border in Java?
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    1. USTodd
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      1. VTUpMod
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    1. COPerfect! Thanks very much!
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    2. COwhat is this tolerence means?
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      1. USNishad K Ahamed
    3. COThe tolerance allows for images without a perfectly solid background color to still be cropped. For example, if you scan a drawing from a sheet of paper, the paper won't show up as an exact white, but rather will consist of a range of colors close to white. If you tried to crop just by matching one specific color of white, little (if anything) would be cropped. By allowing for some variation in the color of the background being cropped, it can remove all the unnecessary surrounding background and leave you with just the drawing.
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