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POJava: Line appears when using AffineTransform to scale image
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  1. POJava: Line appears when using AffineTransform to scale image
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    copied!<p>I'm having a problem with image scaling. When I use the following code to scale an image it ends up with a line either at the bottom or on the right side of the image.</p> <pre><code>double scale = 1; if (scaleHeight &gt;= scaleWidth) { scale = scaleWidth; } else { scale = scaleHeight; } AffineTransform af = new AffineTransform(); af.scale(scale, scale); AffineTransformOp operation = new AffineTransformOp(af, AffineTransformOp.TYPE_NEAREST_NEIGHBOR); BufferedImage bufferedThumb = operation.filter(img, null); </code></pre> <p>The original image </p> <p><img src="https://i.stack.imgur.com/LAEuk.gif" alt="enter image description here"> </p> <p>The scaled image</p> <p><img src="https://i.stack.imgur.com/3JIie.gif" alt="enter image description here"></p> <p>Does anyone know why the line appears?</p> <p>Thanks!</p> <p>EDIT:</p> <p>Added the complete method code:</p> <pre><code>public static final int SPINNER_MAX_WIDTH = 105; public static final int SPINNER_MAX_HEIGHT = 70; public void scaleImage(BufferedImage img, int maxWidth, int maxHeight, String fileName) { double scaleWidth = 1; double scaleHeight = 1; if (maxHeight != NOT_SET) { if (img.getHeight() &gt; maxHeight) { scaleHeight = (double) maxHeight / (double) img.getHeight(); } } if (maxWidth != NOT_SET) { if (img.getWidth() &gt; maxWidth) { scaleWidth = (double) maxWidth / (double) img.getWidth(); } } double scale = 1; if (scaleHeight &gt;= scaleWidth) { scale = scaleWidth; } else { scale = scaleHeight; } AffineTransform af = new AffineTransform(); af.scale(scale, scale); AffineTransformOp operation = new AffineTransformOp(af, AffineTransformOp.TYPE_NEAREST_NEIGHBOR); BufferedImage bufferedThumb = operation.filter(img, null); if (bufferedThumb != null) { File imageFile = new File(fileName); String fileType = fileName.substring(fileName.lastIndexOf(".") + 1); try { ImageIO.write(bufferedThumb, fileType, imageFile); } catch (IOException e) { logger.error("Failed to save scaled image: " + fileName + "\n" + e.getMessage()); } } } </code></pre> <p>The maxWidth and maxHeight parameters in the method call is set to the SPINNER_MAX_* constants.</p> <p>Thanks!</p>
 

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