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POPrinting in Java - Printable.print() resizes images
 

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    <p>I have a custom report which draws via <code>Graphics2D</code>, and uses a lot of tiny <code>BufferedImage</code> sprites. <code>PrinterJob.print()</code> seems to be calling <code>Printable.print()</code> roughly once for each sprite (the actual count can vary both ways), so some pages are re-rendered 150 times... This causes printing to be unacceptably slow, about 10 seconds for two pages.</p> <p>I found this: <a href="https://stackoverflow.com/questions/1943556/why-does-the-java-printables-print-method-get-called-multiple-times-with-the-sa">Why does the java Printable&#39;s print method get called multiple times with the same page number?</a></p> <p>But it doesn't appear to explain my particular problem (or only partially explains it). I created a test report which has only a few sprites, and there was a small number of resizes that went up and down as I added and removed images on either the vertical or horizontal axes.</p> <p>When printing to a PDF using Bullzip, I noticed that after zooming in on the images, they are being scaled up using a bilinear or bicubic algorithm. One of these images, which is unique in having an indexed color palette, does not appear to be scaled. I confirmed that the scaling is a Java behavior and not being performed by Bullzip by printing to a real printer and observing the same images being scaled versus not.</p> <p>So it strikes me as the print API trying to rescale images to whatever DPI it has in mind, but for some reason it's calling <code>Printable.print()</code> each time it encounters an image that it deems as needing this treatment.</p> <p>How do I fix this behavior? I tried setting rendering hints on the <code>Graphics2D</code> that I get when <code>Printable.print()</code> is called, to no avail. I don't know what else to do short of try to find and examine the print API's source code.</p>
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