我有一堆.jpg图片,想要将它们打印出来(使用墨水打印在纸上),并且指定固定的尺寸(以厘米为单位)。 假设image1.png是400x600像素,我希望将其以300 dpi的分辨率打印出来。 我尝试使用PrinterJob和Printable实现进行打印,但似乎无法指定dpi。 以下是代码片段:
PrinterJob job = PrinterJob.getPrinterJob();
job.setPrintable(new PrintableDeck(cardDB));
PrintRequestAttributeSet attr = new HashPrintRequestAttributeSet();
attr.add(new PrinterResolution(300, 300, PrinterResolution.DPI));
attr.add(new MediaPrintableArea(8,21,210-16,296-42,MediaPrintableArea.MM));
attr.add(MediaSizeName.ISO_A4);
attr.add(new Copies(1));
attr.add(OrientationRequested.PORTRAIT);
attr.add(PrintQuality.HIGH);
//attr.add(Fidelity.FIDELITY_TRUE);
job.print(attr);
并且
public class PrintableDeck implements Printable {
BufferedImage image;
public PrintableDeck(DB cardDB){
// This load an image into 'image'
BufferedImage image = cardDB.getCard(5462).getBufferedImage();
}
public int print(Graphics graphics, PageFormat pf, int page)
throws PrinterException{
if(page>0){
return NO_SUCH_PAGE;
}
Graphics2D g2 = (Graphics2D) graphics;
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
double pageHeight = pf.getImageableHeight();
double pageWidth = pf.getImageableWidth();
// This print ONLY ~596x842, as if page is 72 DPI
System.out.println("Imageable WH: "+pageWidth+" x "+pageHeight);
// This print correctly 400x600
System.out.println("Image: "+images.get(0).getWidth(null)+" x "+images.get(0).getHeight(null));
g2.drawImage(image, 0, 0, null);
g2.dispose();
return PAGE_EXISTS;
}
}
如上所示,我使用了PageFormat.getImageableHeight() ~ 842和PageFormat.getImageableWidth() ~ 595。如果页面是300 DPI,我期望这些值会更高,大约是3000 x 2500。
我错过了什么吗?
非常感谢。