Hi,
I recently experimented a little with transparent colors and I ran into a
very strange
behaviour: as soon as I use a color with alpha on a page, all other colors
appear
not in the intended way anymore. I created a demo class to show the effect
(see below).
On page one, where I don't have any transparent color, all colors look
correct. On
page two, the magenta and the cyan suddenly look very grayish, which seems
to be caused by the color with alpha.
Is that a bug in itext or am I just doing something wrong?
Thanks in advance for any hints on how to deal with this...
Cheers,
Jonas
--------------------------------------------- snip
-----------------------------------------------------------
public class ColorsWithAlphaTest {
/**
* @param args
*/
public static void main(String[] args) {
try {
Document document = new Document(PageSize.A4.rotate());
OutputStream out = new FileOutputStream("c:/tmp/test.pdf");
PdfWriter writer = PdfWriter.getInstance(document, out);
document.open();
document
.add(new Phrase("Page without transparency: colors look
correct"));
document.add(getSquare(writer, Color.magenta));
document.add(getSquare(writer, Color.cyan));
document.add(getSquare(writer, new Color(75, 75, 75))); // color
without
// alpha!
document.newPage();
document.add(new Phrase(
"Page with alpha somewhere: colors look bad"));
document.add(getSquare(writer, Color.magenta));
document.add(getSquare(writer, Color.cyan));
document.add(getSquare(writer, new Color(75, 75, 75, 75))); // color
with
// alpha!
document.close();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
private static Image getSquare(PdfWriter writer, Color c)
throws BadElementException {
int width = 15;
int height = 15;
final PdfContentByte cb = writer.getDirectContent();
cb.saveState();
PdfTemplate tp = cb.createTemplate(width, height);
Graphics2D g2 = tp.createGraphics(width, height);
g2.setColor(c);
g2.fillRect(0, 0, width, height);
g2.dispose();
cb.restoreState();
return Image.getInstance(tp);
}
}
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