Re: [JAVA2D] drawimage on a bilevel image does not work
I am trying to add one image above another image. And tried alpha from 0 to 1, they all did not work. So what's right way to do this? [Message sent by forum member 'jiezhang' (jiezhang)] http://forums.java.net/jive/thread.jspa?messageID=291351 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help.
Re: [JAVA2D] drawimage on a bilevel image does not work
Hi, You can't do an alpha-blended composition of two bi-level images, as a bilevel image has only two levels, either completely white or completely black. So you first have to create a new temporary true color BufferedImage (any of the TYPE_INT_RGB or TYPE_3/4BYTE_RGB/BGR will probably do fine), and then draw both your images into that. Use alpha only for the second image. Good luck! ;-) -- Harald K On 4. aug.. 2008, at 17.50, [EMAIL PROTECTED] wrote: I am trying to add one image above another image. And tried alpha from 0 to 1, they all did not work. So what's right way to do this? [Message sent by forum member 'jiezhang' (jiezhang)] http://forums.java.net/jive/thread.jspa?messageID=291351 = = = = = == To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help. === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help.
Re: [JAVA2D] drawimage on a bilevel image does not work
That way should work. Another way to make it work is converting the first one to gray image and draw the second on it. But I am hoping to get thing done without introducing the third image or doing a content conversion. [Message sent by forum member 'jiezhang' (jiezhang)] http://forums.java.net/jive/thread.jspa?messageID=291369 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help.
Re: [JAVA2D] drawimage on a bilevel image does not work
Have you tried without extra alpha? Just with the default SrcOver compositing mode? Thanks, Dmitri [EMAIL PROTECTED] wrote: I am trying to add one image above another image. And tried alpha from 0 to 1, they all did not work. So what's right way to do this? [Message sent by forum member 'jiezhang' (jiezhang)] http://forums.java.net/jive/thread.jspa?messageID=291351 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help. === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help.
Re: [JAVA2D] drawimage on a bilevel image does not work
Not quite sure what you expected. If you're compositing two 1-bit images with .4 extra alpha, you'll pretty much get 0 in the result since extra alpha is shifting all colors towards index 0 which is black by default. Dmitri [Message sent by forum member 'trembovetski' (trembovetski)] http://forums.java.net/jive/thread.jspa?messageID=291165 === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help.
Re: [JAVA2D] drawimage on a bilevel image does not work
[EMAIL PROTECTED] wrote: I am using drawimage method to add a BufferedImage to another BufferedImage. The base image is a bilevel (white and black) and the added image is bilevel too. But in result, the added image just became a black frame in base image. Anyone has an idea? Please post a test reproducing the issue. Thanks, Dmitri === To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message signoff JAVA2D-INTEREST. For general help, send email to [EMAIL PROTECTED] and include in the body of the message help.
Re: [JAVA2D] drawimage on a bilevel image does not work
This is source code. How do I give images.
import java.awt.image.BufferedImage;
import java.awt.Graphics2D;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.RenderingHints;
import java.awt.FontMetrics;
import java.awt.geom.Rectangle2D;
import java.awt.GraphicsEnvironment;
import java.util.Iterator;
import java.io.File;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriter;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageWriteParam;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.IIOImage;
public class Testdraw {
public static void main(String [] args) {
String inputFileName = /tmp/tkidifx3.tif;
String addedFileName = /tmp/tkidiw33g.tif;
String outputFileName = /tmp/tkidifx3w.tif;
String outputFormat = tif;
try {
BufferedImage img = ImageIO.read((new File(inputFileName)));
BufferedImage added_image = ImageIO.read((new File(addedFileName)));
Graphics2D g2d = (Graphics2D) img.getGraphics();
//Create an alpha composite of 40%
float opacity = 0.4f;
AlphaComposite alpha =
AlphaComposite.getInstance(AlphaComposite.SRC_OVER, opacity);
g2d.setComposite(alpha);
g2d.drawImage(added_image, 200, 200, null);
g2d.dispose();
Iterator writers =
ImageIO.getImageWritersByFormatName(outputFormat);
ImageWriter writer = null;
while(writers.hasNext()) {
writer = (ImageWriter)writers.next();
if(writer.getClass().getName().startsWith(com.sun)) {
// Break on finding the core provider.
break;
}
}
if(writer == null) {
throw new Exception(Cannot find core +
outputFormat.toUpperCase() + writer!);
}
File f = new File(outputFileName);
ImageOutputStream ios = ImageIO.createImageOutputStream(f);
writer.setOutput(ios);
ImageWriteParam wp = writer.getDefaultWriteParam();
writer.write(null,new IIOImage(img, null, null),wp);
ios.close();
} catch (Throwable t) {
t.printStackTrace();
}
}
}
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