How to resize barcode generated by barbecue api? - java

I have generated the barcode using barbecue and now I want to resize the barcode as per my need. I tried with BufferedImage and then I got barcode with different size but then I get an additional black line under the barcode.
public class GenerateBarcode {
public static void main(String[] args) throws Exception {
String initialString = JOptionPane.showInputDialog("Enter the text here");
Barcode barcode = BarcodeFactory.createCode128(initialString);
BufferedImage bi = BarcodeImageHandler.getImage(barcode);
}
}
Here I want to resize "bi".

To resize any BufferedImage, you can create a new one and draw your old one on top of it with a scaling applied. For example:
double scale = 2;
BufferedImage scaledBi = new BufferedImage((int)(bi.getWidth()*scale), (int) (bi.getHeight()*scale), bi.getType());
Graphics2D g2 = scaledBi.createGraphics();
g2.drawImage(bi, 0, 0, scaledBi.getWidth(), scaledBi.getHeight(), 0, 0, bi.getWidth(), bi.getHeight(), null);
scaledBi now contains your scaled image. Note that this is not vector based, so I am not sure of the quality. To increase scaling quality, you can play with the rendering hints.

Try this code:
Barcode b = BarcodeFactory.create2of7(jTextField1.getText());
b.setBarHeight(5);
b.setBarWidth(1);

Related

How to place two images in one canvas through java (not jframe)

I just want to place two different images on one canvas and make it a .jpg file in Java. I just want to make a resulting file, not a GUI.
I want to make a result file like below with both images above:
You can use BufferedImage to combine the two images. The following code shows a simple implementation:
public static void combineImages(String imagePath1, String imagePath2, String outputPath) throws IOException {
int intervalWidth = 20; // The interval between two images
BufferedImage image1 = ImageIO.read(new File(imagePath1));
BufferedImage image2 = ImageIO.read(new File(imagePath2));
int combinedWidth = image1.getWidth() + image2.getWidth() + intervalWidth;
int combinedHeight = Math.max(image1.getHeight(), image2.getHeight());
BufferedImage combined = new BufferedImage(combinedWidth, combinedHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g = combined.createGraphics();
g.setColor(Color.WHITE);
// Fill the background with white
g.fillRect(0, 0, combinedWidth, combinedHeight);
// Draw the two images on the combined image
g.drawImage(image1, 0, 0, null);
g.drawImage(image2, image1.getWidth() + intervalWidth, 0, null);
ImageIO.write(combined, "jpg", new File(outputPath));
}

Java 2D PNG: Calculate Dimension

I want to create a PNG Image with Java. In this image I want to show some random Text.
Normaly I would create a picture like this:
BufferedImage bi = new BufferedImage(300,300,BufferedImage.TYPE_INT_ARGB);
bi.getGraphics().drawString("Hello world", 0, 0);
ImageIO.write(bi, "png", File.createTempFile("out", ".png"));
I know that I can calculate the String length with the following code:
bi.getGraphics().getFontMetrics().stringWidth("Hello world");
But to execute this, I need a Graphics Object (which I grab from the BufferedImage). So I must declare BufferedImage before I can use stringWidth.
The result is, that the image is much bigger than needed.
The only way I see is to create a "dummy BufferedImage". So I can calculate the needed width & height and after that I can create a BufferedImage that fit.
I can't find a better solution, but maybe someone can help me.
Thanks a lot.
Sorry, in a hurry, but consider this test:
public static void main(String[] args) {
Font font = Font.decode(Font.MONOSPACED);
Rectangle2D bounds;
String str = "Hello World";
BufferedImage dummy = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
FontRenderContext context = new FontRenderContext(new AffineTransform(), true, true);
bounds = font.getStringBounds(str, context);
System.err.println("bounds: " + bounds);
bounds = font.getStringBounds(str, dummy.createGraphics().getFontRenderContext());
System.err.println("bounds: " + bounds);
Graphics2D graphics = dummy.createGraphics();
FontMetrics fontMetrics = graphics.getFontMetrics(font);
bounds = fontMetrics.getStringBounds(str, graphics);
System.err.println("bounds: " + bounds);
}
Output:
bounds: java.awt.geom.Rectangle2D$Float[x=0.0,y=-12.064453,w=79.21289,h=15.667969]
bounds: java.awt.geom.Rectangle2D$Float[x=0.0,y=-12.064453,w=77.0,h=15.667969]
bounds: java.awt.geom.Rectangle2D$Float[x=0.0,y=-12.064453,w=77.0,h=15.667969]
So it seems that just creating a dummy is most likely to get the desired result (the docs also states that creating a FontRenderContext might give unexpected/undefined results).

Generate thumbnail and fill empty space with color

Is it possible to implement the first example with Scalr?
My code is the following:
BufferedImage thumbnail = Scalr.resize(ImageIO.read(sourceFile), Scalr.Method.ULTRA_QUALITY, Scalr.Mode.FIT_TO_WIDTH,
width, height, Scalr.OP_ANTIALIAS);
ImageIO.write(thumbnail, destinationfile.getExtension(), destinationfile);
What I want is to receive the image like this:
where the blue bars are the space I want to fill with the color.
Thank you
Update: maybe it is possible to implement with Thumbnailator?
Just done! Perhaps it can help you!
public static BufferedImage resizeAndCrop(BufferedImage bufferedImage) throws IOException {
int himg = bufferedImage.getHeight();
int wimg = bufferedImage.getWidth();
double rateh = himg/dim;
double ratew = wimg/dim;
double rate = ratew;
if(rateh>ratew)
rate = rateh;
int dimhimg = (int) (himg/rate);
int dimwimg = (int) (wimg/rate);
double startw = dim/2 - dimwimg/2;
double starth = dim/2 - dimhimg/2;
BufferedImage tThumbImage = new BufferedImage( dim, dim, BufferedImage.TYPE_INT_RGB );
Graphics2D tGraphics2D = tThumbImage.createGraphics(); //create a graphics object to paint to
tGraphics2D.setBackground( Color.WHITE );
tGraphics2D.setPaint( Color.WHITE );
tGraphics2D.fillRect( 0, 0, dim, dim );
tGraphics2D.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
tGraphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
tGraphics2D.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
tGraphics2D.drawImage( bufferedImage, (int)startw, (int)starth, dimwimg, dimhimg, null ); //draw the image scaled
File ff = new File(path + "jdata/tmp/prova.jpg");
ImageIO.write( tThumbImage, "JPG", ff); //write the image to a file
BufferedImage croppedContainMethod = ImageIO.read(ff);
return croppedContainMethod;
}
Nobody has idea so I will publish my solution...
I decided to continue to use Scalr (I didn't checked the Thumbnailator's last version but the previous ones failed on big pictures).
So first of all I call resize method, and then, if sizes of the new thumbnail are bigger then given ones I call crop method that crops a thumbnail by the center.. The code is the following:
BufferedImage thumbnail = Scalr.resize(sourceFile, Scalr.Method.ULTRA_QUALITY, Scalr.Mode.AUTOMATIC, destinationSize.width, destinationSize.height);
if (thumbnail.getWidth() > destinationSize.width)
thumbnail = Scalr.crop(thumbnail, (thumbnail.getWidth() - destinationSize.width) / 2, 0, destinationSize.width, destinationSize.height);
else if (thumbnail.getHeight() > destinationSize.height)
thumbnail = Scalr.crop(thumbnail, 0, (thumbnail.getHeight() - destinationSize.height) / 2, destinationSize.width, destinationSize.height);
It is not ideal, but at least it handles 'wide' images after generation of thumbnails

Image transparency - losing alpha on overlap

I'm having problems with image transparency. It's the following:
I have image1 and I need to overlap image2 over it. image2 is png with transparency. I want to create an image with watermark, that would be transparent image2 on top of image1.
When I open image2, that has transparency, and put it in a JFrame just to preview it, it opens with transparency. But when I use a BufferImage object's method getRGB to get image2's pixels and I use setRGB to overlay it over image1, image2 loses transparency and gets white background. Here's the code:
public class Test {
public static void main(String[] args) throws IOException {
BufferedImage image = ImageIO.read(new File("c:/images.jpg"));
BufferedImage image2 = ImageIO.read(new File("c:/images2.png"));
int w = image2.getWidth();
int h = image2.getHeight();
int[] pixels = image2.getRGB(0, 0, w, h, null, 0, w);
image2.setRGB(0, 0, w, h, pixels ,0 ,w);
// here goes the code to show it on JFrame
}
}
Please, can someone tell me what I'm doing wrong? I noticed that this code is losing image2's alpha. How could I make it to not lose alpha?
The problem's that setPixel will use the encoding for the image that receives the pixel in a direct way, without interpreting the graphical context for the original image. That won't happen if you use the graphics object.
Try:
public static void main(String[] args) throws IOException {
BufferedImage image = ImageIO.read(new File("c:/images.jpg"));
BufferedImage image2 = ImageIO.read(new File("c:/images2.png"));
int w = image2.getWidth();
int h = image2.getHeight();
Graphics2D graphics = image.createGraphics();
graphics.drawImage(image2, 0, 0, w, h, null);
graphics.dispose();
// here goes the code to show it on JFrame
}

In java, how do you write a java.awt.image.BufferedImage to an 8-bit png file?

I am trying to write out a png file from a java.awt.image.BufferedImage. Everything works fine but the resulting png is a 32-bit file.
Is there a way to make the png file be 8-bit? The image is grayscale, but I do need transparency as this is an overlay image. I am using java 6, and I would prefer to return an OutputStream so that I can have the calling class deal with writing out the file to disk/db.
Here is the relevant portion of the code:
public static ByteArrayOutputStream createImage(InputStream originalStream)
throws IOException {
ByteArrayOutputStream oStream = null;
java.awt.Image newImg = javax.imageio.ImageIO.read(originalStream);
int imgWidth = newImg.getWidth(null);
int imgHeight = newImg.getHeight(null);
java.awt.image.BufferedImage bim = new java.awt.image.BufferedImage(imgWidth,
imgHeight, java.awt.image.BufferedImage.TYPE_INT_ARGB);
Color bckgrndColor = new Color(0x80, 0x80, 0x80);
Graphics2D gf = (Graphics2D)bim.getGraphics();
// set transparency for fill image
gf.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.3f));
gf.setColor(bckgrndColor);
gf.fillRect(0, 0, imgWidth, imgHeight);
oStream = new ByteArrayOutputStream();
javax.imageio.ImageIO.write(bim, "png", oStream);
oStream.close();
return oStream;
}
The build in imageio png writer will write 32bit png files on all the platforms I have used it on, no matter what the source image is. You should also be aware that many people have complained that the resulting compression is much lower than what is possible with the png format. There are several independent png libraries available that allow you to specify the exact format, but I don't actually have any experience with any of them.
I found the answer as to how to convert RGBA to Indexed here: http://www.eichberger.de/2007/07/transparent-gifs-in-java.html
However, the resulting 8-bit png file only has 100% or 0% transparency. You could probably tweak the IndexColorModel arrays, but we have decided to make the generated file (what was an overlay mask) into an underlay jpg and use what was the static base as the transparent overlay.
It is an interesting question... It is late, I will experiment tomorrow. I will first try and use a BufferedImage.TYPE_BYTE_INDEXED (perhaps after drawing) to see if Java is smart enough to generate an 8bit PNG.
Or perhaps some image library can allow that.
[EDIT] Some years later... Actually, I made the code at the time, but forgot to update this thread... I used the code pointed at by Kat, with a little refinement on the handling of transparency, and saving in PNG format instead of Gif format. It works in making a 8-bit PNG file with all-or-nothing transparency.
You can find a working test file at http://bazaar.launchpad.net/~philho/+junk/Java/view/head:/Tests/src/org/philhosoft/tests/image/AddTransparency.java
using my ImageUtil class.
Since the code isn't that big, for posterity sake, I post it here, without the JavaDoc to save some lines.
public class ImageUtil
{
public static int ALPHA_BIT_MASK = 0xFF000000;
public static BufferedImage imageToBufferedImage(Image image, int width, int height)
{
return imageToBufferedImage(image, width, height, BufferedImage.TYPE_INT_ARGB);
}
public static BufferedImage imageToBufferedImage(Image image, int width, int height, int type)
{
BufferedImage dest = new BufferedImage(width, height, type);
Graphics2D g2 = dest.createGraphics();
g2.drawImage(image, 0, 0, null);
g2.dispose();
return dest;
}
public static BufferedImage convertRGBAToIndexed(BufferedImage srcImage)
{
// Create a non-transparent palletized image
Image flattenedImage = transformTransparencyToMagenta(srcImage);
BufferedImage flatImage = imageToBufferedImage(flattenedImage,
srcImage.getWidth(), srcImage.getHeight(), BufferedImage.TYPE_BYTE_INDEXED);
BufferedImage destImage = makeColorTransparent(flatImage, 0, 0);
return destImage;
}
private static Image transformTransparencyToMagenta(BufferedImage image)
{
ImageFilter filter = new RGBImageFilter()
{
#Override
public final int filterRGB(int x, int y, int rgb)
{
int pixelValue = 0;
int opacity = (rgb & ALPHA_BIT_MASK) >>> 24;
if (opacity < 128)
{
// Quite transparent: replace color with transparent magenta
// (traditional color for binary transparency)
pixelValue = 0x00FF00FF;
}
else
{
// Quite opaque: get pure color
pixelValue = (rgb & 0xFFFFFF) | ALPHA_BIT_MASK;
}
return pixelValue;
}
};
ImageProducer ip = new FilteredImageSource(image.getSource(), filter);
return Toolkit.getDefaultToolkit().createImage(ip);
}
public static BufferedImage makeColorTransparent(BufferedImage image, int x, int y)
{
ColorModel cm = image.getColorModel();
if (!(cm instanceof IndexColorModel))
return image; // No transparency added as we don't have an indexed image
IndexColorModel originalICM = (IndexColorModel) cm;
WritableRaster raster = image.getRaster();
int colorIndex = raster.getSample(x, y, 0); // colorIndex is an offset in the palette of the ICM'
// Number of indexed colors
int size = originalICM.getMapSize();
byte[] reds = new byte[size];
byte[] greens = new byte[size];
byte[] blues = new byte[size];
originalICM.getReds(reds);
originalICM.getGreens(greens);
originalICM.getBlues(blues);
IndexColorModel newICM = new IndexColorModel(8, size, reds, greens, blues, colorIndex);
return new BufferedImage(newICM, raster, image.isAlphaPremultiplied(), null);
}
}
Thanks for responding, I was going to try an TYPE_BYTE_INDEXED with an IndexColorModel and may still but if ImageIO writes out 32-bit regardless it appears that I may be wasting my time there.
The image I am trying to write out can be very large (up to 8000x4000) but is just a simple mask for the image underneath, so will only have a ~30% transparent gray and a 100% transparent cutout. I would use a GIF but IE6 seems to have trouble with displaying one that large.
It only gets generated once and in an internal set-up type screen, so performance isn't an issue either, but it does have to be done within the java code and not by an offline utility.
The libraries that you specified might be used to transform it while writing... I am going to go check that out.
If anyone has a better way, please let me know!!
Thanks!

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