Create image from scratch with JMagick
- by Michael IV
I am using Java port of ImageMagick called JMagick .I need to be able to create a new image and write an arbitrary text chunk into it.The docs are very poor and what I managed to get so far is to write text into the image which comes from IO.Also , in all the examples I have found it seems like the very first operation ,before writing new image data , is always loading of an existing image into ImageInfo instance.How do I create an image from scratch with JMagick and then write a text into it?
Here is what I do now :
try {
ImageInfo info = new ImageInfo();
info.setSize("512x512");
info.setUnits(ResolutionType.PixelsPerInchResolution);
info.setColorspace(ColorspaceType.RGBColorspace);
info.setBorderColor(PixelPacket.queryColorDatabase("red"));
info.setDepth(8);
BufferedImage img = new BufferedImage(512,512,BufferedImage.TYPE_4BYTE_ABGR);
byte[] imageBytes = ((DataBufferByte) img.getData().getDataBuffer()).getData();
MagickImage mimage = new MagickImage(info,imageBytes);
DrawInfo aInfo = new DrawInfo(info);
aInfo.setFill(PixelPacket.queryColorDatabase("green"));
aInfo.setUnderColor(PixelPacket.queryColorDatabase("yellow"));
aInfo.setOpacity(0);
aInfo.setPointsize(36);
aInfo.setFont("Arial");
aInfo.setTextAntialias(true);
aInfo.setText("JMagick Tutorial");
aInfo.setGeometry("+40+40");
mimage.annotateImage(aInfo);
mimage.setFileName("text.jpg");
mimage.writeImage(info);
} catch (MagickException ex) {
Logger.getLogger(LWJGL_IDOMOO_SIMPLE_TEST.class.getName()).log(Level.SEVERE, null, ex);
}
It doesn't work , the JVM crashes with access violation as it probably expects for the input image from IO.
