How do I convert a Java image to a jpeg encoded byte array?
The ImageIO class can be used to write an image as a JPEG encoded stream.If you write that stream to a ByteArrayOutputStream then you will end up with a byte array that contains the JPEG encoded image....
View ArticleHow do I convert a Java Image to a png byte array?
The ImageIO class can be used to write an image as a PNG encoded stream.If you write that stream to a ByteArrayOutputStream then you will end up with a byte array that contains the PNG encoded image....
View ArticleHow do I paint a tiled image, for example as a background of a panel?
The TexturePaint class can be used to achieve that. public void paintComponent(Graphics g) { if(paint == null) { try { // Create TexturePaint instance the first time int height = image.getHeight(this);...
View ArticleHow do I read an image from a byte array in Java?
Create a ByteArrayInputStream from your byte array and then use ImageIO class to read image from that stream. InputStream in = new ByteArrayInputStream(bytearray); BufferedImage image = ImageIO.read(in);
View ArticleHow can I return an image using a servlet?
Basically you stream the image to the http response stream. Easier to explain with code so here’s a simple example. import java.io.File; import java.io.FileInputStream; import java.io.IOException;...
View ArticleHow to determine if Image supports alpha?
The PixelGrabber can be used to get a ColorModel instance that has a method to tell if alpha is supported. You just need to load a single pixel from the image to get the ColorModel. PixelGrabber pg =...
View ArticleHow to convert an Image to a BufferedImage?
// Load the image image = new ImageIcon(image).getImage(); // Determine transparency for BufferedImage // http://helpdesk.objects.com.au/java/how-to-determine-if-image-supports-alpha boolean hasAlpha =...
View ArticleHow to embed images in HTML mail using JavaMail
Multipart emails can be used to send html content with JavaMail. If you want to use images in the html content you can either specify the url of the image on an external server, or you can embed the...
View ArticleChanging the ColorModel of a BufferedImage
Often when doing image processing we need to change the color of the image pixels. This ultimately involves iterating through all the pixels of an image changing values as required. This can be a slow...
View ArticleStop iPhoto or Aperture opening when iPhone plugged in
When you plugin your iPhone (or iPod touch) into your Mac either iPhoto or Aperture get automatically launched. Reason for this is so any photos can be imported from the iPhone to your Mac. You can...
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