Category Archive for: The Complete Reference Images

Loading an Image

Loading an Image The other way to obtain an image is to load one. To do this, use the getlmage( ) method defined by the Applet class. It has the following forms: Image getimage(URL 111:1) Image getimage Ikl, url, String image Name) The first version returns an Image object that encapsulates the image found at the…

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ImageObserver

ImageObserver ImageObserver is em interface used to receive notification as an image is being generated.lt:pageObs.ervcl’ defines only one method: imagcUpdate(). Using an image observer allows you t.o perform other actions; such as show a progress indicator or an attract screen” as ‘you arc informed of the progress of the download. This kind of notification isvery useful when an image…

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Image Observer Example

Image Observer Example Now let’s look at a practical example that overrides image Update( ) to make a version I” of the Simple Image Load applet that doesn’t flicker as much. The default implementation of image Update( ) in Applet has.several problems. First, it repaints the entire image each time any new data arrives. This causes flashing between…

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Double Buffering

Double Buffering Not only are images useful for storing pictures, as we’ve just shown, but you can. also use them as offscreen drawing surfaces. This allows you to render any image including ‘text and graphics, to an. offscreen buffer that you can display at a later time. The advantage to doing this is that the image is seen…

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Media Tracker

Media Tracker Many early Java developers found the Imageobserver interface far too difficult to understand and manage when there were multiple eLhage to be loaded. The developer community-asked for q simpler solution that would allow programmers to load all of their images synchronously, without having to worry about Image Tlpd Atct ). In response to this, Sun Micro systems…

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lmage Filter

image Filter  Given the ImagcProduccr and Imageconsumer interface pair-and their concrete classes McmorylmageSourcc and PixelGrabber-you can create an ‘arbitrary set of translation filters that takes a source of pixels, modifies them, ami passes them on to an arbitrary consumer. This mechanism is analogous to the way concrete classes arc created from the abstract l~$.classes InputStream, OutputStream, Reader, and Writer is stream…

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Crop image Filter

Crop image Filter Crop Magel filters an image source to extract a rectangular region. One situation in which this filter is valuable is where you want to use several small images from a single, larger source image. Loading twenty 2K images takes much longer than loading a single 40K image that has many frames of an animation tiled into it.…

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Image Filter Demo java

Image Filter Demo java The ImageFilter Demo class is the applet framework for our sample image filters, It employs a simple Borderlayout, with a Panel at the Soutl: position to hold the buttons that will represent each filter. A Label object occupies the North slot for informational messages about filter progress. The Center is where the image (which…

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Loaded Image java

Loaded Image java Loaded Image is a convenient subclass of Canvas, which takes an image at construction time and asynchronously loads it using MediaTracker. Loaded Image the behaves properly inside of Layout Manager control, because it overrides the getPreferredSize( ) and getMinimumSize( ) methods. Also, it has a method called sct( ) that can be used to set a !lew…

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Contrast.java

Contrast.java The Contrast filter is very similar to Grayscale, except its override of filth crRCO( ) is , slightly more complicated. The algorithm it uses for contrast enhancement takes the red, green, and blue values separately and boosts them by ‘1.2 times if they arc already brighter than 128. If they are below 128, then they are…

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