javax.imageio

问题 I see in the javax.imageio spec that thread-safety is not a goal, despite I've seen several examples using ImageIO.read() and ImageIO.write() for uploading/sanitizing images in a web environment. So, my question is, despite what the spec says, is ImageIO thread-safe? 回答1: ImageIO is not thread safe (or at least one of it's plugins is not), in at least one of my environments. I am in the process of debugging an issue where png and jpg files don't get loaded correctly (sometimes solid gray,

问题 I'm interested in taking a tif image and adding a layer to it that contains text with Java, preferably with the Twelve Monkeys image library if possible. I can tweak the code from here to either add text to a tif or create a new tif of the same size with only text, but not save them as a multi-page tif. For example: import javax.imageio.*; import javax.imageio.stream.ImageOutputStream; import java.awt.*; import java.awt.image.*; import java.io.*; public class ImageUtil { public static void

问题 I am trying to programatically set the dpi metadata of an jpeg image in Java. The source of the image is a scanner, so I get the horizontal/vertical resolution from TWAIN, along with the image raw data. I'd like to save this info for better print results. Here's the code I have so far. It saves the raw image (byteArray) to a JPEG file, but it ignores the X/Ydensity information I specify via IIOMetadata. Any advice what I'm doing wrong? Any other solution (third-party library, etc) would be

问题 Sounds simple right? Use ImageIO.read(new ByteArrayInputStream(bytes)); Here's the wrinkle. For some reason it is detecting a jpeg as a bmp, and that is the first ImageReader returned when I call ImageInputStream iis = ImageIO.createImageInputStream(new ByteArrayInputStream(bytes)); Iterator<ImageReader> readers=ImageIO.getImageReaders(iis); This causes the image to come out corrupted. Is there a way to tell through java short of looking directly at the bytes for the header, and failing that

问题 I have been browsing Stackoverflow all day looking for how to do this and I have not been successful yet I am packaging a quick game I made into a executable jar but I didnt reference the images correctly I just referenced the files background = ImageIO.read(new File("wood.jpeg")); I have my classes in src default package Im not sure where I should add the images or if I have to add it to the build path or correct way of adding the images to the build path in the newest version of eclipse 回答1

问题 I want to be able to take an animated GIF as input, count the frames (and perhaps other metadata), and convert each to a BufferedImage . How can I do this? 回答1: If you want all the frames to be the same size (for optimized GIFs) try something like this: try { String[] imageatt = new String[]{ "imageLeftPosition", "imageTopPosition", "imageWidth", "imageHeight" }; ImageReader reader = (ImageReader)ImageIO.getImageReadersByFormatName("gif").next(); ImageInputStream ciis = ImageIO

问题 I want to save the image on disk such as c:/images which is captured by webcam using java ..and again I want to display that image on JForm as a label... is this possible using java and netbeans I'm new in java 回答1: you can save image private static void save(String fileName, String ext) { File file = new File(fileName + "." + ext); BufferedImage image = toBufferedImage(file); try { ImageIO.write(image, ext, file); // ignore returned boolean } catch(IOException e) { System.out.println("Write

问题 I am trying to read an Image as an InputStream . But for some reason I always get an IllegalArugmentException . Here is my code: BufferedImage i = null; i = ImageIO.read(getClass().getResourceAsStream("/res/graphics" + path)); 回答1: Reason: Your resource evaluates to null and that is why the exception API doc Throws: IllegalArgumentException - if input is null . Solution: If res/graphics/whatever is in classpath at root then it will return not null 回答2: Basically, the resource with the name

问题 I have this code. It simply reads a GIF file, redraws it with background and output to a new GIF file. The problem is the result file becomes strange. I have no idea why it becomes poor quality. The problem doesn't happen on JPG files. How to fix it? import java.awt.Color; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class ImageTest { public static void main

问题 I encountered the Unsupported Image Type error due to an incompatible colour profile using com.sun.imageio.plugins.jpeg.JPEGImageReader . I later found the TwelveMonkeys plugins that are proven to fix this issue and have referenced the dependent .jars in my project classpath. I downloaded them from the TwelveMonkeys github repository. Note i'm using version 3.0.2 because I'm running on Java 6 with JDK 1.6.0_45. These are the .jars I've added to my project: common-lang-3.0.2.jar common-io-3.0