javax.imageio

问题 When using javax.imageio.ImageIO to load a large-resolution (9000x9000) JPEG from disk, it takes more than 1 minute in my scala application. I tried creating a Java-only project, but it still takes too long - around 30 seconds. This is how I load the image: File file = new File("/Users/the21st/slow2.jpg"); BufferedImage image = ImageIO.read(file); Is there any way to improve performance on reading progressively encoded large-res JPEGs in Java? The image in question is this one (moderators,

来源： https://stackoverflow.com/questions/20425507/how-to-create-image-in-java

来源： https://stackoverflow.com/questions/57573356/pink-background-colour-in-output-tiff-when-reading-and-writing-some-tiff-images

来源： https://stackoverflow.com/questions/8039444/how-to-detect-corrupted-images-png-jpg-in-java

来源： https://stackoverflow.com/questions/8039444/how-to-detect-corrupted-images-png-jpg-in-java

来源： https://stackoverflow.com/questions/63091001/unable-to-read-jpeg-2000-images-in-java-jai-error-file-too-long

来源： https://stackoverflow.com/questions/63091001/unable-to-read-jpeg-2000-images-in-java-jai-error-file-too-long

问题 I am just reading an image file as byte array and writing it in another directory as image file using BufferedImage like shown in the link : https://www.tutorialspoint.com/How-to-convert-Byte-Array-to-Image-in-java But for some image files the created new image file is rotated upside down. Majority of the images works fine. And also created new images size are increased compared to the source image. What i am missing here ? 来源： https://stackoverflow.com/questions/62473381/java-byte-array-to

问题 Here is my code. I get a blob from my database. Which is returned to me like this: java.io.BufferedInputStream@16e31e37. Now im trying to display the image from my servlet in the browser however my BufferedImage image is always null. I dubugged it and notice my blob length is always 34.. Not matter the image. @Path("/photo" ) public class DisplayPhoto { @GET @Path("{id}") @Produces("image/*") public Response post(@PathParam("id") String id) throws IOException { Connection con = connection();

问题 I actually get the input source from PostgreSQL. The table column type is bytea. I want to convert the byte back to original image. BuffredImage bImageFromConvert = ImageIo.read(new ByteArrayInputStream(rsvalue.getBytes(10))); ImageIO.write(bImageFromConvert, "jpg", new File("D:\\"+ rsvalue.getString(2) +".jpg")); The error as below : Exception in thread "main" java.lang.IllegalArgumentException: im == null! at javax.imageio.ImageIO.write(ImageIO.java:1457) at javax.imageio.ImageIO.write