Actually, I’d like turn the problem around, and say I’m surprised that so many different platforms and tools actually produce the same values. 🙂 JPEG is lossy First of all, JPEG is a lossy image compression method. This means that reproducing the exact data of the original is not possible. Or, if you like, several … Read more
Last time I had to do this, a couple of years ago, the standard API couldn’t read EXIF data. This library can do so though: http://www.drewnoakes.com/code/exif/
Try to check the encoding of the JPEG. ImageIO can’t read CMYK-encoded jpeg images for example. AFAIK, ImageIO hasn’t been updated for years, so you’d like to try and use the official alternative/extension: JAI ImageIO. Unforutnately, JAI ImageIO needs some native libraries installed into the JRE, which might be unwanted. We do the following: use … Read more
The following blog post is where I got my answer when I had issues with modifying and saving Exif data Caffeinated Cocoa. This works on iOS. Here is my test code for writing Exif and GPS data. It pretty much a copy and paste of the code from the above blog. I am using this … Read more
Old post, but for future reference: Inspired by this question and links found here, I’ve written a JPEGImageReader plugin for ImageIO that supports CMYK color models (both with original color model, or implicitly converted to RGB on read). The reader also does proper color conversion, using the ICC profile embedded in the JPEG stream, in … Read more
From http://usna86-techbits.blogspot.com/2010/01/inputstream-from-url-bufferedimage.html It works very fine! Here is how you can make an InputStream for a BufferedImage: URL url = new URL(“http://www.google.com/intl/en_ALL/images/logo.gif”); BufferedImage image = ImageIO.read(url); ByteArrayOutputStream os = new ByteArrayOutputStream(); ImageIO.write(image, “gif”, os); InputStream is = new ByteArrayInputStream(os.toByteArray());
A more succinct way is to get the ImageWriter directly from ImageIO: ImageWriter jpgWriter = ImageIO.getImageWritersByFormatName(“jpg”).next(); ImageWriteParam jpgWriteParam = jpgWriter.getDefaultWriteParam(); jpgWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); jpgWriteParam.setCompressionQuality(0.7f); ImageOutputStream outputStream = createOutputStream(); // For example implementations see below jpgWriter.setOutput(outputStream); IIOImage outputImage = new IIOImage(image, null, null); jpgWriter.write(null, outputImage, jpgWriteParam); jpgWriter.dispose(); The call to ImageWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT) is needed in order to explicitly set … Read more
I’m not convinced its a good idea to return image data in a REST service. It ties up your application server’s memory and IO bandwidth. Much better to delegate that task to a proper web server that is optimized for this kind of transfer. You can accomplish this by sending a redirect to the image … Read more
OpenJDK does not have a native JPEG encoder, try using Sun’s JDK, or using a library (such as JAI AFAIK, regarding the “pinkish tint”, Java saves the JPEG as ARGB (still with transparency information). Most viewers, when opening, assume the four channels must correspond to a CMYK (not ARGB) and thus the red tint. If … Read more
try(ImageInputStream in = ImageIO.createImageInputStream(resourceFile)){ final Iterator<ImageReader> readers = ImageIO.getImageReaders(in); if (readers.hasNext()) { ImageReader reader = readers.next(); try { reader.setInput(in); return new Dimension(reader.getWidth(0), reader.getHeight(0)); } finally { reader.dispose(); } } } Thanks to sfussenegger for the suggestion