jpeg

问题 I have a code that turns a byte array into BufferedImage using ImageIO. public void readImage(byte[] imageBytes) { ByteArrayInputStream inputStream = new ByteArrayInputStream(imageBytes); BufferedImage bufferedImage = null; try { bufferedImage = ImageIO.read(inputStream); } catch (Exception e) { e.printStackTrace(); } // do something with bufferedImage } But I found that for certain jpeg images, it throws a CMMException, every time. Here's the stack trace: java.awt.color.CMMException: Cannot

问题 I'm attempting to get a JPEG into a BufferedImage to display on a JPanel . However, javax.imageio.ImageIO.read() seems to be very fussy about the JPEGs it processes, often throwing an IIOException . The same JPEGs open fine in pretty much any image reader you'd care to name. I've looked at Apache's Sanselan and JAI. But Sanselan can't process JPEGs and JAI isn't available for 64-bit Windows platforms and doesn't seem to be maintained (the last update was in 2006). A previous answer on

问题 I have the need to convert any multipage PDF file into a set of JPGs. Since the PDF files are supposed to come from a scanner, we can assume each page just contains a graphic object to extract, but I cannot be 100% sure of that. So, I need to convert any renderable content from each page into a single JPEG file. How can I do this with iText? If I can't do this with iText, what Java library can achieve this? Thanks. 回答1: ICEpdf - http://www.icepdf.org/ - has an open source entry version which

问题 I'd like to plot multiple plots in separate bitmap files using the file name pattern (for example, for JPEG) file.%03d.jpg in R. I tried using something like: somevar <- 1 jpg(paste(sep='',filename,'.%03d.jpg')) while(somevar <= n) { plot(data[somevar]) dev.new() somevar <- somevar + 1 } dev.off() but it creates one .jpg file and several Rplotnnn.pdf files. How can I change the default device to jpg , and use the custom file name pattern? 回答1: I think this should work somevar <- 1 while

问题 Is it correct that if we have a BufferedImage object in java, we could potentially write it out in ANY format using ImageIO.write (if we have a Writer object for the same)? I tried writing a BufferedImage object into a jpg file, it outputted an empty image file however when i tried writing it in to a png file, it worked fine. 回答1: A BufferedImage can be written into any format that ImageIO.write supports (that is, has an ImageWriter available), yes. Please show the code if you can't get it to

问题 Is it correct that if we have a BufferedImage object in java, we could potentially write it out in ANY format using ImageIO.write (if we have a Writer object for the same)? I tried writing a BufferedImage object into a jpg file, it outputted an empty image file however when i tried writing it in to a png file, it worked fine. 回答1: A BufferedImage can be written into any format that ImageIO.write supports (that is, has an ImageWriter available), yes. Please show the code if you can't get it to

问题 I am working with jpeg files, when I look at the details of a jpeg file under windows (right-click->properties), under the Details tab there are entries for Title, Subject, Rating, Tags, Comments, etc. How can I set these properties in Xamarin (Android)? Thanks. 回答1: Here is some code to guide you. ExifInterface newExif= new ExifInterface(filePath); newExif.SetAttribute(ExifInterface.TagGpsLatitude, "teste lat"); newExif.SetAttribute(ExifInterface.TagGpsLatitudeRef, "teste lat ref"); newExif

问题 I have many JPEG images which contain corrupted XMP XML blocks. I can easily fix these blocks but I'm unsure how to write the 'fixed' data back to the image files. I'm currently using JAVA but am open to anything that will make this task easy. This is the goal for another question around XMP XML asked earlier. 回答1: In JAVA you can use the Apache Sanselan library: String newXmpXmlString = "<the><new/><xmp/><xml/></the>"; File file = new File('path/to/file'); new JpegXmpRewriter().updateXmpXml

问题 I am trying to extract a BitmapImage from a JPG. This is the code I have: FileStream fIn = new FileStream(sourceFileName, FileMode.Open); // source JPG Bitmap dImg = new Bitmap(fIn); MemoryStream ms = new MemoryStream(); dImg.Save(ms, ImageFormat.Jpeg); image = new BitmapImage(); image.BeginInit(); image.StreamSource = new MemoryStream(ms.ToArray()); image.EndInit(); ms.Close(); image comes back with a 0 × 0 image, which of course means it didn't work. How do I do this? 回答1: Try this: public

问题 I'm trying to save, and then print a panel in c#. My only problem is that it only saves the visible areas and when I scroll down it prints that. Bitmap bmp = new Bitmap(this.panel.Width, this.panel.Height); this.panel.DrawToBitmap(bmp, new Rectangle(0, 0, this.panel.Width, this.panel.Height)); bmp.Save("c:\\panel.jpg", System.Drawing.Imaging.ImageFormat.Jpeg); 回答1: Try following public void DrawControl(Control control,Bitmap bitmap) { control.DrawToBitmap(bitmap,control.Bounds); foreach