javax.imageio

I get this error by downloading an image by HTTP. I have looked at the answer here but even the valid images don't return YES from the function. Any other ideas? The code to get the image is simple enough. This happens in a background thread. NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]]; UIImage *image = [UIImage imageWithData:data]; This is the function from that thread: - (BOOL)isJPEGValid:(NSData *)jpeg { if ([jpeg length] < 4) return NO; const char * bytes = (const char *)[jpeg bytes]; if (bytes[0] != 0xFF || bytes[1] != 0xD8) return NO; if (bytes[[jpeg

I am trying to do some image processing in Java. I used ImageIO library for reading and writing images. I can read the image pixel value in two ways as follows (there might be other methods which do not know). Using BufferedImage's getRGB method: pixel = image.getRGB(x,y); Using Raster's getSample method: WritableRaster raster = image.getRaster(); pixel = raster.getSample(x,y,0); What is the difference in the above two approaches? 1: The first approach will always return a pixel in int ARGB format, and in the sRGB color space. Regardless of the image's internal representation. This means that

I have a Data-URL from an image file and have to pass it through to another function. Along this path from Data-URL to the BufferedImage it needs to be a byteArray. my approach was the following: String dataUrl; byte[] imageData = dataUrl.getBytes(); // pass the byteArray along the path // create BufferedImage from byteArray BufferedImage inputImage = ImageIO.read(new ByteArrayInputStream(imageData)); // If the picture is null, then throw an unsupported image exception. if (inputImage == null) { throw new UnknownImageFormatException(); } The problem is, it always throws the

first I'd like to explain the situation/requirements that lead to the question: In our web application we can't support CMYK images (JPEG) since IE 8 and below can't display them. Thus we need to detect when someone wants to upload such an image and deny it. Unfortunately, Java's ImageIO won't read those images or would not enable me to get the detected color space. From debugging it seems like JPEGImageReader internally gets the color space code 11 (which would mean JCS_YCCK ) but I can't safely access that information. When querying the reader for the image types I get nothing for CMYK, so I

I am writing an web application where I need to send an image from servlet to client. Image is generated dynamically and is quite big(+-2MB). It might be jpeg, png, or gif. Now, I am using ImageIO.write() to write the image to output stream, but its veeeery slow. It takes up to 6 seconds till the client see the image. I need to speed it up. Any suggestions? btw. I am aware of Looking for a faster alternative to ImageIO topic. But it didn't help me. Since it's slow with PNG ImageMagick is not a solution and I have tested JAI and it was even worse. Thanks in advance Edit: To show you some code: