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问题 How can I use the Windows command line to change the extensions of thousands of files to *****.jpg ? 回答1: You can use ren (as in rename ): ren *.XXX *.YYY And of course, switch XXX and YYY for the appropriate extensions. It will change from XXX to YYY. If you want to change all extensions, just use the wildcard again: ren *.* *.YYY One way to make this work recursively is with the FOR command. It can be used with the /R option to recursively apply a command to matching files. For example: for

问题 There is an IP web camera that I wrote a .NET class for sometime ago. It's basically a Timer implementation that pings a snapshot CGI script from the camera every five seconds. The camera itself is very rudamentary; it does not have any sort of API for me to work with, the only thing I can do programmatically (remotely) is invoke this script. The script returns a 640x480 JPEG image. Simple. Now what I need to be able to do is take a days worth of these images, and create a "time lapse" AVI

问题 I have build a program which allows me to insert comment and the title of an Image through System.Image.Drawing so right now, I have trouble trying to overwrite the existing Jpeg file with the one that has comment and title added into it, but I am encountering error while deleting the file, so I'm not sure what to do as I have tried disposing the file but I cant saved it in that case, due to the fact that I disposed it too early, but I cant saved it because the existing file name is not

问题 How can I convert a BITMAP in byte array format to JPEG format using .net 2.0? 回答1: What type of byte[] do you mean? The raw file-stream data? In which case, how about something like (using System.Drawing.dll in a client application): using(Image img = Image.FromFile("foo.bmp")) { img.Save("foo.jpg", ImageFormat.Jpeg); } Or use FromStream with a new MemoryStream(arr) if you really do have a byte[] : byte[] raw = ...todo // File.ReadAllBytes("foo.bmp"); using(Image img = Image.FromStream(new

问题 When creating an UIImage with corrupt/incomplete JPEG data, the console will print out <Error>: Corrupt JPEG data: premature end of data segment The incomplete image will be shown, with grey filling up the incomplete part. I do not want this to happen. I desperately tried with a try-catch block but it does not catch the error. Is there any way to catch the error? 回答1: Depends on how you are getting the data etc. Maybe this is what you are looking for: iphone-corrupt-jpeg-data-for-image

问题 I'd like to convert gif images to jpeg using Java. It works great for most images, but I have a simple transparent gif image: Input gif image http://img292.imageshack.us/img292/2103/indexedtestal7.gif [In case the image is missing: it's a blue circle with transparent pixels around it] When I convert this image using the following code: File file = new File("indexed_test.gif"); BufferedImage image = ImageIO.read(file); File f = new File("indexed_test.jpg"); ImageIO.write(image, "jpg", f); This

问题 I'm trying to use a JPEG image in a QImage object from a Python script, with PyQt4. The script itself works perfectly, the image loads and can be manipulated and rendered and all. However, when I try to "compile" this script with py2exe, everything works but the JPEG image. Replacing it with a PNG equivalent works, but since my program downloads images from the web, they won't always be in PNG format and I can't afford converting them all with another library. I've discovered that JPEG image

问题 I would like to read in a JPEG-Header and analyze it. According to Wikipedia, the header consists of a sequences of markers. Each Marker starts with FF xx , where xx is a specific Marker-ID. So my idea, was to simply read in the image in binary format, and seek for the corresponding character-combinations in the binary stream. This should enable me to split the header in the corresponding marker-fields. For instance, this is, what I receive, when I read in the first 20 bytes of an image:

问题 For my work I sketch building dimensions,and the software creates a .jpg file of the 2D sketch like this The problem is that sometimes if I haven't zoomed in on the software close enough, the resulting .jpg will leave the sketch blurry due to the large overall .jpg size (lots of white space). The software also produces a .xml file which contains the dimensions, labels and coordinate points of the sketched building(s). I'm fairly new to XML but am wondering how do I use the data within the XML

问题 It doesn't matter how I exactly encrypt and decode files. I operate with file as a char massive , everything is almost fine, until I get file, which size is not divide to 8 bytes. Because I can encrypt and decode file each round 8 bytes, because of particular qualities of algorithm (size of block must be 64 bit). So then, for example, I face .jpg and tried simply add spaces to end of file, result file can't be opened ( ofc. with .txt files nothing bad happen). Is any way out here? If you want