jpeg

问题 Active Directory can store images in JPEG File Interchange Format (JFIF) according to the jpegPhoto Attribute definition. I'd like to use this but I'd never heard of JFIF. First, are all JPEG files JFIFs? Second, does a WPF JpegBitmapEncoder produce a JFIF file? I guess if the first is true, this will be but if it's not...? 回答1: JPEG = the compression algorithm (Joint Photographic Experts Group) JFIF = the file format (JPEG File Interchange Format) Effectively when you mention jpeg/jpg you

问题 What is the best way to move/copy file while maintaining all its attributes (Date created, Date, etc)? Thank you 回答1: If you are using Java 7, use java.nio.file.Files.copy(Path source, Path target, CopyOption... options) Use the COPY_ATTRIBUTES option to maintain the last modified time: COPY_ATTRIBUTES Attempts to copy the file attributes associated with this file to the target file. The exact file attributes that are copied is platform and file system dependent and therefore unspecified.

问题 As the title mentioned. I search with Google and Stackoverflow, all resources are for UIImage converting, or convert NSImage FROM CVPixelBufferRef. Now what I want to do is convert JPEG raw data TO CVPixelBufferRef so that I could generate a movie file with live jpeg streams. 回答1: You can use the following method to convert from NSImage to CVPixelBufferRef : - (CVPixelBufferRef)newPixelBufferFromNSImage:(NSImage*)image { CGColorSpaceRef colorSpace = CGColorSpaceCreateWithName

问题 I can successfully get the mp3 ID3 tags out of my mp3 app, using php. I am left with a huge BLOB. I'm sure this is pretty straightforward, but I just need a little help in the right direction. What I'd like to end up with is (BLOB DATA CORRECTED): $media_year = implode($ThisFileInfo['comments_html']['year']); $media_genre = implode($ThisFileInfo['comments_html']['genre']); $media_jpg = [BLOBDATA]; ( I know that makes no programming sense, but you get the idea. The first two lines work fine

问题 I'm trying to upload a jpg image from my iPhone to my ImageShack.com account. Everyone says to use the MASSIVE THOUSANDS of lines of code in the 3rd party ASI code. Is there a simple example, just of the upload code? (I'll take either sync or async) Shouldn't this be doable with under 25 lines of code? Thanks. 来源： https://stackoverflow.com/questions/4167958/brief-code-example-to-upload-image-from-iphone-to-imageshack-account

问题 The JPEG file signature states that the JPEG EOI (End of Image) marker is given by the final FF D9 . However I very occasionally come across JPEGs that also have a small amount of data following this EOI (in this example 02 24 ... ): FF D8 FF E1 ... ... FF D9 02 24 02 24 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 48 00 00 00 00 00 00 00 00 00 00 00 00 27 10 00 00 00 00 00 00 00 00 27 10 00 00 00 00 27 10 00 00 27 10 00 00 00 00 00 00 00 00 27 10 00 00 00 00 00 00 00 00 00 00 00 00 00

问题 Does anyone know how to upload a multi-page pdf with Paperclip and convert each page into a Jpeg? So far, every time I upload a PDF, it only allows me to see the first page of the PDF as a JPEG. But I would like to be able to upload and convert every page from the PDF into a JPEG. Is there any gem or plug-in that can help me upload a 10-pg PDF and Convert/Store in the Database as 10 JPEG files? I have looked at docsplit-images gem, but I am not sure if that is the solution best solution or

问题 i have Photos in multiple directories. I want to use jpegtran (command line tool) to recursivly go through each one, optimise it, and save it (overwrite it) if they are all in one folder i use this for JPEG in *.jpg ; do jpegtran -optimize $JPEG > $JPEG; done but i can't get it working recursivly and overwriting the same file (rather than to a new filename) any tips? 回答1: jpegtran whole directory find /the/image/path -name "*.jpg" -type f -exec jpegtran -copy none -optimize -outfile {} {} \;

问题 i have Photos in multiple directories. I want to use jpegtran (command line tool) to recursivly go through each one, optimise it, and save it (overwrite it) if they are all in one folder i use this for JPEG in *.jpg ; do jpegtran -optimize $JPEG > $JPEG; done but i can't get it working recursivly and overwriting the same file (rather than to a new filename) any tips? 回答1: jpegtran whole directory find /the/image/path -name "*.jpg" -type f -exec jpegtran -copy none -optimize -outfile {} {} \;

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . Is there any way to convert a android.graphics.Bitmap instance into jpeg in android? 回答1: Try with compress method like: bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outStream); Here is a sample program :