libjpeg

问题 This question is related to another question I asked here: Error reading image using jpeg_read from Matlab's jpeg toolbox I've been trying to compile the jpeg toolbox under Windows 7 (using the commands Shai provided in the answer to the question I posted), but I get the following error: jpeg_read.c(52) : fatal error C1083: Cannot open include file: 'jerror.h': No such file or directory which I believe happened because I haven't built libjpeg. I tried to build libjpeg6b like jpegtoolbox's

问题 I am trying to build an uploader which uploads progressive files in two steps: Upload the minimal number of bytes to create a thumbnail (0-10%) Upload the rest of the bytes for the thumbnail. (11%-100%) I want to do this to have thumbnails available earlier without having to upload a seperate thumbnail. Taking an image (3426398 Byte) which was created with jpegtran -copy all -progressive -outfile progressive.jpg original.jpg and then taking the first 350000 bytes with dd if=progressive.jpg of

问题 libjpeg8 include are those two functions, but in libjpeg-turbo has the following: //jconfig.h #define JPEG_LIB_VERSION 62 ... //jpeglib.h #if JPEG_LIB_VERSION >= 80 /* Data source and destination managers: memory buffers. */ EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo, unsigned char ** outbuffer, unsigned long * outsize)); EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo, unsigned char * inbuffer, unsigned long insize)); #endif if i try to use "JPEG_LIB_VERSION 80" i'll get the

问题 libjpeg8 include are those two functions, but in libjpeg-turbo has the following: //jconfig.h #define JPEG_LIB_VERSION 62 ... //jpeglib.h #if JPEG_LIB_VERSION >= 80 /* Data source and destination managers: memory buffers. */ EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo, unsigned char ** outbuffer, unsigned long * outsize)); EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo, unsigned char * inbuffer, unsigned long insize)); #endif if i try to use "JPEG_LIB_VERSION 80" i'll get the

问题 Im using sorl.thumbnail for django locally on my mac and have been having trouble with PIL, but today i finally managed to get it installed - was some trouble with libjpeg. I can now upload and use images - but I cant resize them using sorl.thumbnail. When i try i get the following error: Wrong JPEG library version: library is 80, caller expects 62 Does anyone know a good solution for this. I dont know wether whatever sorl uses requires an earlier version of libjpeg or wether there is some

问题 I'm trying to load part of big JPEG file (hundreds of megapixels) with a limited memory footprint. I need only about a 1000 scanlines of 20000. It seems that current implementation of libjpeg (as well as its fork libjpeg-turbo) doesn't provide a way to skip unneeded 19k scanlines without decoding them. Is there a workaround for it without digging into libjpeg internals? 回答1: Partial JPEG decoding was implemented in jpeglib-turbo one year ago. I didn't try it, but I guess it should work. Check

问题 I'm currently implementing a jpeg resizer in C++ using the jpeglib-turbo library. I've been given the target of 100 milli-seconds for JPEG decompression and recompression using the library. The best I can come up with using the recommended optimisation settings (documented in jpeglib-turbo usage.txt) is around 320ms, so I'm wondering is 100ms even possible/realistic? This would be to decompress/recompress an image of 3000x4000 px from around 6Mb in size to 130Kb. The code that I'm using for

问题 I have a question regarding DICOM standard and libjpeg library. In the DICOM standard, there are, among others, Transfer Syntax: JPEG Lossless, Nonhierarchical, First- Order Prediction (Processes 14 [Selection Value 1]): Default Transfer Syntax for Lossless JPEG Image Compression As far as I know, this Transfer Syntax corresponds with JPEG-1 Lossles format. I started researching libjpeg library and I found out that it doesn't support (?) Lossless JPEG, as stated here: JPEG Lossless in DICOM

问题 I am trying to do some image resizing on my Django application running on AWS Elastic beanstalk, so I am trying to install Pillow to do the job. As described in some previous posts, I am adding packages: yum: libjpeg-devel: '6b' at the top of my .ebextension/myapp.config My requirement.txt includes: Django==1.6.7 boto>=2.32.1 django-filter>=0.7 django-password-reset>=0.7 django-storages>=1.1.8 django-taggit==0.12 djangorestframework>=2.3.13 django-bootstrap3>=4.11.0 django-bootstrap3

问题 I work with a lot of monochrome image data and this morning I noticed that there appears to be a significant difference between the way libjpeg and the .Net jpeg codec handle monochrome data. It appears that a monochrome image saved at ANY quality setting using libjpeg and opened using the default .Net jpeg codec actually only loads with 16 different shades of gray and all intermediate shades are rendered as stippled. Here is the histogram of a smooth gradient saved by libjpeg and loaded by