libjpeg

问题 my application uses libjpeg to read/write JPEG-images. everything worked fine recently my app started to crash when trying to write JPEG images with an error "Wrong JPEG library version: library is 80, caller expects 62" when calling jpeg_create_compress() (so the crash seems to be an intentional abort on the libjpeg side rather than a segfault) a bit of investigation showed that indeed my application was compiled against libjpeg-62 headers (that were installed in /usr/local/include) and was

问题 I'm trying to install PIL on Snow Leopard, using Python 2.6.1, GCC 4.2.1, PIL 1.1.7, and have tried with both libjpeg6b and libjpeg7 -- nothing works. I've cleared out every trace of libjpeg/pil/zlib from fink, tried various compiler options, etc. and used http://jetfar.com/libjpeg-and-python-imaging-pil-on-snow-leopard/ and http:// www.brambraakman.com/blog/comments/installing_pil_in_snow_leopard_jpeg_resync_to_restart_error/ (not a link because StOv only lets me post one...) 4 bits of

问题 So I have this problem. I have an IplImage that i want to compress to JPEG and do something with it. I use libjpeg8b.The code exit when it goes the function of jpeg_start_compress() with an error of "Bogus input colorspace" .Here are my code. #include "highgui.h" #include <stdio.h> #include "jpeglib.h" #include "cv.h" #include <iostream> #include <fstream> using namespace std; using namespace cv; #pragma comment(lib, "jpeglib.lib") bool ipl2jpeg(IplImage *frame, unsigned char **outbuffer,

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am having trouble finding an API that details functions calls and return values... The headers aren't exactly very clean either... I have found tons of examples, but I'm interested in error handling (return values). Am I approaching this wrong because I'm tearing my hair out trying to find something as basic

问题 This question/answer will eventually serve as complete answer for this question: How can I manipulate/rotate a JPEG image in C++? Since the answers given to that question are only useful if you have already done all of this below. I followed the guide here: Compiling libjpeg (The accepted answer guide using MINGW32 Shell) It doesn't work despite having downloaded a fresh copy: $ make make all-am make[1]: Entering directory `/c/tmp/jpeg-9' CC jaricom.lo CC jcapimin.lo jcapimin.c:127:1: error:

问题 Does libjpeg allows/have routines to scale the output image? I have an image which needs to be resized when saving to and loading from, Providing width1, height1 on input and getting width2, height2 on output, and I really cant use anything outside. 回答1: Yes, libjpeg does support image scaling, but with some limitations. Libjpeg version 8c and higher supports M/8 scaling where M is an integer between 1 and 16. The more commonly used libjpeg version 6b supports M of 1, 2, 4, and 8 only (i.e.

问题 Ater compiling libjpeg and then using it, I stumbled upon the problem: JPEG parameter struct mismatch: library thinks size is 512, caller expects 492 after which the program halts. This happens specifically with the structs struct jpeg_decompress_struct and struct jpeg_compress_struct . If the checks are removed on these structs, the program crashes with a null pointer exception, and the struct members contain garbage. The error occurs with either precompiled binaries from version 6b, or with

问题 See bottom for updates I am running into a number of odd problems. For starters, I'm using the latest Eclipse CDT and before implementing do_rot_180 , the compiler linked the folder projectName/include but after it now requires specific include/*.h specified below. Related to that issue, in the project explorer, it seems to think libjpeg.h is missing or invalid despite it being in the folder on the disk. I am working with libjpeg-9. Includes (included what transupp.c and example.c included):

问题 So I have this problem. I have an IplImage that i want to compress to JPEG and do something with it. I use libjpeg. I found a lot of answers "read through examples and docs" and such and did that. And successfully written a function for that. FILE* convert2jpeg(IplImage* frame) { FILE* outstream = NULL; outstream=malloc(frame->imageSize*frame->nChannels*sizeof(char)) unsigned char *outdata = (uchar *) frame->imageData; struct jpeg_error_mgr jerr; struct jpeg_compress_struct cinfo; int row

问题 I'd like to use the compiled libjpeg-9 example.c and transupp.c code and libraries to rotate a .jpg image in an Eclipse project. Working progress on achieving this from the start: Compiling/using libjpeg in Windows for Eclipse Trying to integrate do_rot_180 and read/write functions into one location: Need help compiling jpegtran.c code from libjpeg 回答1: do_rot_180 function in transupp.c in libjpeg (you are aware of it as the Q has the tag) is doing exactly what you want. LOCAL(void) do_rot