libjpeg

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libjpeg ver. 6b jpeg_stdio_src vs jpeg_mem_src

I am using Libjpeg version 6b. In version 8 they have a nice function to read data out of the memory called jpeg_mem_src(...), unfortunately ver. 6b does not have this function.[详细]

2023-02-16 14:38 分类：问答
Get compression ratio of image

I use LibJPEG to read JPEG compressed images. Is there a way to get the current compression ratio of the unchang开发者_如何学Goed image?Do you mean the encoding quality, usually a number 0-100?[详细]

2023-02-07 13:50 分类：问答
write a jpeg with libjpeg (seg fault)

Trying to write a jpeg file from some raw data using libjpeg. It triggers a Segmentation Fault in jpeg_start_compress()[详细]

2023-02-03 13:37 分类：问答
Write to memory buffer instead of file with libjpeg?

I have found this function which uses libjpeg to write to a file: int write_jpeg_file( char *filename )[详细]

2023-02-01 22:50 分类：问答
How to compile LibJpeg in universal binary in Mac OSX 10.4

I want to compile jpeg-8b in universal binary (ppc,i386). It should be supported in 10.4 and later OSs.I could do it in 10.5 and 10.6, but the binary is not compatible with 10.4. Thus I tried to compi[详细]

2023-01-30 17:25 分类：问答
opengl pixel data to jpeg

Any C++ examples available to convert raw pixel data obtained from开发者_开发问答 glReadPixels to JPEG format and back?You can use ImageMagick library to convert raw data to the jpeg image data, and o[详细]

2023-01-26 04:32 分类：问答
alternatives to jpeg_read_header libjpeg

So I\'m running into an issue using libjpeg on Windows which causes jpeg_read_header() to crash. The problem is (fairly hilariously) described here: http://sourceforge.net/projects/gnuwin32/forums/f[详细]

2023-01-23 04:20 分类：问答
Libjpeg error - improper call in state 205

I\'m using libjpeg (C/C++ programming on Windows Mobile 6.5), in order to decode images from an IP camera (sent in a MJPEG stream), before pushing them into a DirectShow graph.[详细]

2023-01-21 15:16 分类：问答
Pointer alignment in libjpeg

From jmorecfg.h: #define PACK_TWO_PIXELS(l,r)((r<<16) | l) #define PACK_NEED_ALIGNMENT(ptr) (((int)(ptr))&3)[详细]

2023-01-17 14:18 分类：问答
Installing PIL on Snow Leopard -- NOTHING WORKS

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/zli[详细]

2023-01-06 22:50 分类：问答