JPG format

[Roberto Mendoza]

Hello,
I want to read JPG images to use their bitmaps.
Anybody knows something about this graphic format?
I need some code or specifications

Thanks

[jim mcnamara]

jpeg format: search for jpeg or jpg at www.wotsit.org

Opinion: you're better off using somebody else's COM object.
VB 6 comes with Kodak ImgEdit, and MS Photoshop has jpeg1x32.dll and jpeg2x32.dll support for jpeg processing.

[jim mcnamara]

Also try here for a lot of sample code - some VB some C++

http://www.eistream.com/support_pro/...ample_code.htm

[transcendental]

Writing a routine to open JPG files is no joke.

These past few days, I happened to be reading a 47KB text file on JPG from wosit.org. I am halfway finished. What a long file.

This text file only covered one type of the 3 jpg compressions, sigh....(The author say it is better to explain the JPG compression so as to understand decompression). Actually I only need that decompression part only.

I have not yet come to the part where it explains the file format, only the compression part finished. I hope to finish reading that text file tonight.

After reading the beginning part a few times, I more or less understand what it is trying to say. I have some unsure questions regarding the text which I have no one to ask.

To decompress the file, you have to decode a continuous string of bits(Not bytes). Bits decoding, anyone?Huffman coding?

I am sure I can do the bits decoding(Just give my routines half an hour to open that JPG file if I ever succeed in writing them, j/k). It is some parts in the text which I am unclear, had me worrying about programming.

If I am 100% clear, I can solve whatever programming problem,but just give my routines half an hour to open one jpg file.j/k

Anyway, Roberto, is there anyway you can use GDI+? I heard GDI+ support opening jpg files. Sigh, me using win98 first edition.

Or return to VB's Image control or picturebox control.

"*knock* *knock*, huh? this is a C++ forum."

Just my 2 cents.

[Smithy006]

Hi Rob,

Check out the Intel Jpeg Library

http://developer.intel.com/software/...s/perflib/ijl/

This will be a great help in opening/manipulating jpegs etc.

Best Regards,

Ben Smith.