Convert image from jpg tp png

[mina samy]

Hello every one
i want to convert image from jpg to png format !!!
any suggestions!!!

thanks

[jsmith]

First decompress the jpg, then recompress the image using the png algorithm.

[tummychow]

Look it up. This is a programming forum, and even if this is for some kind of program we don't have *all* the answers.

[mina samy]

thanks jsmith


tummychow:
I think i am asking in the right place as i ask for a [b]programming guide[/b]

[tummychow]

Well we don't have the libraries... have you checked online?

[helios]

You can do what jsmith suggested using libjpeg and libpng. There are also some image manipulation libraries around (e.g. ImageMagick, FreeImage), which let you load and save with only a few function calls.

[PanGalactic]

Boost GIL rocks for this:

#include "boost/gil/gil_all.hpp"
#include "boost/gil/extension/io/jpeg_io.hpp"
#include "boost/gil/extension/io/png_io.hpp"

int main(int argc, char* argv[])
{
    if (argc < 3) return 1;

    using namespace boost::gil;
    rgb8_image_t im;

    jpeg_read_image(argv[1], im);
    png_write_view(argv[2], view(im));
    return 0;
}

make "LDFLAGS=-lpng -ljpeg" gil

[tummychow]

That is pretty awesome.
There is also a utility on sourceforge called optipng which converts bmps to pngs.