Re: [png-mng-implement] Looking for a PNG to test

[Alexander S. <ale...@gm...>]

On Sun, Sep 14, 2008 at 5:58 PM, Adrian McMenamin
<ad...@ne...> wrote:
> I would like an interlaced but not filtered 8- or 16-bit truecolour PNG
> - there doesn't seem to be such a thing in the test suite.
>
> Anyone have one they can email me or point me to?

No one replied so far, so let me jump in. :-)

Attached is an 8-bit truecolor interlaced PNG with _default_ filtering
(don't know what did you mean by "not filtered").

The file was created with the aid of png++, the C++ wrapper for libpng
using the following simple program:

$ cat create-interlaced-png.cpp
#include <png.hpp>

int
main()
{
  png::image< png::rgb_pixel > image(64, 64);
  for (size_t y = 0; y < image.get_height(); ++y)
    {
      for (size_t x = 0; x < image.get_width(); ++x)
        {
          image[y][x] = png::rgb_pixel(x*4, 255 - y*4, x*y / 16); //
let's have some nice color pattern ;)
        }
    }
  image.set_interlace_type(png::interlace_adam7);
  image.write("interlaced-truecolor.png");
}
$ g++ create-interlaced-png.cpp -I /home/shulz/src/png++/ -lpng
$ ./a.out
$ file interlaced-truecolor.png
interlaced-truecolor.png: PNG image, 64 x 64, 8-bit/color RGB, interlaced
$

Hope this is what you needed. :-)

--
Cheers,
Alex