Try zopflipng ...

If the increased image memory is payed only when the dialog is shown i don't see it as a problem tbh.

Funny story: after multiple attempts to use Inkscape to make an SVG of this, all versions were much larger than the new png! I don't think that's an option. @broulik, does the current approach look sane to you? I wasn't able to make it work simply adding an @2x image without code changes.

If the increased image memory is payed only when the dialog is shown i don't see it as a problem tbh.

Well, it's compiled into .qrc and potentially shipped for bundled applications? The RAM will be shared, I guess? I don't really know how this qt resource stuff works :)

Whatever the size/memory penalty is, I'm not sure we can get around paying it since the vector approach was a no-go. I tried my best to reduce the size of the image as much as possible, at least.

I have traced the image with GIMPs selection tool, "convert selection to path" and export path as SVG. IMHO works best for tracing pixel art.

Thanks! But where seems to be something wrong with that SVG. Qt complains when I try to load it into a QPixmap:

couldn't create image from  "file:///home/sbruens/Downloads/aboutkde_doubled2.png"

Looking inside the SVG file itself, I see the following:

<image
   sodipodi:absref="/home/sbruens/Downloads/aboutkde_doubled2.png"
   y="0.000955912"
   x="-0.000238418"
   id="image946"
   xlink:href="file:///home/sbruens/Downloads/aboutkde_doubled2.png"
   preserveAspectRatio="none"
   height="749.999"
   width="449.999" />

In D14237#299794, @ngraham wrote:

     <image
        sodipodi:absref="/home/sbruens/Downloads/aboutkde_doubled2.png"
...
        width="449.999" />

Just delete the image element from the SVG and you should be good.

In D14237#299303, @bruns wrote:

I have traced the image with GIMPs selection tool, "convert selection to path" and export path as SVG.

If I understand it correctly, the SVG only contains the outline of the selection, but not the actual colors. What I see is just a black silhouette.

Does someone from the VDG use professional tools that are able to trace to SVG?

In D14237#309615, @cfeck wrote:

In D14237#299303, @bruns wrote:

I have traced the image with GIMPs selection tool, "convert selection to path" and export path as SVG.

If I understand it correctly, the SVG only contains the outline of the selection, but not the actual colors. What I see is just a black silhouette.

The outline exported from the GIMP is just an outline. The SVG I attached are all outlines properly stacked and filled.

If you see only an outline, your SVG viewer is broken. Try opening it in Inkscape.

My viewer is QtSVG.

Works fine in Inkscape, Gwenview, ShowFoto, Konqueror (KHTML mode) ...

Minimal working application:

#include <QIcon>
#include <QGuiApplication>

int main(int argc, char* argv[])
{
  QGuiApplication app(argc, argv);

  QIcon icon(QStringLiteral("./konqui.svg"));
  QPixmap pixmap = icon.pixmap(64, 64);

  pixmap.save("./konqui.png");
}

There was some cruft in the file (empty layers, unused definitions ...)

Ping, is this good to go now?

+1, but I haven't tested it.

@broulik , @cfeck - your opinion?