On 29 September 2016 at 10:31, Petric Frank <pfr...@gmx.de> wrote: > Hello, > > > > i have a QGraphicsScenewhich i want to write to a file (*.png, ...). > > > > As documrmtation states i use the following: > > ------------------- cut --------------------------- > > QGraphicsScene scene; // previously filled > > QRectF rect = scene->sceneRect (); > > QImage img (rect.width () + 1, rect.height () + 1, QImage::Format_ARGB32); > > img.fill (QColor (Qt::white).rgb ()); > > QPainter p (&img); > > scene->render (&p); > > p.end (); > > img.save ("pict.png"); > > ------------------- cut --------------------------- > > > > But this does not work for bigger pictures. No error message. The viewer > simply tells that the generated *.png file are corrupted. > The scenes reqire a width of about 100000 pixels. > > > > After some searching in the web i found out the QImage (and QPixmap) seems > to have an internal limitation of about 32k x 32k.
Maybe render into SVG first? http://doc.qt.io/qt-5/qsvggenerator.html Chris > > > > The PNG-format does not have such a limitation. > > > > Any hints on how to export such a big scene to a PNG (or other) file ? > > > > > > Currently i use Qt 5.6.1 (Linux 64 Bit) and Qt 5.2 (Windows 7 64 Bit). > > Both hosts have 16 GB main memory. > > > > kind regards > > Petric > > > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest