Gwyddion ‘phenomenal’ for philatelists
Since its 2004 launch, the free image data processing program Gwyddion has drawn the attention of philatelists for its powerful ability to uncover some of a stamp’s hidden elements. Czech researchers David Nečas and Petr Klapetek developed the program – free to download on gwyddion.net – which can transform engraved and embossed stamps into three-dimensional images. It... Continue reading →