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This image discripes how to create this chrome ball with GIMP. First of all you need a equirectangular panorama . If you don't have one you can get one from HDRI Haven . For this tutorial I took this one: https://hdrihaven.com/hdri/?h=bell_park_pier I chose the 8k version (8192x4096). This will give us enough pixel for the transformations. Now Open the image in GIMP and duplicate the layer. Flip the new layer vertical with the flip tool. You can switch from horizontal to vertical in the tool options or by pressing the Control key.  After that scale the layer with the scale tool down to 295 pixel height. Because reflection is never 100 percent lets darkens the image a little bit with Colors->Exposure... Now we will create the shadow. For the shadow we need to add new layer with transparent background. Make sure your foreground color is black. Then select the gradient tool and select the "FG to Transparent" gradient. The shape must be ...

A long time ago (2006) the German weekly news magazine "Der Spiegel" had an photo editing competition. According to The Economist, Der Spiegel is one of continental Europe's most influential magazines. The contest was to edit on of four images with Photoshop: https://www.spiegel.de/netzwelt/web/fotofaelscher-wettbewerb-wenn-tony-blair-brueste-wachsen-a-438042.html And then I won the contest with GIMP: https://www.spiegel.de/netzwelt/web/faelscher-wettbewerb-wie-der-wuestenmann-risse-bekam-a-442309.html Sadly all the images are removed from the original articles, even archive.org has not all the images archived: https://web.archive.org/web/20140111104015/https://www.spiegel.de/netzwelt/web/faelscher-wettbewerb-wie-der-wuestenmann-risse-bekam-a-442309.html Luckily I found the images on my hard disk. This was the photo, provides by "Der Spiegel", I chose to manipulate: This was the base image  for my manipulation: ...

I found some old images I made with GIMP on my old computer: Going shopping with an elephant:    How to hide an elephant: