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--- en:documentation:observatory [2025/08/20 14:38] – [Use an horizon picture] dokuadmin
+++ en:documentation:observatory [2025/08/20 15:19] (current) – [Use an horizon picture] dokuadmin
@@ Line 119: / Line 119: @@
 Select a moment you get the most uniform lighting in every direction. A uniform high cloud cover can be good.\\
 Get a sequence of picture for the whole horizon, be sure to have enough overlap between the pictures.\\
-Use a panorama software like [[http://hugin.sourceforge.net/|Hugin]] to assemble the pictures. Convert the result to PNG format to support transparency. Then use [[http://www.gimp.org/|GIMP]] to set the sky transparent using one of the [[https://www.google.com/#q=gimp+mask+transparency|numerous method]] available, I found that creating a sky mask first work fine.\\
+Use a panorama software like [[http://hugin.sourceforge.net/|Hugin]] to assemble the pictures. Convert the result to PNG format to support transparency. Then use [[http://www.gimp.org/|GIMP]] to set the sky transparent using one of the [[https://www.google.com/search?q=gimp+mask+transparency|numerous method]] available, I found that creating a sky mask first work fine.\\
 Finally reduce the panorama size to a reasonable value, 4096 or 8192 pixel width.
-If you observe from a mountainous area I also get success by using an [[http://www.udeuschle.de/Panoramen.html| online panorama generator]]. In the form set your coordinates and "Left edge=90", "Right edge=90", "Tilt=0", "Elev. exaggeration=1". Show the panorama, save all the tiles and assemble in GIMP or using the "montage" command from ImageMagick.
+For mountainous area it possible to use an [[panorama| online panorama generator]].\\
+The condition is the horizon is limited by remote mountain, this not work for tree or nearby buildings.
+{{:en:documentation:horizon4.png?600|}}