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Combining two images with ImageMagick
To combine two images of the same size with ImageMagick, you simply do the following: The following will overlay overlay.png on top of output.png mogrify -draw "image SrcOver 0,0 0,0 ‘overlay.png’" output.pngmogrify -draw "image SrcOver 0,0 0,0 ‘overlay.png’"…
Read More »Selective colour replacement with imagemagick
Selective colour replacement is easy from the command line with imagemagick. You can download imagemagick from http://www.imagemagick.org/ The following will replace all red (#FF0000) pixels with blue (#0000FF) convert sourceimage.png -fill "#FF0000" -opaque "#0000FF" destimage.pngconvert sourceimage.png -fill "#FF0000"…
Read More »WordPress Super Cache plugin – Performance Benchmarking
I’ve been doing some performance tests on WordPress to see how much of a difference the WordPress Super Cache plugin made. It turns out that the plugin makes a huge difference.
Read More »Bear with me while I change servers
I’ve taken the plunge, and this time I’m not doing it by halves. I’m moving from my Windows Server 2003 physical co-located server to a Virtual Private Server (VPS) running Linux. All of the websites have been transferred…
Read More »Live Renders of Earth
I’ve recently come across the open source software Xplanet, which will render images of the globe with very realistic results. I render them in 512×256, 1024×512, 2048×1024 and 4096×2048 resolutions. The clouds information is obtained from weather satellites…
Read More »12 November 1969 – Today in Apollo History
Apollo 12 stories from Newspapers on the 12th November 1969.
Read More »I'm tweeting the Apollo 12 landing… 40 years late
Just like I did with the Apollo 11 landing, I’m tweeting the Apollo 12 landing 40 years late. I’m using the same account so you can find all the tweets at http://www.twitter.com/apolloecho.
Read More »10 November 1969 – Today in History
Apollo 12 stories from Newspapers on the 10th November 1969.
Read More »My first "real" attempt at Kite Aerial Photography (KAP)
Although I’ve done my bit of Aerial Photography, I’ve always wanted to give Kite Aerial Photography (KAP) a go. Back in September I started to acquire a few bits. Since the main component was a kite, I decided…
Read More »Help Noah Biorkman enjoy his early Christmas
Five year old Noah Biorkman from Michigan, USA is celebrating Christmas this weekend. The reason santa is coming early this year is that Noah is in the finals stages of cancer that he has been fighting since he…
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