Category Archives: Hobbies and Other Interests
Tip, slow down a song for school play or for learning lyrics
Sometimes it would be great to be able to slow down a song. For example, for a school play the original song might be way too fast for presentation. Or you might want to learn the lyrics of your favorite … Continue reading
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Hugin, tool for creating panorama photos
Hugin is a good open source tool for creating panoramas of your overlapping photos of a scenary. Example: combining 3 sky photos Hugin contains several options for combining the images. The figure below is obtained after making manual alignment of … Continue reading
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DIY Star Chart (planisphere)
There are 2 great sources if you wish to create yor own star chart. Online planisphere tool Ready made Uncle Al’s Starwheels in Wikipedia: A planisphere is a star chart in the form of two adjustable disks that rotate on … Continue reading
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Using ImageMagick to reveal existence of hidden steganographic messages with DIY IM-simpleGUI tool
Tools used ImageMagick is a powerfull CLI tool for image processing. For different commands, see their www pages. The following commands are used in this blog: compare convert montage In addition ImageMagick contains image filters like Laplacian (IM, wikipedia), Sobel … Continue reading
Posted in Anvanced Tools, Audio and Video, DIY, Recommended Free Tools, Security Training, Awareness and Reports, Tests, Tips
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DIY Spectrometer, and notes on online Spectral Workbench
There exist several variations of DIY spectrometer by using CD or DVD as the main component (ie. generating the rainbow of colors by diffraction from the optical disk grooves). The output is a spectra, light intensity versus wavelength. In Wikipedia: … Continue reading
Posted in Android, Anvanced Tools, DIY, For Fun or Interest, Gadgets, Hobbies and Other Interests, Tests
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Registax, Tool for enhancing an astro image from set of images
It is possible to improve your sky photos by using stacking tool like Registax. The input needed is a set of repetitive photos. For Canon cameras, there exist modification called CHDK with an intervalometer script, with which it is staightforward … Continue reading
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Tools for Colors and Color names: “What Color”, SIHwheel, “Name That Color”
This blog is not about choosing the right color, but about identifying what color is being used. Some tools provide numeric RGB values, but there are some ways to get the nearby color name, as will be shown here. Getting … Continue reading
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