Author Archives: michael

(*********************************************************************** Mathematica-Compatible Notebook This notebook can be used on any computer system with Mathematica 4.0, MathReader 4.0, or any compatible application. The data for the notebook starts with the line containing stars above. To get the notebook into a Mathematica-compatible … Continue reading →

Linux includes a command called time, which rather than reporting the current time (that’s “date”), is a kind of meta command that can be used to measure the resource usage of the execution of another command. Running the hash index … Continue reading →

An archive is an organic whole In de vorige paragraaf is uiteengezet hoe een archief ontstaat ten gevolge van de werkzaamheden van een college of een ambtenaar, hoe het archief altijd de neerslag is der functiën van dat college of … Continue reading →

No matter how good the scheme, its scope is limited by the fact that data entry is never an easy task, and there are never enough resources or trained personnel to make it happen. Not only will there inevitably be … Continue reading →

The Gnome Disk Usage Analyzer (aka baobab) tool provides a means of graphically representing the contents and relative sizes of files on a hard drive. In this case the visualisation is a Treemap.

du -h (disk usage, with “human” option) is a very basic and common tool for interrogation of the data stored on a hard drive. It simply dumps a list of the names of files and folders, with the amount of … Continue reading →

MPEG movies, when compressed, analyze the movement of pixel data and use “motion vectors” to help achieve data compression. Movie players, like mplayer, support showing this data as a “debugging” feature. This blog post discusses the mplayer feature, and here … Continue reading →

Tweaked the spreadsheet script to use PIL to resize the thumbnail images to a single pixel giving a rough impression of the average color of the image, then convert this to HSV for hue, saturation, and lightness values. Resulting images … Continue reading →

We start working on the contents of the folder “kuvia” — Finnish for images — and just one of several folders of images. Of the approximately 17000 images, 12000 have EXIF data (straight from a digital camera). I write a … Continue reading →

Working with the pyexiv2 library, discovered that images from digital camera’s typically have an embedded thumbnail image, available via standard metadata (EXIF) that is included within the image itself. Work with thumbnail images generated by the camera is interestesting in … Continue reading →