N 0 is the size of the population at the beginning of time t . What could have happened biologically in fig. MARK is windows-based and throroughly documented online. NIH Image is a public domain image processing and analysis program for the Macintosh. A free PC version of Image, called Scion Image for Windows, is available from Scion Corporation.
Image can acquire, display, edit, enhance, analyze and animate images.
It reads and writes TIFF, PICT, PICS and MacPaint files, providing compatibility with many other applications, including programs for scanning, processing, editing, publishing and analyzing images. It supports many standard image processing functions, including contrast enhancement, density profiling, smoothing, sharpening, edge detection, median filtering, and spatial convolution with user defined kernels. Image can be used to measure area, mean, centroid, perimeter, etc. of user defined regions of interest. It also performs automated particle analysis and provides tools for measuring path lengths and angles. Spatial calibration is supported to provide real world area and length measurements.