Abstract of INFO-MAC archived encoded Mac binary file
   'dev/video-toolbox.hqx'
  Uploaded 07/05/2000   2807652 bytes

From: Denis Pelli <denis@xp.psych.nyu.edu>
Subject: video-toolbox-00-06-22-c.sit

The VideoToolbox <http://vision.nyu.edu/VideoToolbox/> is a collection of 
two hundred C subroutines and several demo and utility programs that I 
and others have written to do visual psychophysics with Macintosh 
computers. It's fully compatible with 68K and PowerPC Macs and with 
Metrowerks CodeWarrior and Symantec C compilers. It's free and may not be 
sold without permission. It should be useful to anyone who wants to 
present accurately specified visual stimuli or use the Mac for 
psychometric experiments. The Video synch page discusses all the ways of 
synchronizing programs to video displays and the many pitfalls to avoid. 
The TimeVideo application checks out the timing of all video devices in 
anticipation of their use in critical real-time applications, e.g. movies 
or lookup table animation. Video synch reports all known bugs uncovered 
by TimeVideo's testing of 56 video cards and drivers. Low-level routines 
control video timing and lookup tables, display real-time movies, and 
implement the luminance-control algorithms suggested by Pelli and Zhang 
(1991). In particular, CopyWindows (or CopyBitsQuickly) faithfully copies 
between on-screen and off-screen windows (or bit/pixmaps), WindowToEPS 
saves an image to disk as encapsulated PostScript, for later printing or 
incorporation into a document, and SetEntriesQuickly and GDSetEntries 
load the screen's color lookup table, all without any of QuickDraw's 
color translations. NoisePdfFill.c quickly generates visual noise images 
whose pixels are samples from a specified probability density function. 
High-level routines help analyze psychophysical experiments (e.g. 
maximum-likelihood fitting and graphing of psychometric data). Assign.c 
is a runtime C interpreter for C assignment statements, which is useful 
for controlling experiments and sharing calibration data. This collection 
has been continually updated since 1991. Nearly two hundred colleagues 
subscribe to the email distribution (see below), and have indicated that 
they are using the software in their labs. Documentation is in the source 
files themselves. Many of the routines are Mac-specific, but some very 
useful routines, e.g. the luminance-control, statistics, 
maximum-likelihood fitting algorithms, and the runtime interpreter are 
written in Standard C and will work on any computer. Those wishing to 
acknowledge use of the VideoToolbox software might cite:
Pelli, D.G. (1997) The VideoToolbox software for visual psychophysics: 
Transforming numbers into movies. Spatial Vision 10:437-442

Denis Pelli, Professor of Psycholoyg and Neural Science at NYU

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