The most authoritative work on the color instabilities of films and papers is:

Henry Gilmore Wilhelm The Permanence and Care of Color Photographs, Preservation Publishing Company, Grinell, Iowa, USA, 1993

The full 20 chapter volume is available for downloading in PDF format from the web site without charge.

This book is essential reading for anyone who has to deal with older colour pictures. Henry Wilhelm is hereby thanked for granting permission to use the graphs in the first part of this help file and to quote from his book.

Some of methods used in CastCor are described in (in chronological order):

A. Rizzi, C. Gatta and D. Marini"Color Correction between Gray World and White Patch" <>, EI2002 IS T/SPIE's Electronic Imaging 2002, San José, California (USA), 20-25/01/02.

C. Gatta, A. Rizzi and D. Marini, "ACE: An Automatic Color Equalization Algorithm" <>, CGIV2002 IST First European Conference on Colour in Graphics, Imaging and Vision, University of Poitiers, France, April 2-5, 2002.

A. Rizzi, D. Marini, L. De Carli, "LUT and Multilevel Brownian Retinex Colour Correction", Machine Graphics and Vision, volume 11, no.2/3, 2002.

A. Rizzi, L. Rovati, D. Marini, F. Docchio, "Unsupervised Corrections of Unknown Chromatic Dominants using a Brownian Paths Based Retinex Algorithm", Journal of Electronic Imaging, Vol 12(3), July 2003.

A. Rizzi, C. Gatta, D. Marini, "A New Algorithm for Unsupervised Global and Local Color Correction <>", Pattern Recognition Letters, Vol 24 (11), pp. 1663-1677, July 2003.

G. Ciocca, D. Marini, A. Rizzi, R. Schettini, S. Zuffi, "Retinex Preprocessing of Uncalibrated Images for Color Based Image Retrieval", Journal of Electronic Imaging Vol 12(1), pp. 161-172, 2003.

D. Marini, A. Rizzi, M. Rossi, "Post-Filtering for Color Appearance in Synthetic Images Visualization", Journal of Electronic Imaging, Vol. 13, No. 1, January 2004.

A. Rizzi, C. Gatta, D. Marini, "From Retinex to ACE: Issues in Digital Images Unsupervised Color Equalization", Journal of Electronic Imaging, Vol. 13, No. 1, pp. 15.28, January 2004.

L. Meylan, S. Süsstrunk, ."Bio-inspired image enhancement for natural color images",. in IS&T/SPIE Electronic Imaging 2004. The Human Vision and Electronic Imaging IX, vol. 5292, San Jose, CA, January 2004, pp. 46.56.

Fabrizio Di Vittorio of HiComponents, Ladispoli, Italy is hereby thanked for implementing and adding a fast version of the ACE algorithm of Rizzi et al. and a modified version of the Meylan-Süsstrunk method to the HiComponents package at the author's request.

Rog Palmer of Airphoto Services, Cambridge, UK,  is herby thanked for testing the programme and making suggestions for its improvement.