The project is taken over by @amondot on amondot/contrast-homogenizer.
Contrast Homogenizer allows to apply the contrast stretching of the current layer to all visible layers in QGIS. Likely to be useful when you open several adjacent images as QGIS enhances the contrast of each image independently based on their histogram. So the rendering is not homogeneous. This plugin allows to have this homogeneity on display.
Copyright 2012-2016, CS Systèmes d'Information
Released by CS Systèmes d'Information (CS SI). CS is designer and integrator of mission-critical applications and systems in the fields of defence, security, space, aeronautics, energy and industry.
For more information, http://www.c-s.fr/.
Contrast Homogenizer is released under the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.