There are some large differences in color profile apparently between:
original: http://upload.wikimedia.org/wikipedia/commons/c/c7/Theridula_emertoni_Kaldari_02.jpg
thumb: http://commons.wikimedia.org/wiki/File:Theridula_emertoni_Kaldari_02.jpg
Possibly caused by usage of -thumbnail in phase3/includes/media/Bitmap.php
Thumbnail is actually a combination of -resize and -strip. The latter removes profile AND metadata. Perhaps we should not strip if target thumb size is larger than say 400x300 ?