demonstrating a variety of layering/filtering
((( using gimp-2.4.5 in debian stable,,, (((f|s|avouring retinex))),,,)))

http://www.jwm-art.net/zen_mtb/images/mtb_component_composition2.png
http://www.jwm-art.net/zen_mtb/images/bars-colours.png
http://www.jwm-art.net/zen_mtb/images/stood-over.png
http://www.jwm-art.net/zen_mtb/images/big-gear.png

all around 2meg in file-size

big gear is imaginary painting, bar colours was attempt at, component
composition is tempory-(used&worn-parts-dismantled)-object-art digitally
captured/manipulated. stood-over is noise