PENTAX IMAGES before and after black&white

Pentax *ist DS images,before and after filter effects,lens 18+55mm DA,camera mode aperture priority,aperture f8,sensitivity 200,multi segment metering,white balance manual,photo 1 normal shutter speed 1/500sec,photo 2 yellow/green filter shutter speed 1/180sec,photo 3 yellow/orange shutter speed1/250sec,photo 3 tri color red shutter speed 1/90sec,all black and white photos the gimp channel mixer mono chrome,no mixing.