zadanie 15
loop image.width #x: if image.pixelColor(x,image.height)==colors.black: loop image.height #y: if image.pixelColor(image.width,y)==colors.black: image.pixelColor(x,y)=colors.black
zadanie 17
loop image.width #x: loop image.height #y: if x>=y: image.pixelColor(x,y)=image.pixelColor(x,image.height)