Thats what I thought as well. I dont really get why they coloured them. The destroyer with the stripes seems to be quite camouflaged in black and white, it disrupts its shape. I understand that camouflage colours wouldn't work all the time, but orange and purple?!
"Dazzle's effectiveness is not certain. The British Admiralty concluded it had no effect on submarine attacks, but proved to be a morale boost for crews. It also increased the morale of people not involved in fighting; hundreds of wonderfully coloured ships in dock was nothing ever seen before or since."