Ultraviolet photograph looking down into the centre of a tulip flower.
In visible light the flower's petals appear a medium toned purple colour, with a light yellow area at the base. This contrasts with the flower's appearance in UV, where the petals are a much darker single tone. The anthers also appear darker in ultraviolet than they do in visible light. The stigma is quite bright, but with dark edges.
Channel mixer and hue adjustment used in PS CC to modify colours