We present a combined study of the colour–magnitude relation, colour distribution and luminosity function of a sample of 24 clusters at redshifts 0.3 < z < 1. The sample is largely composed of X–ray selected/detected clusters. Most of the clusters at redshifts z < 0.6 display X–ray luminosity or richness typical of poor clusters or groups, rather than the more typical, massive clusters studied ...

An improved method for visual gamma correction is developed for LCD displays to increase the accuracy of digital colour reproduction. Rather than utilising a photometric measurement device, we use observers’ visual luminance judgements for gamma correction. Eight half tone patterns were designed to generate relative luminances from 1/9 to 8/9 for each colour channel. A psychophysical experiment...

Diffusion-tensor data from medical MR imaging consists of a 3 × 3 symmetric positive semi-definite matrix at each voxel. The issue of how to understand, and how to meaningfully display this type of data has been gaining interest since its development as a noninvasive investigative tool [1]. Several schemes have been developed, usually aimed at the display of the spatial geometric structure of e...

Colloidal quantum dot white light-emitting diode has received much attention for ambient lighting, photonics and display. Efficient colour toning is demonstrated by hybridising Perovskite Chalcopyrite as a single electroluminescence layer.

Rapid colour change is a remarkable natural phenomenon that has evolved in several vertebrate and invertebrate lineages. The two principal explanations for the evolution of this adaptive strategy are (1) natural selection for crypsis (camouflage) against a range of different backgrounds and (2) selection for conspicuous social signals that maximise detectability to conspecifics, yet minimise ex...

Interest in the colour of fruits eaten by vertebrates has a long history (Ridley 1930, Turcek 1963, van der Pijl 1972). Within a given geographical area, colours of birdconsumed fruits compared with mammal-consumed fruits are fairly consistent (Janson 1983, Wheelwright & Janson 1985, Willson & Whelan 1990), but comparisons among different regions reveal selective pressures of different animal g...

I describe a colour scheme that is appropriate for the screen display of intensity images. This – unlike many currently available schemes – is designed to be monotonically increasing in terms of its perceived brightness. Also, when printed on a black and white postscript printer, the scheme results in a greyscale with monotonically increasing brightness. This scheme has recently been incorporat...

Particle systems make an excellent tool for creating tracks (which we call strokes) in vector fields. The question addressed in this paper is how such tracks should be made to vary in size and colour in order to reveal properties such as local direction and strength of the field. We find that for strokes that vary from large to small, direction is indicated by the large end. We also find that f...

Dynamic, colour-changing surfaces have many applications including displays, wearables and active camouflage. Plasmonic nanostructures can fill this role by having the advantages of ultra-small pixels, high reflectivity and post-fabrication tuning through control of the surrounding media. However, previous reports of post-fabrication tuning have yet to cover a full red-green-blue (RGB) colour b...