color and appearance are among the first parameters perceived by consumers to judge the quality of foods. l*a*b* are used to report foods’ colors quantitatively. in this study the use of digital imaging and photoshop software was evaluated for measurement of l*, a* and b* color parameters. the results showed that l*, a*, and b* values from hunter colorimeter and the digital imaging method had a...

The term “color” can be used in two different ways. One way is to describe the subjective appearance of an object or a light source. The second way is to describe the physical characteristics of the stimulus. Throughout the last century attempts have been made to bridge these two domains with some, but not complete success. Perhaps a consequence of our inability to satisfactorily make this brid...

We describe a procedure for measuring total protein in urine. The method is simple, sensitive, and free of interference from drugs that are known to affect other commonly used methods. The CV for a 1.1 g/liter urine control in daily, routine use is 4.6%. The procedure involves adsorbing the protein onto cellulose powder, binding of Ponceau S dye by the protein, washing away excess dye, and elut...

The development of colorimetry and spectroscopy in the nineteenth century is described. An account is given of the application of their techniques to biological chemistry during that period.

As part of our ongoing research into the clear daytime sky's visible structure, we analyze over 1,500 skylight spectra measured during a seven-month period in Granada, Spain. We use spectral radiances measured within 3 degrees fields of view (FOV's) to define colorimetric characteristics along four sky meridians: the solar meridian and three meridians at azimuths of 45 degrees, 90 degrees, and ...

A simple, rapid colorimetry for DNA detection based on non-aggregated gold nanoparticles and magnetic beads has been developed with high selectivity and sensitivity.

CIE colorimetry was standardised 65 years ago to describe colorimetric properties of signal lights. The first real application of CIE colorimetry occurred, however, in the textile and coating industries to describe colour matches between sample and reference. Thus also the experiments conducted to achieve a uniform colour scale diagram were performed by using material samples usually illuminate...

The physical properties of color are usually described by their spectra, eigenvector expansions or low-dimensional descriptors such as RGB or CIE-Lab. In the first part of the paper we show that many of the traditional methods can be unified in a framework where color spectra are elements of an infinite-dimensional Hilbert space that are described by projections onto low-dimensional spaces. We ...