In one of my first posts – “How Much Light Is Needed Inside the Camera?” – I showed you what a good exposure is by displaying three images taken from the same point with different exposures (in fact it was … Continue reading
As a general definition, the histogram is a graphical representation of the distribution of data. “What distribution of data?” you may ask. Well, in a digital camera, like in a computer, an image is just data! I know, this may … Continue reading
The CIE XYZ color space [1] defines all colors in terms of three imaginary primaries X, Y, and Z based on the human visual system that possess the following properties: Based on experimental data of human color matching; X, Y, … Continue reading
Color perception is a brain process that starts in the eye’s cone receptors. These receptors are found in three varieties that exhibit sensitivity to approximately red, green, and blue colors. The separation between colors is not clean and there is … Continue reading
The human eye is an incredibly complex detector of electromagnetic radiation with wavelengths between 380 to 770 nm. The sensitivity of the eye to light varies with wavelength (see the CIE photometric curve for the day vision – V(λ) – … Continue reading
There are many books and papers dedicated to the study of light from different perspectives: the artist, the scientist, the designer, the historian or the biologist. There is no point in repeating here what the literature provides in abundance. The … Continue reading