Figure 6 Video-level control regions, where the Lens opening, Gain, Exposure time, and Integration time are shown as related to the Luminance input (more light in the right direction).
Clearly, brightness is monotonically related to luminance in the simplest case: the more luminant the stimulus is, the brighter it appears to be.
Relative to the initial calibration procedure described in Experiment 1, when the lighter background was used most observers required more green luminance to match the red across the visual field.
In a second series of experiments the SR effects on the visual system were studied by using a more standard luminance-defined first order stimulus than the ones used in [10], [11].
For example, chroma subsampling reduces the amount of bandwidth allocated to the color channels, since the human eye is much more sensitive to luminance (brightness) than it is to chrominance (color).
However, imagery generation seems to be more sensitive to luminance, as lower levels of luminance had greater effects on generation compared to the memory trace.
Furthermore, imagery generation seems to be more sensitive to luminance than imagery storage, as even the lowest amount of background luminance during imagery generation caused a significant decrease in imagery priming.
We also notice that radiance (in units of W sr−1 m−2) is even more suitable than luminance (in units of cd m−2) to quantify the brightness of red to near-infrared persistent phosphors for the in vivo imaging application.
In fact, recent tests conducted at dpreview.com concluded that the new 15-megapixel Canon EOS 50D ($1,400) "shows visibly more chroma and luminance noise," and slightly less dynamic range, than the older 10-megapixel Canon EOS 40D ($920).
We found that increasing PTM dimensionality has a substantial effect on accuracy, more for the luminance channel than for colour.
