Talk:CYGM filter

Why green?

The article needs an explanation of why the filter for the primary color green is included in the CYGM filter. (The logical alternative to the primary color RGB filter, seems to be a secondary color CMY filter?)

Abu ari 13:32, 22 August 2006 (UTC)

Comparing CYGM and RGBG sensitivity

Currently the article states: "CYGM gives more accurate luminance information than the Bayer filter, hence a wider dynamic range, but at the expense of colour accuracy."

1. Sensitivity & Dynamic Range : If the CYGM filter dyes are less absorptive than RGB dyes, a CYGM filter array allows more light to reach the sensor. In effect, a CYGM-camera should be "more sensitive" than an equivalent RGB-camera. The dynamic range of a sensor depends on its full well capacity (white clip) relative to its acceptable dark noise SNR (black clip). Simply increasing the amount of light hitting the sensor does not increase its dynamic range; whilst overexposing improves shadow detail (SNR), it simultaneously reduces highlight detail (white clipping). --87.102.115.60 (talk) 15:40, 15 January 2009 (UTC)

2. Color Accuracy: Does "more accurate luminance information ... at the expense of colour accuracy" mean more Luminance sensitivity at the expense of colour accuracy? Surely the point of using CYGM (as opposed to CMYK, where K would be Luminance) is to obtain greater colour accuracy in the red-green axis, and use that info to make CMY encoded colours more accurate? Luminance values for both RGBG and CYGM are inferred from a colour matrix; only a YCC or CMYK matrix of some kind would actually sample Luminance directly...? --87.102.115.60 (talk) 15:40, 15 January 2009 (UTC)