Analysis of the Black and White Image Recording of the Converted RGB Photographic Image

A digital camera is generally used for digital recording of photographic images in the RGB system. When such a multicoloured photographic image is converted to black and white using the standard Grayscale conversion in Adobe Photoshop, the colour information, expressed as R, G and B channel values, is lost. This paper analyses the darkening caused by different conversions of the RGB record of a photographic image to a black and white image record. The conversions were performed on three photos, with 10 random colours separated for each photo before conversion. After conversion, the L parameter, which indicates the brightness value, was analysed. The changes in the L parameter due to different methods of photo conversion from multicolour to black and white, such as desaturation, extraction of the R channel, extraction of the G channel and extraction of the B channel, were also analysed.