Technical Journal, Vol. 20 No. 1, 2026.
Original scientific paper
https://doi.org/10.31803/tg-20240717132537
Analysis of the Black and White Image Recording of the Converted RGB Photographic Image
Darija Ćutić
; University of Applied Sciences Zagreb, Vrbik 8, 10000 Zagreb, Croatia
Miroslav Mikota
; University of Zagreb Faculty of Graphic Arts, Getaldićeva ulica 2, 10000 Zagreb, Croatia
*
Maja Turčić
orcid.org/0000-0002-7733-3327
; University of Applied Sciences Zagreb, Vrbik 8, 10000 Zagreb, Croatia
* Corresponding author.
Abstract
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.
Keywords
black and white image; Grayscale system; L parameter; photo conversion; RGB system
Hrčak ID:
344753
URI
Publication date:
13.3.2026.
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