olemus
ISO/IEC 19794:
vajalik bittide arv andmeeelemendi või andmikuparameetri esituseks
= number of bits used to represent a data element,
the number of bits used to represent a data record parameter
ISO/IEC 23002 (MPEG):
täisarvväärtuse esituseks vajalik bittide arv
= amount of data used to represent the value of an integer quantity (expressed in bits)
ISO 19262:
diskreettasemete maksimaalarv kahe astmena, signaali intensiivsuse digiteeritud esituseks
= maximum number of discrete levels available for the digitized representation of the signal intensity, represented as a power of two

näiteid
https://en.wikipedia.org/wiki/Color_depth
https://en.wikipedia.org/wiki/Audio_bit_depth
https://2.bp.blogspot.com/-NQPXItfa_Og/VJ_5VBeHv3I/AAAAAAAAAgA/Ct9Ae_UW6E0/s1600/bitdepths_chart_med.jpg
https://www.projectorcentral.com/images/articles/Fig1-BitDepthValues-600.jpg
https://photography.tutsplus.com/articles/bit-depth-explained-in-depth--photo-8514