Color Temperature & White Balance vs. ISO Speed Standards
Comparing 2 standards across 12 specifications. 12 key differences identified.
Color Temperature (measured in Kelvin / K, standardized under CIE illuminant standards) defines the spectral chromaticity of light emitted by an idealized black-body radiator. Governing camera white balance, it ranges from warm Candlelight (1800K) and Tungsten Studio (3200K) through Photographic Daylight (5600K / CIE D55) to Overcast Sky (6500K / CIE D65) and Deep Blue Shade (8000K–10000K).
ISO Speed (standardized under ISO 12232 for digital sensors and ISO 6 / ISO 2240 for film, combining historical American ASA arithmetic and German DIN logarithmic scales) defines the sensitivity of an imaging medium to light. Operating on an arithmetic doubling progression (ISO 100 -> 200 -> 400 -> 800 -> 1600 -> 3200 -> 6400), each step doubles sensitivity, requiring half the exposure time (+1 EV).
Specification Comparison Table
12 Parameters| Parameter / Spec | ||
|---|---|---|
|
Tungsten / Halogen Standard
|
3200 K (Standard interior film incandescent / studio tungsten quartz lighting) | — |
|
Commercial Warm White Home Lighting
|
2700 K to 3000 K (Warm ambient household LEDs and Edison bulbs) | — |
|
Direct Sunlight / Flash Standard
|
5500 K to 5600 K (Standard photographic electronic flash and noon direct sunlight) | — |
|
CIE Standard Illuminant D65
|
6504 K (Standard average daylight definition, sRGB / Rec.709 / Display P3 monitor white point) | — |
|
Overcast Sky & Open Shade
|
6500 K to 8000 K (Cool blue-tinted indirect atmospheric skylight) | — |
|
Mired Shift Calculation
|
Mired = 1,000,000 / Kelvin (Used for precise optical color temperature warming/cooling filters) | — |
|
Tint Tint Scale (Green / Magenta)
|
Orthogonal CC tint axis (corrects for fluorescent mercury gas spikes and green LED CRI spikes) | — |
|
Standard Arithmetic Progression
|
— | ISO 50 -> 100 -> 200 -> 400 -> 800 -> 1600 -> 3200 -> 6400 -> 12800 -> 25600 -> 51200 -> 102400 |
|
1/3-Stop Increments
|
— | ISO 100, 125, 160, 200, 250, 320, 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, 3200 |
|
Dual Native ISO Architecture
|
— | Two distinct analog gain circuits, switched rather than blended (e.g. Sony A7S III/FX3 in S-Log3: Low Base ISO 640 / High Base ISO 12,800 -- exact pair varies by camera and picture profile) |
|
Base ISO Signal-to-Noise
|
— | Maximum dynamic range and 14+ stops of tonal latitude typically occurs at the camera's lowest native hardware ISO (e.g. ISO 100 or ISO 64 on Nikon D850/Z8) -- dual native ISO sensors are the exception, with a second local peak at their high base ISO |
|
Historical Standard Fusion
|
— | ISO 400/27° fused American ASA 400 (arithmetic) with German DIN 27° (logarithmic) |