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Posted

Hi to all.

why moving on the right side the White Balance cursor, in the raw file development (yellow side, for warm light) the Kelvin numbers are increased ? And symmetrically on the left side ?

Thnaks,

Paolo Epis

Posted

Hi @epispa74,

Welcome to the Affinity Forums :)

I can confirm this is the correct behaviour, as you increase the K value, the image will appear more 'warm' to counter the blue light introduced to an image.

The Kelvin scale is used to describe the conditions of the image, not the tones being added to the image - meaning the higher the kelvin value in Affinity, the warmer the image will appear.

I hope this clears things up!

Posted

Hi, thank you for the answer.

To be honest it's a strange way to work.
May be ok if you remove the "K" from the numeric slot.

In this way the number it's only the value "how much I'm moving toward the warm light".
But read 2.000K with blu light or 7.000K with yellow light it's the opposite of what happens in reality.

Thanks

Posted
20 minutes ago, epispa74 said:

But read 2.000K with blu light or 7.000K with yellow light it's the opposite of what happens in reality.

I have to agree.

https://www.westinghouselighting.com/color-temperature.aspx

Quote
 
 

Color-Temperature-Chart_revised-July-2020-1170.jpg

  • At the lower end of the scale, from 2000K to 3000K, the light produced is called “warm white” and ranges from orange to yellow-white in appearance.
  • Color temperatures between 3100K and 4500K are referred to as “cool white” or “bright white.” Light bulbs within this range will emit a more neutral white light and may even have a slightly blue tint.
  • Above 4500K brings us into the “daylight” color temperature of light. Light bulbs with color temperatures of 4500K and above will give off a blue-white light that mimics daylight.
 

 

-- Walt
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
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Posted

Apologies, this is what I'm trying to explain - the K value in Affinity needs to be set based on the conditions the image was taken under.

For example, an image with a blue cast will have been taken in ~5000K conditions, therefore you would set the Affinity slider to 5000K, which would add the warm tone to the image.

The Slider/K value in Affinity is not to indicate the colour temperature being added, you are setting the value that the image was taken under, to 'balance' out the white tones.

I hope this clears things up :)

Posted

Thanks, Dan.

-- Walt
Designer, Photo, and Publisher V1 and V2 at latest retail and beta releases
PC:
    Desktop:  Windows 11 Pro 23H2, 64GB memory, AMD Ryzen 9 5900 12-Core @ 3.00 GHz, NVIDIA GeForce RTX 3090 

    Laptop:  Windows 11 Pro 23H2, 32GB memory, Intel Core i7-10750H @ 2.60GHz, Intel UHD Graphics Comet Lake GT2 and NVIDIA GeForce RTX 3070 Laptop GPU.
    Laptop 2: Windows 11 Pro 24H2,  16GB memory, Snapdragon(R) X Elite - X1E80100 - Qualcomm(R) Oryon(TM) 12 Core CPU 4.01 GHz, Qualcomm(R) Adreno(TM) X1-85 GPU
iPad:  iPad Pro M1, 12.9": iPadOS 18.5, Apple Pencil 2, Magic Keyboard 
Mac:  2023 M2 MacBook Air 15", 16GB memory, macOS Sequoia 15.5

  • 3 years later...
Posted

This is confusing and counterintuitive.

In the photo context, lower K = warmer COLOR temp and higher K = cooler COLOR temp. Its called COLOR temperature, not energy or heat temperature, for a reason…

I took astronomy courses in college back in the day, and in fact, stars that burn (HEAT) cooler in Kelvin temp have LOWER color temperatures (warm color tones) than stars that burn HOTTER in temperature and emit cool color tones (blues).

This is backwards in Affinity. No need to reinvent the wheel….

2021 16” Macbook Pro w/ M1 Max 10c cpu /24c gpu, 32 GB RAM, 1TB SSD, macOS Sequoia 15.1

2018 11" iPad Pro w/ A12X cpu/gpu, 256 GB, iPadOS 18.1

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