Re: 16 bits = 15 bits in Photoshop?
Re: 16 bits = 15 bits in Photoshop?
- Subject: Re: 16 bits = 15 bits in Photoshop?
- From: Marco Ugolini <email@hidden>
- Date: Wed, 13 Apr 2005 13:37:04 -0700
In a message dated Wed, 13 Apr 2005 09:45:55, John MacDonald wrote:
> "0" is one of the values of a 16-bit file, so the brightest white would
> only go to 2 to the power of 15.
>
> In other words, the values go like this:
>
> 1. 2 to the power of 0 darkidiest dark
> 2. 2 to the power of 1
> 3. 2 to the power of 2
> 4. 2 to the power of 3
> 5. 2 to the power of 4
> 6. 2 to the power of 5
> 7. 2 to the power of 6
> 8. 2 to the power of 7
> 9. 2 to the power of 8
> 10. 2 to the power of 9
> 11. 2 to the power of 10
> 12. 2 to the power of 11
> 13. 2 to the power of 12
> 14. 2 to the power of 13
> 15. 2 to the power of 14
> 16. 2 to the power of 15 whitiest white
>
> See?
John,
If I were to apply the same structure of your explanation to the 8-bit
architecture, this would follow:
Value 1: 2 to the power of 0 (darkest dark value)
Value 2: 2 to the power of 1
Value 3: 2 to the power of 2
Value 4: 2 to the power of 3
Value 5: 2 to the power of 4
Value 6: 2 to the power of 5
Value 7: 2 to the power of 6
Value 8: 2 to the power of 7 (lightest light value)
In other words, I see a fallacy in your explanation, since, following its
logic, the highest value in 8 bits ought to be 128 (2 to the power of 7).
But we know that this is NOT true: 8 bits covers values from 0 to 255,
instead, which is something we don't need to be convinced of, having seen
evidence for it often enough in our professional work.
Am I missing something?
Best regards.
--------------
Marco Ugolini
Mill Valley, CA
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