Re: 16 bits = 15 bits in Photoshop?
Re: 16 bits = 15 bits in Photoshop?
- Subject: Re: 16 bits = 15 bits in Photoshop?
- From: John MacDonald <email@hidden>
- Date: Wed, 13 Apr 2005 17:42:41 -0400
- Organization: Dodge Color, Inc.
Oops! Sorry, Marco! I misread your question!
Now I see what you're talking about.
John
Marco Ugolini wrote:
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
--
John MacDonald
Dodge Color, Inc.
4827 Rugby Ave.
Bethesda, MD 20814
(301)656-0025 ext. 223
www.dodgecolor.com
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