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05/31/2005 09:11:54 AM · #1 |
Hi,
I shoot everything in RAW mode... recently I did a shoot and made a composit shot of a little girl doing dance in her dance costume. I inadvertantly opened up all her pics in 16 bit, and spent 5 hours making the composit shot, all of which was done in 16 bit. The web sight I use to show my pics only accepts 8 bit. Is there a way to change a picture once it is out of the RAW converter back to 8 bit? I hope so!
Jen |
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05/31/2005 09:15:47 AM · #2 |
if you are in photoshop, do this
Image->Mode-> 8 bits/Channel
that should do it |
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05/31/2005 09:16:15 AM · #3 |
Image>Mode>8 bits/channel
Too slow!
Message edited by author 2005-05-31 09:16:29.
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05/31/2005 09:17:19 AM · #4 |
Well, if you are using ps;
Image-Mode-8 bits
Keep in mind that once you save the image going back to 16 is
pretty much pointless. So you may want to do a save as if you think
that you may have more editing to do later.
edit - even slower
Message edited by author 2005-05-31 09:17:40. |
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05/31/2005 09:17:32 AM · #5 |
| when i open a raw ile i can choose 16bit or 8 bit. whats the difference? and why does it matter? |
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05/31/2005 09:28:17 AM · #6 |
16 bit is better quality (allowing for more colors, etc. or audio depth for audio files)
Essentially think of of it this way. You have 8 points of measuring a curve or you have 16 points? Which will portray that curve better? Sure, from a meter away they both may look like a curve but from close up the 16 points will show a better curve.
Now that's a laymen's description done to allow you to conceptualize. Often what's really being done is decimal math. How many places after the zero are you recording? If you can only use whole digits 1,2,3,4... you can't get as precise a shade of color as if you were using decimals... 2.5, 4.5, etc |
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05/31/2005 09:28:59 AM · #7 |
Originally posted by kirbic:
Image>Mode>8 bits/channel
Too slow! |
lol |
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05/31/2005 09:30:18 AM · #8 |
Originally posted by reemas:
when i open a raw ile i can choose 16bit or 8 bit. whats the difference? and why does it matter? |
With 8 bit color, there is a total of 256 colors available. With 16 bit color, a total of 65536 |
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05/31/2005 09:33:23 AM · #9 |
You're on the right lines, only the munbers are a lot higher than that.
e |
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05/31/2005 09:36:25 AM · #10 |
Thanks so much!! Easy and effective... that's what I like :o)
Jen |
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05/31/2005 09:49:25 AM · #11 |
Originally posted by superdave_909:
With 8 bit color, there is a total of 256 colors available. With 16 bit color, a total of 65536 |
I'm sure you know, Dave, but for clarification of others:
"8 bit vs. 16 bit" actually refers to the number of bits PER CHANNEL.
In the case of an 8 bit/channel image, it has a total of 24 bits per pixel.
In the case of a 16 bit/channel image, it has a total of 48 bits per pixel
Each of these channels holds the amount of red, green and blue present, per pixel. An 8 bit red channel can represent 256 different shades of red. A 16 bit red channel can represent 65535 different shades of red.
Message edited by author 2005-05-31 09:50:08.
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05/31/2005 09:52:15 AM · #12 |
Originally posted by PaulMdx:
Originally posted by superdave_909:
With 8 bit color, there is a total of 256 colors available. With 16 bit color, a total of 65536 |
I'm sure you know, Dave, but for clarification of others:
"8 bit vs. 16 bit" actually refers to the number of bits PER CHANNEL.
In the case of an 8 bit/channel image, it has a total of 24 bits per pixel.
In the case of a 16 bit/channel image, it has a total of 48 bits per pixel
Each of these channels holds the amount of red, green and blue present, per pixel. An 8 bit red channel can represent 256 different shades of red. A 16 bit red channel can represent 65535 different shades of red. |
Yeah, I didn't want to try to explain it, my wife says when I talk about
this stuff I make it more complicated than it needs to be. So I went and found this link.
//www.luminous-landscape.com/tutorials/bit-depth.shtml
but you did a fine job of explaining it! |
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05/31/2005 10:59:31 AM · #13 |
| great replies. thanks for all the explanations!! |
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