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DPChallenge Forums >> Tips, Tricks, and Q&A >> Did you know (bits of information for you to know)
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 06/17/2008 03:48:01 PM · #1
Just thought I would start another thread and post information that many already know but a lot don't.

Also helps people (and myself) learn some of the background behind photography.

06/17/2008 03:48:07 PM · #2
DID YOU KNOW:
When shooting in JPEG mode you lose seven-eights of the information the sensor sees as to RAW it captures ALL of the information.

in an 8bit image there are only 256 tones available, in a 16bit file there are 65536 tones available to you. Meaning that there is 1 white tone, 1 black tone and 65534 different shades of gray per channel.

Message edited by author 2008-06-17 15:51:03.
 06/17/2008 03:58:13 PM · #3
DID YOU KNOW:
That the larger the light source is in relation to your subject, the softer the quality of light becomes. Meaning, the closer the subject gets to the light source, the softer it becomes.
 06/17/2008 04:04:59 PM · #4
Didn't know, or not exactly. By softer light I take it you mean less contrasts? I can see this in a controlled lighting situation, but surely there are meaningful differences once you get away from direct lighting?

Wish I knew something. Edit: keep 'em coming!

Message edited by author 2008-06-17 16:05:44.
 06/17/2008 04:14:31 PM · #5
Originally posted by Dirt_Diver:
DID YOU KNOW:
When shooting in JPEG mode you lose seven-eights of the information the sensor sees as to RAW it captures ALL of the information.

in an 8bit image there are only 256 tones available, in a 16bit file there are 65536 tones available to you. Meaning that there is 1 white tone, 1 black tone and 65534 different shades of gray per channel.


DID YOU KNOW: that DSLR's don't capture 16 bit images, but 12 or 14 bits?
 06/17/2008 04:33:19 PM · #6
Originally posted by Spazmo99:


DID YOU KNOW: that DSLR's don't capture 16 bit images, but 12 or 14 bits?


You are correct, they do not capture 16 bit but when using a program like Camera Raw you can export your image as a 16bit file, this is suggested for best quality editing.

Message edited by author 2008-06-17 16:33:33.
 06/17/2008 04:35:46 PM · #7
Originally posted by Dirt_Diver:
You are correct, they do not capture 16 bit but when using a program like Camera Raw you can export your image as a 16bit file, this is suggested for best quality editing.

You can save an 8-bit JPEG as a 16-bit file, too, but doing so won't increase the number of tones you captured.
 06/17/2008 06:14:19 PM · #8
Originally posted by scalvert:
Originally posted by Dirt_Diver:
You are correct, they do not capture 16 bit but when using a program like Camera Raw you can export your image as a 16bit file, this is suggested for best quality editing.

You can save an 8-bit JPEG as a 16-bit file, too, but doing so won't increase the number of tones you captured.


This is also correct, thanks for adding...
 06/17/2008 07:18:03 PM · #9
"When shooting in JPEG mode you lose seven-eights of the information the sensor sees as to RAW it captures ALL of the information."
Hey Mr Dirt. Just wondering if this refers to JPEG fine, normal or basic? That's a lot of information.
 06/17/2008 07:27:21 PM · #10
Some people may also not realize that exposing to the right is more important when using RAW and that it's sometimes difficult to do this because most cameras "pull" the histogram from the embedded JPEG and does not reflect the RAW info.
 06/17/2008 07:53:30 PM · #11
Originally posted by walrus451:
Some people may also not realize that exposing to the right is more important when using RAW and that it's sometimes difficult to do this because most cameras "pull" the histogram from the embedded JPEG and does not reflect the RAW info.


"Exposing to the right" - you mean overexpose? That is for my benefit as well as others who might not know what you mean but are afraid to ask.

Did you know:
Better to ask the question and be a fool for a second than not ask the question and remain a fool. ;)
 06/17/2008 08:00:17 PM · #12
Originally posted by inshaala:
Originally posted by walrus451:
Some people may also not realize that exposing to the right is more important when using RAW and that it's sometimes difficult to do this because most cameras "pull" the histogram from the embedded JPEG and does not reflect the RAW info.


"Exposing to the right" - you mean overexpose? That is for my benefit as well as others who might not know what you mean but are afraid to ask.

Did you know:
Better to ask the question and be a fool for a second than not ask the question and remain a fool. ;)


; ) wise words indeed.....expose so that the histogram is snugged up to the right, but not to the point that the highlights are blown.
 06/18/2008 06:10:16 AM · #13
Originally posted by walrus451:
Originally posted by inshaala:
[quote=walrus451] Some people may also not realize that exposing to the right is more important when using RAW and that it's sometimes difficult to do this because most cameras "pull" the histogram from the embedded JPEG and does not reflect the RAW info.

.....expose so that the histogram is snugged up to the right, but not to the point that the highlights are blown.


Why??
 06/18/2008 07:11:09 AM · #14
Originally posted by ticktock01:
Originally posted by walrus451:
Originally posted by inshaala:
[quote=walrus451] Some people may also not realize that exposing to the right is more important when using RAW and that it's sometimes difficult to do this because most cameras "pull" the histogram from the embedded JPEG and does not reflect the RAW info.

.....expose so that the histogram is snugged up to the right, but not to the point that the highlights are blown.


Why??


I believe this link was referenced when this was discussed here quite a while back but since I can't find that thread, here you go. Hope it helps understand the possible benefits.
exposing to the right
 06/18/2008 02:09:59 PM · #15
Originally posted by sabphoto:
Originally posted by ticktock01:
Originally posted by walrus451:
Originally posted by inshaala:
[quote=walrus451] Some people may also not realize that exposing to the right is more important when using RAW and that it's sometimes difficult to do this because most cameras "pull" the histogram from the embedded JPEG and does not reflect the RAW info.

.....expose so that the histogram is snugged up to the right, but not to the point that the highlights are blown.


Why??


I believe this link was referenced when this was discussed here quite a while back but since I can't find that thread, here you go. Hope it helps understand the possible benefits.
exposing to the right


Very interesting read - thanks :)
 06/18/2008 02:16:36 PM · #16
Did you know you cannot lick your elbow.
Also did you know about 70% of people who read this will try it?
06/18/2008 02:41:03 PM · #17
I can lick my elbows, but that's because I can dislocate my shoulders : )
 06/18/2008 07:44:43 PM · #18
Originally posted by JaimeVinas:
Did you know you cannot lick your elbow.
Also did you know about 70% of people who read this will try it?


Yup - the other 30% know/got fooled by that the first time they were told it ;)

06/18/2008 08:01:37 PM · #19
Here is todays, useless "did you know" facts - not photography related

- Barbie's measurements if she were life size: 39-23-33.
- The dollar symbol ($) is a U combined with an S (U.S.)
- Our eyes are always the same size from birth, but our nose and ears never stop growing.
- The Statue of Liberty's tablet is two feet thick.
- There are two credit cards for every person in the United States.
- The slogan on New Hampshire license plates is 'Live Free or Die'. These license plates are manufactured by prisoners in the state prison in Concord.
- The straw was probably invented by Egyptian brewers to taste in-process beer without removing the fermenting ingredients which floated on the top of the container.
- David Prowse, was the guy in the Darth Vader suit in Star Wars. He spoke all of Vader's lines, and didn't know that he was going to be dubbed over by James Earl Jones until he saw the screening of the movie.
- The United States government keeps its supply of silver at the U.S. Military Academy at West Point, NY
- There are only thirteen blimps in the world.

Message edited by author 2008-06-18 20:04:30.
 06/19/2008 12:50:14 AM · #20
Fourteen blimps. You forgot the colonel.
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