Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Learning
Photography Q&A
Dana : A Fine Line Between Beauty & Glamour. Blamour?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Robert Mitchell" data-source="post: 112095" data-attributes="member: 11282"><p>I'd love to see the source for this principle of less light. That's not correct at all. If all other things are equal, including exposure, then contrast won't change.</p><p></p><p>If I have a light on my subject that produces f/16 and then reduce the quantity of light by 2 stops so that it produces f/8, contrast does not change at all. If it's changing then the light source has moved.</p><p></p><p>If you have a white cube on black velvet and want to render the cube as white then the velvet can't be black. If you want to render the velvet as pure black then the cube will be gray, not white. In this example, the perception of change in contrast occurs because you're sliding the exposure window around depending on where you want your mid tone. If it's a properly placed mid tone then neither the white cube or black velvet will render correctly but since contrast is really the difference between highlight and shadow, that range remains the same regardless of the quantity of light.</p><p></p><p>With digital, the key is to expose for highlights and to retain detail. All other values fall where they may. This is because in the digital world it's just like recording digital sound. When the level clips, you get distortion. With digital imaging, when highlights clip they are lost and can't be recovered.</p><p></p><p>If you expose for lower values then highlights and something like a white wedding gown will never be white and the chances of introducing noise are much greater if you underexpose and then have to raise exposure in post. You can further adjust black point to create the illusion of a wider dynamic range.</p><p></p><p>Digital sensors get better and better every day and the D800 or a medium format camera are examples of incredible dynamic range, but with most digital cameras the dynamic range is so limited that you can't have white and black at the same time and in terms of 'picking your poison', I'd rather push my highlights and have to adjust my black point rather than underexpose my highlights and raising overall exposure. Typically, DSLR's have more latitude above the midtone than below. Below the mid tone, black and shadows get crushed together and become a black mush.</p></blockquote><p></p>
[QUOTE="Robert Mitchell, post: 112095, member: 11282"] I'd love to see the source for this principle of less light. That's not correct at all. If all other things are equal, including exposure, then contrast won't change. If I have a light on my subject that produces f/16 and then reduce the quantity of light by 2 stops so that it produces f/8, contrast does not change at all. If it's changing then the light source has moved. If you have a white cube on black velvet and want to render the cube as white then the velvet can't be black. If you want to render the velvet as pure black then the cube will be gray, not white. In this example, the perception of change in contrast occurs because you're sliding the exposure window around depending on where you want your mid tone. If it's a properly placed mid tone then neither the white cube or black velvet will render correctly but since contrast is really the difference between highlight and shadow, that range remains the same regardless of the quantity of light. With digital, the key is to expose for highlights and to retain detail. All other values fall where they may. This is because in the digital world it's just like recording digital sound. When the level clips, you get distortion. With digital imaging, when highlights clip they are lost and can't be recovered. If you expose for lower values then highlights and something like a white wedding gown will never be white and the chances of introducing noise are much greater if you underexpose and then have to raise exposure in post. You can further adjust black point to create the illusion of a wider dynamic range. Digital sensors get better and better every day and the D800 or a medium format camera are examples of incredible dynamic range, but with most digital cameras the dynamic range is so limited that you can't have white and black at the same time and in terms of 'picking your poison', I'd rather push my highlights and have to adjust my black point rather than underexpose my highlights and raising overall exposure. Typically, DSLR's have more latitude above the midtone than below. Below the mid tone, black and shadows get crushed together and become a black mush. [/QUOTE]
Verification
Post reply
Forums
Learning
Photography Q&A
Dana : A Fine Line Between Beauty & Glamour. Blamour?
Top
