just by name alone I would think exposure is the entire image level and brightness would be midpoint gamma levels only.
----------------- J.C.O'Connell [email protected] ----------------- -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Parsons Sent: Sunday, February 26, 2012 10:46 AM To: Pentax-Discuss Mail List Subject: Re: LR Question: exposure vs. brightness If you are familiar with PS, Exposure sets your White Point, Brightness sets your gamma/midpoint, and Blacks sets your Black point. They correspond to the three controls in the Levels tool. If you hold the Alt key while adjusting the Exposure or Blacks sliders, you'll see that you are trying to adjust your levels to get the most detail without clipping (or setting them to control clipping however you like). On Sun, Feb 26, 2012 at 10:33 AM, Sam L <[email protected]> wrote: > On Sun, Feb 19, 2012 at 7:56 PM, Larry Colen <[email protected]> wrote: >> In lightroom (and I imagine PS camera raw), what is the difference between the exposure slider and the brightness slider? >> >> I expect that exposure is just a linear multiplier on the raw value, the slope of the line as it were, and the blacks slider is the "b" of the y=mx+b of a linear conversion from raw to final. >> >> I can't figure out what the brightness slider does. It's odd that in library mode, if you click on brightness twice, it seems to go to a default of 0, while in develop mode, clicking on it twice seems to set it to 50. >> >> I'd actually be interested in seeing a simple description of the mathematical transforms of each of the lightroom exposure sliders, so I could better understand what I'm actually doing when I twiddle and frob them. > > > I think its interesting/odd that when I click the "auto" develop > button in LR on my jpegs it always adjusts the Brightness slider but > not the Exposure slider. > > This may be simplistic, but that seems to tell me that I should be > using Brightness instead of Exposure most of the time. > > --------------------------- > Sam > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- David Parsons Photography http://www.davidparsonsphoto.com Aloha Photographer Photoblog http://alohaphotog.blogspot.com/ -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
