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? Through LR 3, I think Exposure is roughly equivalent to in-camera exposure adjustments (so it affects all tonal ranges, and increases can blow out highlights). Brightness is more like a gamma adjustment, and affects primarily the midtones. This blog post has some examples: http://lightroomkillertips.com/2010/lightroom-exposure-vs-brightness/ Lightroom 4, however, will introduce a new process version, PV2012, in which the Brightness control is gone, and the Exposure control is changed substantially. The PV2012 Exposure control is more like a hybrid of the old Exposure and Brightness controls, and tries to roll off highlights to avoid clipping. Moreover, in PV2012, all of the tone controls are content-aware, so it's not a simple mapping function from input value to output value. The adjustment depends on the pixel's context in the scene, much like tone-mapping an HDR image. (My source for the content-aware claim is: http://forums.adobe.com/message/4129663#4129663 ) -- 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.
