LoL..kinda wish I could let go. Actually, I knew better and have no excuses. I was honestly curious..yes, I know about the stiff cat.
Jack --- On Mon, 4/5/10, P. J. Alling <webstertwenty...@gmail.com> wrote: > From: P. J. Alling <webstertwenty...@gmail.com> > Subject: Re: Define "blown out" :-) > To: "Pentax-Discuss Mail List" <pdml@pdml.net> > Date: Monday, April 5, 2010, 2:15 PM > Well, I for one am staying the hell > out of this. > > On 4/5/2010 4:07 PM, David Parsons wrote: > > I didn't see a question in your first post. > > > > On Mon, Apr 5, 2010 at 3:44 PM, Jack Davis<jdavi...@yahoo.com> > wrote: > > > >> I only read as far as about half of your first > sentence. I didn't need to read further as it was obvious > you had missed the point of the question. > >> > >> Jack > >> > >> --- On Mon, 4/5/10, Godfrey DiGiorgi<gdigio...@gmail.com> > wrote: > >> > >> > >>> From: Godfrey DiGiorgi<gdigio...@gmail.com> > >>> Subject: Re: Define "blown out" :-) > >>> To: "Pentax-Discuss Mail List"<pdml@pdml.net> > >>> Date: Monday, April 5, 2010, 12:05 PM > >>> On Mon, Apr 5, 2010 at 10:27 AM, Jack > >>> Davis<jdavi...@yahoo.com> > >>> wrote: > >>> > >>>> I'll offer mine the nebulous term by > saying that if at > >>>> > >>> least some surface areas are rendered > featureless by virtue > >>> of being too bright, I'd consider those areas > "blown out." > >>> Many images can tolerate a certain amount of > this condition, > >>> but it's amount is the criteria and varies > with each viewer. > >>> Said areas must, of course, contain some > available mask > >>> detail which defines the surface. > >>> > >>>> IOW, I'm not talking about an absolute > ball of glare > >>>> > >>> wherein no detail is discernible. > >>> > >>> There's nothing nebulous about "blown out". > Consider areas > >>> of pure > >>> white with no detail as Zone 9 on the Zone > System > >>> scale defined as > >>> follows: > >>> > >>> Zone 0 – key black or pure black – carbon > or photo > >>> paper black. > >>> Zone 1 – near black – shadows in faint > light or rooms > >>> without light. > >>> Zone 2 – dark gray/black – only subtle > textures are > >>> visible. > >>> Zone 3 – very dark gray – distinct shadow > texture is > >>> visible. > >>> Zone 4 – medium dark gray – slightly > darker “black” > >>> skin, dark foliage > >>> or shadows in landscapes. > >>> Zone 5 – medium gray or 18% gray – darker > “white” > >>> skin or lighter > >>> “black skin,” light foliage or the dark > blue of a clear > >>> blue sky. > >>> Zone 6 – mid-tone gray – average > “white” skin or > >>> shaded areas in snow > >>> on a bright, sunlit day. > >>> Zone 7 – light gray – pale “white” > skin, a concrete > >>> walkway in sunlight. > >>> Zone 8 – gray/white, near white – distinct > highlight > >>> detail, like a > >>> white wall in sunlight or brilliant surfaces > in flat > >>> light. > >>> Zone 9 – known as key white or pure white > – pure white > >>> paper or snow > >>> in bright sunlight. > >>> > >>> (Normally I think of the Zones as being from > 1-10, but > >>> Ansel was a C > >>> programmer and did a 0-based count ... ;-) > >>> > >>> So, by definition, anything you want detail in > is "blown > >>> out" if your > >>> exposure has placed it above Zone 8 on the > above scale. > >>> > >>> Since I've never seen any application use > 16-bit number > >>> scales to > >>> describe pixel values, you can determine what > areas of your > >>> image are > >>> "blown out" in Photoshop or Lightroom using > either a > >>> percentage scale > >>> or an 8-bit pixel value scale and floating the > cursor over > >>> white-looking areas while looking at the > information > >>> display panel. > >>> Presuming that the exposure did not go to > saturation and > >>> there is data > >>> in those bright areas, you can place them in > adjustment > >>> using the > >>> Exposure (aka white point) sliders. This table > makes it > >>> easy ... > >>> > >>> http://homepage.mac.com/godders/zone-system-numbers.jpg > >>> > >>> EG: you have a near blown out area in a photo > that you want > >>> to ensure > >>> images with detail on screen and in your > prints. Float the > >>> cursor over > >>> it in Lightroom and see that it is currently > at about 94% > >>> in all > >>> channels (or in one of them if that is the > significant > >>> color of the > >>> area). Nudge the Exposure slider in the > negative direction > >>> until it is > >>> in the range of about 85-88% to set that as > the brightest > >>> point. Now > >>> make adjustments with the mid-tone, black > point and Tone > >>> Panel to > >>> bring the rest of the photo into line with a > satisfactory > >>> display. > >>> > >>> A certain amount of area at Zone 9 is fine, as > long as it's > >>> not where > >>> you wanted to convey detail. Too much Zone 9 > in an image > >>> generally > >>> looks bad. Another thing to be aware of is > that many papers > >>> and > >>> monitor screens cannot display the full 10 > zone scale very > >>> well, or > >>> have non-linear characteristics ... That's why > calibration, > >>> profiling > >>> and testing for DR are essential to good > quality image > >>> display, > >>> whether on screen or on paper. > >>> -- > >>> Godfrey > >>> godfreydigiorgi.posterous.com > >>> > >>> -- > >>> PDML Pentax-Discuss Mail List > >>> PDML@pdml.net > >>> 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 > >> PDML@pdml.net > >> http://pdml.net/mailman/listinfo/pdml_pdml.net > >> to UNSUBSCRIBE from the PDML, please visit the > link directly above and follow the directions. > >> > > > > > > > > > -- > {\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fcharset0 > Courier New;}} > \viewkind4\uc1\pard\f0\fs20 I've just upgraded to > Thunderbird 3.0 and the interface subtly weird.\par > } > > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > 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 PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
