Outline ! Conclude basic photography, general workflow. ! • Take the Shot ! The Art, Science and Algorithms • Post processing, rule of thumb (white balance) ! • Print, post your shots on the web (general, of Photography ! guidelines) ! • More about the zone system ! Finish Basic Photography • Odds & Ends ! General Workflow ! Next week: ! CSCI 4900/6900 ! ! Start with : Camera hacking begin ! Maria Hybinette ! ! More advanced topics (sensor limitations, color theory, lens choice). ! 1 ! 2 ! 1. Basic Workflow (Natural light) ! 2. Basic Workflow: Raw Editing ! • Visualize your shot (portraits), planning ! • Shoot in RAW (we will talk about JPG vs RAW shortly) ! • Context, background, clothing. ! – Easier, improves dynamic range ! • Best light: Golden hour, 1 hour: after/before sun ! – Easier to post process, less artifacts, higher qualiy ! – Later: sensors are linear devices, vision isn’t we will talked • Exposure, rule of thumb: ! about and visualize: ! • Photons: Twice the light – twice the voltage linear ! – ISO: Low ISO (less noise, higher dynamic range). ! • Vision: How exposure works and vision logarithmic ! • Do RAW adjustments (lower contrast, correct white – Depth of field (isolate your subject? or story telling? ! balance, exposure compensation (clippings), make sure – Shutter for correct exposure. ! you retain details – shadow, highlight recovery, careful – Zone system (more shortly) maximize dynamic range ! with brightness / black point / contrast sliders). ! • White Balance (in camera, reduces post processing, – Goal: maximize dynamic range & retain the details. ! – Works on linear data (discuss this more later) ! but in general can be fixed later). !! • Go into photoshop (applies a gamma curve, locks RGB • Take the shot, evaluate, re-take the shot ! values). ! 3 ! 4 ! 3. Basic Workflow: Photoshop Edit ! White Balance (Global) ! • Correct in ACR/Lightroom ! • Remove noise (plug-ins?) – (talk about this later) ! – Easy ! – Some people do this later ! • Photoshop ! – Noise removal in LAB space ! • Remove Color casts (today) ! – Color info / Color ! – LAB (easy to monitor neutrals) ! • Add contrast, color enhancement ! – Levels (yellow family) ! • Save ! – Color balance (yellow family) ! • Sharpen ! – Curves (black point, medium grey, white point) ! – Grey fill layers to find medium grey ! • Crop ! • Difference blending mode ! • Publish ! – Darkest areas are the most similar !! » Eye, Treshold ! 5 ! 6 !
Neutrals ! Color Balance Levels ! • What is neutral? ! • Tutorial using RGB Channels ! – Should be 0A, 0B (or close to) LAB ! – Black, white and grey are all 0A, 0B ! – Cats have white fur (cat’s greys are harder, could be brown). ! – Concrete, tires, clouds, gray hair, rocks, stones, asphalt, cement, snow ! – Brushed aluminum, iron, steel, ivory soap, sidewalks ! • What is not neutral? (Chromatic adaption) ! – Eye ‘whites’ are pink (red) ! – Undyed hair range from yellow to black (grey) ! • Never green or blue ! • What to do if there is no grays? ! !"#$%%&'()*+*#&,*-(./0%)*+*%1.2./34-2-'5&6 7 ! 8 ! Color Balance ACR ! Color Balance CS5 ! • Tutorial using ACR and batching ! • Color Balance using LAB and Curves ! 9 ! 10 ! Simple Color Pop in LAB ! Simple HDR Tutorials ! • Tutorial ! • Tutorial:: using CS5 ! • Tutorial: using PhotoMatix ! 11 ! 12 !
Slide Credits/Resources ! Basic Photography: Left to talk about ! • Digital Capture: ! • Prof. Fredo Durand ! • Prof. Marc Levoy ! – Bits / RAW and dynamic range (today if time) ! • HDR (beginning, Photoshop) ! • Bruce Fraser ! • White balance ! – Raw Capture (read) ! • London, Stone, Upton Textbook ! Coming Soon: ! • Wikipedia ! • Camera hacking (next week) ! • http://www.normankoren.com/makingfineprints1A.html ! • Noise and dynamic range ! • http://www.normankoren.com/digital_tonality.html ! • http://www.luminous-landscape.com/tutorials/expose-right.shtml ! • Advanced HDR ! • http://www.cambridgeincolour.com/tutorials (Dr. Sean McHugh) ! • • RAW vs JPG ! http://www.bythom.com/graycards.htm ! – ANSI standard is 12% gray (1/2 stop less than 18% gray on Kodak Gray • Lenses, focal lengths, distortion and DOF ! Cards). ! – http://david.spielman.com/Gray_Card/ANSI_PH3_49_1971.PDF ! 13 ! 14 !
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