Digital Image Prep for Displays

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Digital Image Prep for Displays Jim Roselli ISF-C, ISF-R, HAA Tonight's Agenda • A Few Basics • Aspect Ratios • LCD Display Technologies • Image Reviews Light Basics We view the world in 3 colors Red, Green and Blue We are Trichromatic beings We are more sensitive to Luminance than to Color Our eyes contain: • Light 4.5 million cones (color receptors) 90 million rods (lumen receptors) Analog vs. Digital Light Sample • Digitize the Photon Light Sample Light Sample DSLR’s Canon 5D mkII and Nikon D3x 14 bits per color channel (16,384) Color channels (R,G & B) • Digital Capture Digital Backs Phase One 16 bits per channel (65,536) Color channels (R,G & B) Square Pixels Big pixels have less noise … Spatial Resolution Round spot vs. Square pixel • Size Matters Square Pixels • What is this a picture of ? Aspect Ratio Using Excel’s “Greatest Common Divisor” function • The ratio of the width to =GCD(x,y) xRatio = (x/GCD) the height of the image yRatio = (y/GCD) on a display screen Early Television • How do I calculate this ? Aspect Ratio 4 x 3 Aspect Ratio • SAR - Storage Aspect Ratio • DAR – Display Aspect Ratio • PAR – Pixel Aspect Ratio Aspect Ratio Device Width(x) Heigth(y) GCD xRa5o yRa5o Display 4096 2160 16 256 135 Display 1920 1080 120 16 9 • Examples Display 1280 720 80 16 9 Display 1024 768 256 4 3 Display 640 480 160 4 3 Aspect Ratio Device Width(x) Heigth(y) GCD xRa5o yRa5o Nikon D3x 6048 4032 2016 3 2 • Examples Canon 5d mkII 4368 2912 1456 3 2 Aspect Ratio Device Width(x) Heigth(y) GCD xRa5o yRa5o iPhone 1 480 320 160 3 2 HTC Inspire 800 480 160 5 3 • Examples Samsung InFuse 800 480 160 5 3 iPhone 4 960 640 320 3 2 iPad III 2048 1536 512 4 3 Motorola Xoom Tablet 1280 800 160 8 5 Future Aspect Ratio Device Width(x) Heigth(y) GCD xRa5o yRa5o Display 2048 1536 512 4 3 Display 3840 2160 240 16 9 Display 7680 4320 480 16 9 Aspect Ratio 4K Format Aspect Ratio • Don’t be scared … Pan D3x Frame .

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