Twelve significant photographs in any one year is a good crop. - Ansel Adams. Color. Introduc)on to Digital Photography

Transcription

1 Twelve significant photographs in any one year is a good crop. - Ansel Adams Color Introduc)on to Digital Photography

2 Lecture outline How we see color Addi)ve (RGB) / Subtrac)ve (CMYK) HSB Hue Satura)on Brightness (Luminosity) Color Space ProPhoto Adobe RGB srgb Which one to use? Color temperature

3 How We See Color Re)na Cones Short wavelength (blue) Middle wavelength (green) Long wavelength (red) Human eye: 10 Million color range Digital camera: Color space we select hqp://upload.wikimedia.org/wikipedia/commons/thumb/0/04/cone-fundamentals-withsrgb-spectrum.svg/540px-cone-fundamentals-with-srgb-spectrum.svg.png

4 How We See Color Color = reflected light that is not absorbed by the object hqp://appleadayproject.files.wordpress.com/2011/03/apple-full2.jpg

5 How We See Color 1 Million colors (actual size: 1000 x 1000 px) hqp://en.wikipedia.org/wiki/file:1mcolors.png

6 Addi)ve (rgb) / Subtrac)ve (cmyk) Addi)ve color light in a vacuum red + green + blue = white subtrac)ve colors hqp://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/ Addi)veColor.svg/500px-Addi)veColor.svg.png

7 Addi)ve (rgb) / Subtrac)ve (cmyk) Subtrac)ve color ink on paper yellow + cyan + magenta = purple-gray addi)ve colors hqp://upload.wikimedia.org/wikipedia/commons/thumb/1/19/ Subtrac)veColor.svg/500px-Subtrac)veColor.svg.png

8 Addi)ve (rgb) / Subtrac)ve (cmyk) RGB / CMYK color space RGB brighter than CMYK RGB = transmiqed light CMYK = reflected light hqp://en.wikipedia.org/wiki/file:rgb_and_cmyk_comparison.png

9 Hue / Satura3on / Brightness Hue color value between Satura)on amount of color less satura)on = lighter color Brightness luminosity or value less brightness = darker color

10 Munsell Color Space

11 Color Space Mathema)cally defined color space (Interna)onal Commission on Illumina)on, 1931) Based on visual percep)on of color by the human eye Basis of color space used in digital photography, Photoshop & Lightroom hqp://upload.wikimedia.org/wikipedia/commons/5/52/ Chroma)city_diagram_full.pdf

12 Prophoto Color Space Developed by Kodak largest color space has imaginary colors that exist outside visible color range able to more faithfully reproduce saturated reds, yellows, and oranges on high-end color printers na)ve color space for Adobe Lightroom and Photoshop hqp://en.wikipedia.org/wiki/file:colorspace.png

13 Adobe RGB Color Space Developed by Adobe aka AdobeRGB (1998) designed to encompass most of colors available to CMYK printers one of two color spaces available in most commercial digital cameras na)ve color space for older versions of Photoshop hqp://en.wikipedia.org/wiki/file:colorspace.png

14 Standard RGB (srgb IEC ) aka small RGB (or $h!qy RGB) small = 16.7 million colors smallest of non-indexed (GIF) color spaces color inkjet friendly color space na)ve color space for JPEG images srgb Color Space hqp://en.wikipedia.org/wiki/file:colorspace.png

15 Which Color Space to Use? Size maqers: bigger is beqer some)mes Digital cameras should be set to largest possible color space available srgb is used for computer displays, web, visual media, and low-end (four color) inkjet printers hqp://en.wikipedia.org/wiki/file:colorspace.png

16 Color Temperature Color also has a temperature value based on degrees K (Kelvin) Blue colors have a higher K temperature but are seen as cooler Red colors have a lower K temperature but are seen as warmer hqp:// colortempchart.jpg

17 Some common color temperatures Color Temperature Calibrated monitors & LCD screens have a white point of around 6500 K hqp://photographysquad.com/images/light.gif

18 Color Temperature Color temperature can also be equated to white balance Adobe Camera Raw allows you to adjust white balance in post processing so long as you shoot RAW files JPEGs have white balance encoded into file, can t easily change it hqp://livedocs.adobe.com/en_us/photoshop/10.0/images/ sca_white_balance.png