Download - 459-chapter 3-2015
from film to signals
a gelatin emulsion spread on a paper or plastic basecannot be seen or touched without physical interface
a mathematically coded series of electrical or magnetic potentials
brain & network of neurons - no brain, no thoughts
=digital images & network of electronic switches
-no hardware, no image
How an image is digitized.
digital capture , a solid-state transducer or pixels: converting light to electrical energy
pixels: picture elements-assigned a value : bit (1 & 0)8 bits=a bytecolor = 24 bit
stored as a data block (file) : color = 3 x black & white
Sensor Types
1. Scanning backs72 by 96mm
2. CCDS or CMOSS
Sensor Size
35mm film = full frame = 24x36
focal factor 1.3 to 2 = crop factor
a sensor with a focal factor 1.5 = 20mm x 1.5 = 35mm
full frame sensors = focal factor 1
architectural photography Camera _wide angle lenses
_perspective control_sensor size
Chapter 4. the Digital workflow
“development”
memory cards or micro drives
1. “pro-“ type cards2. 8GB or 5 x 2GB
3. reformat4. the fastest card : 32 bit
RAW files = digital negatives
1. JPEG2. TIFF3. GIF4. PSD5. PDF
6. DNG (the latest TIFF)
Color Management
RGB color mode = red + green + blueCMYK color mode = cyan + magenta + yellow + black
Image editing
dynamic range
the digital workflow for architectural photography
1. image capture, backup of raw file2. raw file conversion3. preliminary sharpening : tonal gradient, edge
sharpening4. establishing manageable dynamic range : highlights
& shadows5. brightness, contrast, color correction6. image clean up7. geometric control8. creative sharpening9. cropping10. noise reduction11. output sharpening12. back-up of final files