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