digital photography made easy with jim battles battles photography

Digital Photography Made Easy


With Jim BattlesBattles Photography



…or so we think

Disclaimer:Disclaimer:

Although I use digital photography daily and am the

one teaching this class…

Disclaimer:Disclaimer:

…I’m still learning too.

Digital vs. filmDigital vs. film

•lower costs after startup•more efficient workflow

•no scan/sep costs•instant gratification

HardwareHardware

Camera:•professional vs. consumer

•controls•MP rating

HardwareHardware

Camera:•optical or digital zoom

•media

HardwareHardware

Computer:•Lots of RAM

•Color calibration•Data transfer interface

SoftwareSoftware

•Image capture•Image manipulation

(Photoshop, etc.)

Image controlsImage controls

•white balance•color balance

•sharpen•compression

•zoom (optical)


General rule of thumb:Don’t use most image control

functions in-camera. Apply them afterward.

Remember:Remember:

All rules of photographystill apply!

TermsTerms

Capture:The act of taking a digital

photograph

TermsTerms

CCD:Charge Couple Device, the image capture area in the

camera

TermsTerms

Removable Media:Temporary storage of data in

camera

TermsTerms

Formatting:The act of initializing or

erasing images from removable media

TermsTerms

RGB:Red, Green, Blue

The colors computers work with

TermsTerms

CMYK:Cyan, Magenta, Yellow, Black,The colors printers work with

TermsTerms

Pixel:The basic building block of

digital (bitmap) images

TermsTerms

Mega Pixel:Millions of pixels; total

number of pixels captured by a camera

TermsTerms

File format:“Container” into which digital

data is stored

TermsTerms

File formats:•TIFF•JPEG

•RAW (NEF, etc.)

TermsTerms

Resolution:Number or size of pixels in an

image

You say you want a Resolution…

Did you know….Did you know….

All digital photographs are actually black and white

images

Example:Example:

2 bit color

TermTerm

Bit:Binary digit; 0 or 1,

Black or white

Example:Example:

greyscale

TermTerm

Greyscale:An image rendered in black,

white and shades of grey

ExampleExample

full color

2 bits, 4 bits, 8 bits,A dollar?

No, a channel

ExampleExample

another full color

ResolutionResolution

Pixel depth/ bit depth:How many bits of information

per pixel is captured


2 bits x 2 bits x 2 bits= pixel depth of 8 bits

GreyscaleGreyscale

An 8-bit greyscale image can render 256 different tones

from black to white

Let’s do some mathLet’s do some math

Red chanel=256 tonesX Green chanel= 256 tonesX Blue chanel= 256 tones

=16,777,216 possible colors


Factors: pixel depth, image size and resolution (dpi)

•Affects file size


•8x10 image @ 600ppi1 bit (B&W)=3.6 MB

8 bits (greyscale)=28.8MB24 bits (RGB)=86.4 MB

32 bits (CMYK)=115.2 MB

ATTENTION!ATTENTION!

The “powers that be” request that you pay specific

attention to the following information


For commercial printing:dpi/lpi/ppi

300


@ 300dpi:1 MP = 3”x 3”2 MP= 3”x 6”

3 MP= 5.6” x 5.6”4 MP= 6” x 6”5 MP= 7” x 7”

6 MP = 6” x 20”16 MP= 13”x13”


Please note that screen resolution is 72 dpi


Many found in-camera are also found in image

manipulation software


Save images unchanged:•treat like negatives

•backup in case of error


White Balance:Camera setting to match the

lighting conditions


Color balance:Image settings between

cyan/red, magenta/green, yellow/blue


Sharpen vs USM(UnSharpMask)

TermsTerms

Artifacts:Nasty, little globs of high

contrast goo from oversharpening

TermsTerms

Noise:Specks in image due to long exposure time or high ISO

ExampleExample

noise

TermsTerms

Interpolation:Creating pixels from existing

pixels•lowers image quality


Histogram:Chart of greyscale values in

an image

OK, lets do the rest in Photoshop

OK, lets do the rest in Photoshop

Shut down this foul Microsoft application!

digital photography made easy with jim battles battles photography

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