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Digital Photography Made Easy With Jim Battles Battles Photography
Digital Photography Made Easy …or so we think
Disclaimer: Although I use digital photography daily and am the one teaching this class…
Disclaimer: …I’m still learning too.
Digital vs. film lower costs after startup more efficient workflow no scan/sep costs instant gratification
Hardware Camera: professional vs. consumer controls MP rating
Hardware Camera: optical or digital zoom media
Hardware Computer: Lots of RAM Color calibration Data transfer interface
Software Image capture Image manipulation (Photoshop, etc.)
Image controls white balance color balance sharpen compression zoom (optical)
Image controls General rule of thumb: Don’t use most image control functions in-camera. Apply them afterward.
Remember: All rules of photography still apply!
Terms Capture: The act of taking a digital photograph
Terms CCD: Charge Couple Device, the image capture area in the camera
Terms Removable Media: Temporary storage of data in camera
Terms Formatting: The act of initializing or erasing images from removable media
Terms RGB: Red, Green, Blue The colors computers work with
Terms CMYK: Cyan, Magenta, Yellow, Black, The colors printers work with
Terms Pixel: The basic building block of digital (bitmap) images
Terms Mega Pixel: Millions of pixels; total number of pixels captured by a camera
Terms File format: “Container” into which digital data is stored
Terms File formats: TIFF JPEG RAW (NEF, etc.)
Terms Resolution: Number or size of pixels in an image
You say you want a Resolution…
Did you know…. All digital photographs are actually black and white images
Example: 2 bit color
Term Bit: Binary digit; 0 or 1, Black or white
Term Greyscale: An image rendered in black, white and shades of grey
Example full color
2 bits, 4 bits, 8 bits, A dollar? No, a channel
Example another full color
Resolution Pixel depth/ bit depth: How many bits of information per pixel is captured
Resolution 2 bits x 2 bits x 2 bits = pixel depth of 8 bits
Greyscale An 8-bit greyscale image can render 256 different tones from black to white
Let’s do some math Red chanel=256 tones X Green chanel= 256 tones X Blue chanel= 256 tones =16,777,216 possible colors
Resolution Factors: pixel depth, image size and resolution (dpi) Affects file size
Resolution 8x ppi 1 bit (B&W)=3.6 MB 8 bits (greyscale)=28.8MB 24 bits (RGB)=86.4 MB 32 bits (CMYK)=115.2 MB
ATTENTION! The “powers that be” request that you pay specific attention to the following information
Resolution 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”
Resolution Please note that screen resolution is 72 dpi
Image controls Many found in-camera are also found in image manipulation software
Image controls Save images unchanged: treat like negatives backup in case of error
Image controls White Balance: Camera setting to match the lighting conditions
Image controls Color balance: Image settings between cyan/red, magenta/green, yellow/blue
Image controls Sharpen vs USM (UnSharpMask)
Terms Artifacts: Nasty, little globs of high contrast goo from oversharpening
Terms Noise: Specks in image due to long exposure time or high ISO
Terms Interpolation: Creating pixels from existing pixels lowers image quality
Image controls Histogram: Chart of greyscale values in an image
OK, lets do the rest in Photoshop Shut down this foul Microsoft application!
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