Basic photography Art, composition, and computer principles AEE 211 February 24, 2003.
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Transcript of Basic photography Art, composition, and computer principles AEE 211 February 24, 2003.
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Basic photography—Art, composition, and computer principles
AEE 211
February 24, 2003
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What makes these images effective?
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Overview
• Basic composition– Mood and atmosphere– Qualities of a good photo– Basic composition– Improving composition
• Working with the computer– Files– Scanning– Printing
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Creating mood
• Overall feel of a picture
• Created by– Perspective– Color– Focus (isolation and distance)– Weather and light
• Sunrise/sunset
• Misty, rainy days
• Sun vs. overcast
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Characteristics of a good photo
• Shape
• Line
• Pattern
• Texture
• Size and space
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Shape
• Tends to be noticed first, before texture and pattern
• Easiest and most recognizable composition tool– Shape helps create a mood/character for the
picture– Search for the unconventional or surprise shape
in objects
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Creating shape
• Common—– use backlighting to create a silhouette
• Uncommon—– side lighting with simple background– underexpose to focus on shape vs. color or
texture
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Line
• Lines create – Shape– Pattern– Depth– Perspective
• Line leads the eye– Focal point/subject– Diagonals– S-curves
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Line creates perspective
• Lines into the horizon show depth and perspective for the viewer
• Vanishing point– Point at which lines converge and vanish in to
the horizon– Place off-center
• Close-ups decrease perspective while wide-angles can exaggerate it
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Pattern
• Orderly combination of shape, line, or color
• Pattern can help echo the character of a photo
• Catching attention– Random patterns– Slight variation in a pattern– Pattern in common places
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Texture
• Adds realism (sense of touch) to a photo
• Sharp (hard) light highlights texture
• Especially important for close-up and b/w shots
• Side lighting highlights texture
• Most portraits use front lighting to decrease texture on skin
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Using light for depth
• Sometimes hard light is inappropriate for illustrating shape and depth
• Soft side lighting can give a sense of shape and depth without high contrast– Portraits– Still life– When shape/depth is more important that
texture
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Size and space
• 2D pictures distort depth, relative size, and distances– Include reference item– Include parts of the fore- or background– Use a frame– Be creative—maybe you want to distort
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Giving perspective
• Linear—Lines which converge into the distance
• Diminishing size—objects further away are smaller
• Aerial perspective—atmosphere creates haze, which lightens objects farther away
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Depth and perspective
• Overlapping forms—overlapping objects in a picture create depth and distance
• Selective focusing—focusing on the foreground and blurring the background
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Improving composition
• Rule of thirds
• Simplicity
• Angle and perspective
• Framing
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Have a strong center of interest
• Take pictures at different angles with different compositions
• Work around the rule of thirds
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Simplicity
• One strong center of interest– Foreground or background should be simple or
complimentary to center of interest– Include foreground or background for sense of
isolation, distance, depth, etc.
• Avoid mergers
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Cut offs
• Avoiding cutting out parts or wholes of people or main subjects
• Avoiding cutting out the path of a moving object
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Give the object somewhere to go
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Working with angles
• Low angles– Clear sky backdrop– Accentuate movement or action
• High angle– Eliminate cloudy sky
• 45 degree angles will cut glare
• Avoid centered horizons
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Framing
• Adds depth• Should fit theme• Helps subject fill the frame• Can block unwanted subjects from view• Watch focus on foreground
– Focus on foreground in landscape– Focus on subject in portraits– Auto-focus should be centered on main topic– Overall—DEPENDS ON CAMERA
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Balance
• Balance color and weight in a picture
• Formal and informal
• Symmetrical and asymmetrical
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Symmetrical
Asymmetrical
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Fill the frame
• Would this picture look better if I was closer?– Focus on subject– Detail
• Start far and move closer
• Fill the frame with objects that “fit”
• Long range shots provide depth and perspective
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Digital issues
• File formats
• Scanning
• Printing
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Native file formats
• Format used by computer program
• Retains ability to edit within native program
• Unreadable on WWW or graphics programs
• Product families (Adobe, Microsoft, etc.)
• Examples– .ppt, .doc, .mix
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Nonnative file formats
• General formats that multiple programs can open– .gif, .jpg, .tif, .bmp
• Formatting cannot be undone within a program – picture must be reedited
• Save pictures in both native and nonnative file formats
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Resolution
• Quality of the pictures on a screen, print, or file– DPI = dots per inch (printer)– PPI = pixels per inch (screen)
• More resolution means higher file size
• Different file types contain more or less information (resolution)
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Resolution and bits
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Tagged Image File Format
• Very flexible and can be opened by most programs
• Saves as pixels• Scan as a .tiff or as a native file format if
possible
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EPS files (vector)
• Only some programs use: FreeHand, Illustrator, CorelDraw
• Saved as separate images not as pixels – no resolution lost with resizing
• Use the “Options” button under PRINT in PageMaker to save as EPS
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Graphical Interchange Format
• Great for the WWW
• 8-bit – 256 colors (indexed color)
• Usually set at 72 pixels for the WWW
• Allows for transparency
• NOT used in printing
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Portable Network Graphic
• 24-bit (millions of colors)
• Transparency with jagged edges
• Alternative to the .gif
• Newer computer programs only
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Joint Photographic Experts Group
• 24-bit color
• Lossy compression
• You can usually set your compression here
• Best for WWW pictures
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Portable Document Format
• Embeds all data into a single file– Fonts– Format– Pictures– Text
• Works on any computer with reader• Standardizes your document• Work on WWW and as attachments
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Postscript files
• Will print on any postscript printer
• Do not need program to output data
• Print to file
• Make sure you know what kind of printer you are dealing with
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PNG – GIF – JPG - TIF
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General rules
• Scan a photo as a .tiff file
• For web pictures, use .jpg
• For print pictures, use .tiff or vector format at a minimum of 300 dpi
• When possible, scan/save the picture at the size to be used – 300 dpi will look poor if enlarged
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RGB Color
• Red-green-blue
• Monitors and scanners determine level of the three to put on a pixel
• Light directly into the eye = cannot look the exact on paper
• Out of gamut (cannot be printed in CMYK format)
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CMYK Mode
• Cyan-Magenta-Yellow-Key (black)• Commercially output documents or special
printers– Four-color printing– Process colors
• Color bounces off object and onto your eye• Get a process book or color guide to select
(Pantone, Tru-Match, Agfa)
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Comparing the two
• RGB have smaller file sizes
• RGB has some features that the other does not
• Convert between the modes at the end or you will lose information
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Understanding resolution
• Resolved to our eyes = realism and accuracy
• Printer = DPI
• Monitor = bit depth (colors displayable)– 72 ppi is good enough for electronic photos
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Understanding pixels
• Picture elements (dots) per inch
• Standard monitor displays 640 by 480 pixels– 640 by 480– 1024 by 768
• More pixels requires more RAM, which may mean lower bit depth
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Enlarging with pixels