Page 1

INTRODUC TION TO THE DIGITAL IMAGE

MICHELE ALBERA IED TORINO

TRANSPORTATION DESIGN ACADEMIC YEAR 2017 - 2018


RASTER - MANY INFORMATIONS - FIXED SIZE - DEPENDENT ON RESOLUTION .GIF .JPG .TIF .BMP .PNG

DIGITAL IMAGE TYPES

VECTOR

CHARACTERISTICS

- LITTLE INFORMATION - VARIABLE SIZE - INDEPENDENT FROMTHE RESOLUTION

MOST COMMON FORMATS HYBRID FORMATS .PDF .EPS

.SVG .AI .DWG .DXF .SWF


EXAMPLES OF DIGITAL IMAGES RASTER

VECTOR

512 K

4K


EXAMPLES OF DIGITAL IMAGES RASTER

VECTOR


CHARACTERISTICS OF THE RASTER IMAGE

- DEPENDING ON THE DIMENSIONS - THE DIMENSIONS INFLUENCE THE "WEIGHT" - NEEDS A LOT OF INFORMATION - PLENTY OF DETAILS


RASTER DIGITAL IMAGE COLOR SPACE

BITMAP 2

DRAWINGS BW

GREY SCALE 256

DRAWINGS WITH SHADINGS Â BW

COLOUR SCALE 256

DRAWINGS COLOUR

RGB THOUSANDS/ MILLIONS

DRAWINGS COLOUR

CMYK MILLIONS

TYPOGRAPHIC COLOUR PRINT


RASTER DIGITAL IMAGE WEIGHT

PIXELS

RESOLUTION PPI DPI

DIMENSION

CENTIMETERS INCHES WEIGHT IN MB/KB


RASTER DIGITAL IMAGE COLOR SPACE

BITMAP 2

GREY SCALE 256

COLOUR SCALE 256

RGB THOUSANDS/ MILLIONS

CMYK MILLIONS


DIMENSIONS OF RASTER DIGITAL IMAGES • PIXEL (POINTS/DOTS) PRIMARY MEASUREMENT UNIT • RESOLUTION AND SIZE ARE SECONDARY MEASURES • THE RESOLUTION AFFECTS THE SIZE • AT THE SAME PIXEL, INCREASING THE RESOLUTION DECREASES THE SIZE • RESOLUTION AND SIZE ARE INVERSELY PROPORTIONAL • RESOLUTION UNIT OF MEASUREMENT: • PPI = PIXEL FOR INCHES = POINTS PER INCH (VIDEO) • DPI = DOT PER INCHES = POINTS PER INCH (PRINT) • THE MONITOR RESOLUTION IS 72 PPI • THE RESOLUTION FOR PRINTING VARIES FROM 150 TO 300 DPI


DIMENSIONS OF RASTER DIGITAL IMAGES

AT THE SAME PIXEL, INCREASING THE RESOLUTION DECREASES THE DIMENSION


DIMENSIONS OF RASTER DIGITAL IMAGES

AT THE SAME SIZE, INCREASING THE RESOLUTION, PIXELS AND WEIGHT INCREASE


DIMENSIONS OF RASTER DIGITAL IMAGES

RASTER IMAGES CAN BE REDUCED, BUT NOTÂ THEY CAN BE ENLARGED


DIMENSIONS OF RASTER DIGITAL IMAGES AT THE SAME PIXEL, INCREASING THE RESOLUTION, THE SIZE DECREASES • WITH THE SAME SIZE, INCREASING THE RESOLUTION, PIXELS AND WEIGHT INCREASE • RASTER IMAGES CAN BE REDUCED, BUT, IN GENERAL, THEY CAN NOT BE ENLARGED • IN REALITY THE MAXIMUM MAGNIFICATION ALLOWED IS 120% WITHOUT APPARENT LOSS OF QUALITY • VERY IMPORTANT TO CHOOSE THE COLOR SPACE SUITABLE FOR THE IMAGE • IN ACQUISITION CHOOSE THE MAXIMUM SIZE AND THEN REDUCE DURING PROCESSING

Introduction to the digital image  
Introduction to the digital image  
Advertisement