2 Basics of Digital Images (1) - Image Data Representations 1 Contents Image Data Types Black&white images 1-bit images 8-bit gray-level images Color

2 Basics of Digital Images (1) - Image Data Representations...

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1 Image Data Representations
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2 Contents Contents Image Data Types Black&white images 1-bit images 8-bit gray-level images Color images 24-bit color images 8-bit color images Popular File Formats GIF JPEG Others
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3 Images come in many different format Photographs Paintings Drawings Symbols Corporate logos Flags Maps Diagrams Graphs ...
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4 Images can be used to Provide facts. Explain a process. Set a mood. Evoke an idea. Pinpoint locations. Illustrate relationships. Tell stories. Compare. Identify. ... 1. Napkin 2. Salad Fork 3. Dinner Fork 4. Dessert Fork 5. Bread and Butter Plate With spreader 6. Dinner plate 7. Dinner Knife 8. Teaspoon 9. Teaspoon 10. Soup Spoon 11. Cocktail fork 12. Water Glass 13. Red-wine glass 14. White-wine glass 15. Coffee cup and saucer
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5 Image Representation Image Representation Bit map techniques Bit map techniques Pixel-by-pixel representation of the color Pixel-by-pixel representation of the color : short : short for “picture element” for “picture element” Wide range of colors and shades in complex Wide range of colors and shades in complex images images Pixel-by-pixel modifications Pixel-by-pixel modifications Vector techniques Vector techniques comprise mathematical representations comprise mathematical representations Scalable Scalable Small file size Small file size
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6 File Sizes File Sizes
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7 Digitization An image is broken into thousands of pixels. An image stored in this way is called a bitmap. Pixels are represented by three numbers. Red 0-255 Green 0-255 Blue 0-255 #1A FF C4
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8 Color definition in HTML Color definition in HTML <body bgcolor="#00DDFF"> <body bgcolor="#00DDFF"> <body bgcolor="rgb(0,0,0)"> <body bgcolor="rgb(0,0,0)"> <body bgcolor="black"> <body bgcolor="black">
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Graphics/Image Data Types The number of file formats used in multimedia continues to proliferate. For example, this table shows a list of some file formats used in the popular product Macromedia Director.
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10 Graphics/Image Data Types
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11 Bitmap Images Bitmap : The two-dimensional array of pixel values that represents the image data. Image resolution: width x height dots per inch/cm
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12 Image resolution refers to the number of pixels in a digital image : width x height (higher resolution always yields better quality). Fairly high resolution for such an image might be 1600 x 1200, whereas lower resolution might be 640 x 480. 2048×1536 = 3,145,728 pixels or 3.1 megapixels
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13 Image resolution may refer to the number of pixels in an certain area.
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14 Frame buffer : Hardware used to store bitmap. Video card (actually a graphics card ) is used for this purpose. The resolution of the video card does not have to match the desired resolution of the image, but if not enough video card memory is available then the data has to be shifted around in RAM for display.
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15 File size = File size = width x height x #ofBytesPerPixel = resolution x bit depth (without compression) (without compression)
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  • Fall '16
  • Dr.Murat Koyuncu
  • File format, Portable Network Graphics, Image file formats, Tagged Image File Format

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