ug141 - week 5 (graphics)
DESCRIPTION
TRANSCRIPT
Johny Hizkia Siringo Ringo BIT (Multimedia Tech.), MIMS (Soft. Dev.)
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GRAPHICS
UG141 – Multimedia Design
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Role of Graphic
• Graph and Chart
• Photograph or images
• Background metaphor
• Animated graphic
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Graphics – Some Terminology
• Pixel: A digital image consist of many picture elements
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Graphic – Some Terminology
• Resolution: The number of pixel determine the quality of the image (higher = better)
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Vector Vs Bitmap
• Vector
– is represented as geometric shape (lines and arc) and is stored as mathematical instruction.
– Example: SVG
• Bitmap
– is represented as pixel and stored
– Example: bmp, jpeg
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Vector
• Advantages of using Vector – Can be modified without affecting its quality
– Smaller in file size
– Ideal for animation and design
• Disadvantages of using Vector – Not a popular format
– Limited to certain programs like spreadsheet or graphic program
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Bitmap
• Advantages of using Bitmap
– Popular formats such as JPEG, BMP, and others
– Scanner normally output images in bitmap formats
• Disadvantages of using Bitmap
– Hard to be modified without affecting the quality
– File size can be large
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Bitmap
• Quality of Bitmap is determined by screen resolution and color depth (range of color available for pixels, measured in bits)
• File size = image in pixels * color depth in bits.
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Vector Vs Bitmap Bitmap Graphic Vector Graphic
Simple matrix or grids of dots with color information. Think about an array of colored dots that when seen from distance forms an image.
Image data are stored in the form of: • Data points which describe the collection of lines, curves, circle, etc
Smallest elements of a bitmap is a pixel The information of the images can be stored as coordinates.
Bitmap images get grainy and pixilated when zoomed in
The computer recreates the image based on the information describing the image
Best for large image with different colors Easily scaled without quality loss
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Vector Vs Bitmap
PROGRAM FILE EXTENSION BITMAP VECTOR
Adobe Photoshop .psd X
Mac Quikcdraw .pct / .pict X
Targa Bitmap .tga X
Windows Bitmap .bmp x
Adobe Illustrator .ai / .eps X
AutoCAD .dwg / .dxf X
AutoDesk Draw .cdr X
Windows Metafile .wmf x
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Guidelines for using Graphics
• Avoid using graphic that do not add value to contents
• Consider using thumbnails, when dealing with graphics
• Use quality graphic that adds value to content
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Graphic Authoring Tools
• Paint Program
– MS Paint
– Adobe Illustrator
• Image editing program
– Photoshop
– Gimp
– Corel Draw
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Graphic Authoring Tools
• Task to Perform:
– Crop: removing unwanted section of an image
– Enhance: Improving the quality or remove defects due to resolution and contrast
– Filter: Sharpening / Distort an image
– Layering: Using additional image in layers
– 3D Imaging
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GIF (Graphics Interchange Format)
• A bitmap image format
• Supports up to 8 bits per pixel (256 color)
• Using lossless data compression
• Usage: – GIFs are suitable for sharp-edged line art (such as
logos) with a limited number of colors.
– GIFs can be used to store low-color sprite data for games.
– GIFs can be used for small animations and low-resolution film clips.
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GIF (Graphics Interchange Format)
No color information lost
Compress line art well
Support transparency, interlace, animation
Advantages
Can only have maximum 256 colors
Does not compress photographs well
Copyrighted format
Disadvantages
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PNG (Portable Network Graphics)
• A bitmapped image format
• Employs lossless data compression
• Improve upon and replace GIF
• Support palette-based images (24-bit RGB)
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PNG (Portable Network Graphics)
No color information
Support more than 16.7 million colors
Compresses images well
Support transparent, interlace
Advantages
Not all supported by web browsers
Disadvantages
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Interlace/progressive
Begins with a low-resolution image and increases details as the file continue to load.
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JPEG (Joint Photographic Experts Group)
• Used method of lossy data compression
• The most common image format used by digital cameras and other photographic image capture devices
• Supports up to 16.7 million colors
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JPEG (Joint Photographic Experts Group)
Support a maximum 16.7 million colors
Compress photographs well
Support progressive images quality
Advantages
Losses some image information
No transparency
No animation
Disadvantages
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Summary
• Decision factors: • Support by the browsers
• Colors – photo-like image
• Transparency
• Animation
• Interlacing