Multimedia part 1 Flashcards
Computer Graphics ?
It’s representation of image data by a computer specifically with help from specialized
such as : Hardware: Graphics Cards and Cameras
Software: Adobe Photoshop and Unity
Graphics Terminology ?
Pixels ( smallest element in an image)
( square shape)
Image Dimensions ( Is measured by the Width x Height of a digital image )
what are the types of graphics ?
Bitmap Graphics ( Raster graphics)
Vector Graphics ( object oriented graphics)
what is bitmap Graphics ?
Painting pixels on the screen with a pointing device like mouse
Capturing an image with a digital camera
Is a rectangular grid of pixels , with each pixel being specified by number of bits ( like file formats) ( Painting software’s like MS paint)
what is vector Graphics ?
Pointer movements translated into lines and patterns on screen using mathematical formulas
Color depth / bit depth ?
Is the number of bits devoted to each pixel
Simple bit mapped (monochrome) ?
Each pixel represented by 1 bit
Can be 0 or 1 -> Black or White
How to calculate the file size of a simple bitmap image with dimensions 250x 200 ?
Total Number of pixels in the image = 250 * 200 = 50,000 pixels
File size = 50,000 pixels * 1 bit/pixel = 50,000 bits
[1 byte = 8 bits]
Gray- scale graphics ?
Uses 8 bits per pixel ( ex allows up to 256 different shades )
How to calculate the file size of a gray scale image with dimensions 250 x 200 ?
Total Number of pixels in the image = 250 * 200 = 50,000 pixels
File size = 50,000 pixels * 8 bit/pixel = 400,000 bits ~ 50,000 bytes
Color depth ?
Modern PCs uses 24-bit (True Color) to display millions of colors at a time , photorealistic color such as RGB: (Red, Green, Blue)
what is Resolution ?
Is a measurement of the pixel density of an image measured in ( inch ppi)
What is object oriented Graphics / ( vector Graphics) ?
Are scalable graphics that are built using mathematical formulas
Advantage of it ?
That they can be resized without losing image quality like : Drawing software’s ( Inkscape)
Differences between Bitmap and vector ?
Bitmap ( stores as dots )
More memory / Good for paintings
Texture and shading
Vector ( stores as objects)
Less memory / Lines cleaner
Good for graphs , charts ( 3D)
Image processing ?
Filtering and cleaning : ( Eliminate red eye)
Enhancing and editing :
Can distort and merge photos as in tabloids
Can create fabricated images (which looks real)
What are examples of image processing ?
Medical field help doctors clean x ray images
Natural language processing ?
Cleaning Captcha Phrases
