Vocab - Raster Graphics (Strand 5) Flashcards
Raster Graphics (Bitmaps)
Is a grid of individual pixels that collectively compose animage.
Raster Image Quality
Max image resolution/size is set and cannot be increased without altering the quality of the image.
Raster File Formats
PSD, GIF, JPEG, PNG, TIFF, BMP
GIF- Graphics Interchange Format
Animation standard format for the internet. Transparency Small color range (256) for display on computer Small file size
JPEG- Joint Photographic Experts Group
Commonly used for photographs
Pixelated compression
No Transparency
No Animation
PNG- Portable Network Graphics
Primarily Used for Web Graphics
Lossless Compression
Transparency
Not suited for photographs
TIFF - Tagged Image File Format
Best for bitmap images you want to edit
Used for Photography
Lossless Compression
Used for high quality scans, can store multiple pages
Safe for use, contains no links or hidden data
PSD - Adobe Photoshop Document
Is the default file format for saving in photoshop. Supports multiple pictures, objects, filters, text, and more, as well as using layers, vector paths and shapes, and transparency.
DPI
Dot Per Inch - is used to describe the resolution number of dots per inch in a digital image
PPI
Pixels Per Inch - is used to measure the pixel density of an electronic image device, like a computer monitor or TV. The devices resolution.
Alpha Channel
Is an 8-bit layer in a graphics file format that is used for expressing translucency
Layer Mask
Is a reversible way to hide part of alayer. This gives you more editing flexibility than permanently erasing or deleting part of alayer, also known as non-destructive editing.
Image Resolution
The total number of pixels in an image. Also used to describe the width and height of an image.
Lossless image format
Capture all of the data of your original file
Lossy image format
Use compression to remove image data and color to reduce file size. (JPEG)
