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MaWD 2.02 Raster

Lesson 2.02 Raster Graphics Vocab

TermDefinition
Graphics anything on a page that is not actual text, from simple line drawings to fully active images found on the World Wide Web. The two major categories of graphic images are raster and vector.
Color depth refers to the number of colors per pixel that can be displayed in an image and affects image quality and file size.
Compression refers to the mathematical algorithm used when an image is saved in order to reduce the file size. The greater the compression, the lower the quality of the image.
Lossless no data is lost during compression.
Lossy some data is lost during compression.
Portability ease at which files are opened, modified, and viewed on computers using different operating systems, software and browsers.
Transparency the background of an image is " see-through" so that the graphic can blend into the background without having a white box around it.
inches the standard unit of measurement for US standard size papers that can work well for print.A " Letter" size piece of paper measures 8/5" x 11", which is the most common size used in printers, for resumes, and other common desktop publishing documents.
Pixels the most common unit of measurement used for computer screen display. A pixel generally represents on dot that is illuminated on a computer screen, many of which make up images. Pixels lack flexibility as screen size changes.
Points the standard unit of measure for typefaces, with 1 point representing 1/72 of an inch. 12 point font is generally accepted as the standard font size for paragraph text in print.
Picas a unit of measure for lines of type with one pica equal to 1/6 of an inch. Therefore, there are six picas in one inch. Picas are often used in print design, as they are more easily divisible than inches, such as with the Rule of Thirds.
Resolution the amount of detail stored for an image. The higher the resolution, the higher the level of detail in the image.
PPI The number of pixels in one inch. More pixels per inch means better image quality but larger file size.
On-screen resolution documents that are being sent for print should be 300PPI to ensure image quality.
DPI the number of dots of ink or toner per inch on a printer image. The lower the DPO the less detailed the Image.
Color Mode a mathematical model that describes the way colors can be represented as number nor percentages, typically with three or four values.
RGB assigns an intensity value to each pixel that ranges from 0 to 255for each of te red, green, and blue components in an image. If all of the RGB values are 0 the result will be black. If all the RGb colors are 255 the results willbe white. RGB color is bes
CMYK assigns a percentage value for each of the process inks. If all the percentage are set to 0, the results will be white. An image should be converted to CMYK color mode before print.
Raster graphics also called bitmaps, are images composed of grids of pixels that have a fixed resolution and cannot be resized without losing image quality. Raster graphics are edited in paint programs. Comprised of small dots called pixels, with each pixel assigned a co
Raster commonly used fpr Digital photograph. modifying or adding effects to images, such as filters or blurs effective for web design or images for print mediums, such as magazines.
Advantages of Raster handle small details, such as those in photographs, fairly well. Handle modifications and effects well.
Disadvantages of Raster Resolution Dependent- the quality of the image is determined by the number of pixels in the image, which cannot be re sized without affecting image quality. File sizes can become very large.
Native file formats editable file formats that are proprietary to a specific program that generally lacks portability and is not meant to be used with other software.
Standard file formats file formats that can be used with a variety of software programs, Standard file formats are usually created by using the " Save As " command or through exporting. Standard file formats include, but are not limited to : .gif, .jpg, .png, and tiff
Psd Photoshop Document: Native file format for
GIF Graphics Interchange Format: Standard format on web for animation. Supports transparency. Uses lossless compression. Supports 256 colors. Commonly used for: Clipart, animations,icons,logos,simple diagrams, line drawings, graphics with large blocks of a si
JPEG Joint Photographic Experts Group: Does not support animation. Dose not support transparency, Uses lossy compression. Supports 16 million colors. Highquality. commonly used for: Desktop publishing images, photographs and natural artwork,scanned images, ema
PNG Portable Network Graphic: Supports transparency. uses lossless compression. Supports several diffrent color depths including 256 colors and 16million colors. Commonly used for replacing GIF and TIFF images, online viewing of images.
TIFF Tagged Images File Format:Does not support animation or transparency. Available in compressed and uncompressed formats. Supports up 16 million colors.
Pdf Portable Document format: Open standard, platform independent format that embeds fonts, images, layouts, and grpahics allows choice of lossy and lossless compression. Supports 17 million colors. Viewable with Acro bat Reader. A free program by Adobe.
Aspect Radio relationship of an objects width to its height. Maintaining aspect ratio while modifying an objects size ensures the object is not distorted.
Cropping removing a part of an image. The original image retains the same file size. The cropped image can be saved as a new object.
Created by: meechaj
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