Ann Ware Digital Imaging 101. Digital Image Categories BITMAPVECTOR A bitmap is an image created with pixels (small squares of color) The number of pixels.

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Presentation transcript:

Ann Ware Digital Imaging 101

Digital Image Categories BITMAPVECTOR A bitmap is an image created with pixels (small squares of color) The number of pixels in an image determines the quality of the image (resolution) Resizing can result in pixelation A bitmap is also known as a raster graphic A vector is a graphic image that is drawn mathematically When a vector is resized, the formula is recalculated The image will have the same quality—no matter what size

Painted on a grid Drawn mathematically

Bitmap Software Bitmap images can be created with a digital camera, scanner, or by using a painting program like Paint, Photoshop. To edit a bitmap image use a digital imaging program like Photoshop, GIMP, Picasa. Definition: Painting software — a program used to create bitmap images; useful in creating original art because it provides the tools used by artists (such as brushes and pens)

Most Common Bitmaps BMP—Bitmap JPEG—Joint Photographic Experts Group GIF—Graphics Interchange Format TIFF—Tagged Image File Format PNG—Portable Network Graphic

.bmp Largest graphic file size, generally not compressed Supports 16.7 million colors Files created in PAINT are typically bitmaps Not appropriate for the web or attachments

.jpg Best choice for photos Compressed file format (lossy) Supports 16.7 million colors Does NOT support transparency or animation Appropriate for web pages Definition: lossy compression—A compression formula that reduces the size of a file by removing certain pixels.

.gif Compressed file format (lossless) Supports: Transparency Animations 256 colors Appropriate for web pages Best choice for graphic images Definition: lossless compression—a compression formula that reduces the file size without data loss

.tif Not compressed—large file size Supports 16.7 million colors With certain software, TIFF files can support transparency Does not support animation Can be used for photographs Not appropriate for web pages or attachments

.png Compressed file format (lossless) Supports: 16.7 million colors Transparency Animation Excellent for photos

.bmp 4.21 MB.gif 657 KB.jpg 360 KB.tif 4.21 MB File conversion—The process of saving a file in a different file format than its current format; example: converting a JPEG to a TIFF

Vector Software Vectors can be created using the drawing/shape tools in Publisher, PowerPoint, Word or PhotoShop. Vector software is described as drawing software—vectors are DRAWN, not painted. Adobe Illustrator and Corel Draw are drawing programs Definition: Drawing software—a program used to create vector graphics; provides for freehand as well as geometric shapes

Metafiles Most clip art in the Office gallery are metafiles and have the file extension.wmf If you can ungroup an image and edit it, you are probably working with a metafile. Metafiles are a Microsoft vector image

Other vectors Graphs / charts (Excel) Scalable fonts Times New Roman