Paniting programs presentation
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- Paint programs create bitmap images made of pixels, where bitmap images are made up of individual pixels arranged in a grid. Higher pixel density means higher resolution, which is measured in dots per inch (DPI) or by the number of pixel rows and columns. - Compression reduces the file size of images and affects download speed, with lossless compression maintaining all pixel data and lossy compression changing some pixels. The most common formats are BMP, TIFF, JPEG, GIF and PNG.
Paniting programs presentation
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- 2. Painting Programs Paint programs create bitmap images made of pixels. A bitmap (raster image) is an image made of pixels. Greater pixel density gives greater resolution. Resolution is defined as dots per inch (DPI) or by the number of pixel rows and columns (640x480).
- 3. Compression The longer the internet bandwidth, the faster the download time of a picture. Bandwidth is the speed at which a computer can transmit information along a network. Compression in graphic files is the process of reducing the size of an image. Lossless compression does not change any pixel data. Lossy compression reduces or changes some pixels while making the file smaller. It also distorts the image.
- 4. BMP (Bitmap) Most common bitmap file is a BMP(bitmap) Usually used in word processors File is often quite large Limited to 256 colors Work well with Microsoft Windows
- 5. TIF/TIFF (Tagged Image File Format) File type works well in all environments (Even Face book!) Files are quite large Are NOT compressed Used for high resolution printing Many cameras use TIFF as their picture format
- 6. GIF (Graphic Interchange Format) Developed by CompuServe Only uses 256 colors File sizes are quite small Used to create line drawings, images with transparent backgrounds, and animated figures
- 7. GIF continued GIF compression is lossless using the LZW (Lempel-Ziv-Welch) formula GIF can be version 87a or 89a Most users choose 89a for its ability to make the image transparent. Both Photoshop and Paint Shop Pro offer version options
- 8. GIF continued A GIF can also be interlaced or noninterlaced Interlaced images load onto a web page in stages until max. resolution is reached Noninterlaced images build from the top down until a complete image appears Both Photoshop and Paint Shop Pro offer interlacing choices
- 9. JPG/ JPEG (Joint Photographic Experts Group) Uses up to 16 million colors Most digital cameras use JPG as their picture format Allows you to choose the amount of compression you want Standard encoding draws the image on the screen only when the complete picture has been transferred Progressive encoding displays the image in stages
- 10. PNG (Portable Network Graphics) Retains 16 million colors Has some valuable features Not supported by all web browsers