pictures & graphics by Patrick and David content 1. 2. 3. 4. 5. 6. 7. definitions focus: pictures JPEG GIF TIFF comparision focus: graphics definitions PICTURES: are matrixes of individual points (pixels) with color-informations GRAPHICS: are objects of vectors (with color information) that are placed upon eachother focus: pictures File - Examples are: .jpg (.jpeg) .gif .tif (.tiff) .tga .psd .png JPEG data compression with high losses varying levels of compression with varying loss of detail compression up to 5% of normal size throws away some of the graphic data 16,7 mio. colors JPEG (2) JPEG (3) Advantages standard image format for Web pages small file size 32-bit color Disadvantages compression loses data software compatibility problems not transparent JPEG (compression & quality) 181.8 KB 16.1 KB 10.3 KB GIF standard bit-mapped graphics file format developed by CompuServe supports 256 colors has extra functionality, concerning transparency and animation techniques patented by CompuServe GIF (2) Advantages standard image format for Web pages supports transparent, interlaced, and animated images 8-bit (256) color Disadvantages not supported by most word processing programs limited color depth GIF (3) construction GIF (4) examples TIFF (Tag Image File Format) Type: Bitmap Colors: 1- to 24-bit Compression: Uncompressed, RLE, LZW, CCITT Group 3 and Group 4, JPEG Maximum Image Size:232 poorly portable between different applications very variable format, which offers many possibilities, but the format is to understand with difficulty ultimative comparison .jpg(90) .gif .tif graphics (vector-) advantages easier to scale often in ASCII-format easy to convert into other file types, like .bmp Disadvantages complex pics are hard to store representation depends on user application and output device review 1. 2. 3. 4. 5. 6. 7. definitions focus: pictures JPEG GIF TIFF comparision focus: graphics that‘s it! any QUESTIONS ?!?