The only way for you to accuratly reproduce a raster image file is to have graphics software to keep track of the exact location and color of each pixel in the whole collection of pixels, thats a lot of information. File size becomes a big issue when scanning and creating raster images. When the file sizes star to get bigger it becomes an issue because big files make your computer processor and hard drive work overtime. Your typical 2" by 3" 150 dpi black and white raster logo is about .07 megabytes or less then 70k in file size. That same file saved as a 300 dpi 24 bit raster image logo might be 100 times larger, over 7 megabytes. In order to transfer big files (over 1 megabyte) you must have high speed internet connection on both ends for timely uploads and downloads.
Common raster image formats are JPEG (Joint Photographics Expert Group), PCX (Paintbrush), TIFF (Tag Interleave Format), BMP (Windows Bitmap), PNG (Portable Network Graphics), CPT (Corel PhotoPaint), and PSD (Adobe PhotoShop).
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