How many MegaPixels does my scanned image have?
• Let’s use an example to explain this. If you want to scan your 4×6 photo at 300 dpi resolution, you will end up with an image at 1200 x 1800 pixels. Multiplying both of those numbers you get 2,160,000 pixels or 2.16 Megapixels. • You can also find out how big your file size would be by using the following calculations: 1 pixel is made up of 3 primary colors = RED, GREEN, BLUE (RGB for short); A computer stores data in bytes and there is 1 byte for each of the primary colors. So, 1 pixel = 3 bytes. Therefore, in our example above, 2,160,000 x 3 would be 6,480,000 bytes. However, this is just a rounded answer because in reality, the following exists: 1,024 Byte = 1 Kilobyte; 1,024 Kilobyte = 1 Megabyte; 1,024 Megabyte = 1 Gigabyte • So, the correct value is calculated as follows: 6,480,000 * 1/1024 * 1/1024 = 6.1798095 Megabytes or 6.18 MB for short. • Be sure to understand that this would be an uncompressed file such as a TIFF file. JPEG images are compressed, so the file size would b
