Compression rsity.edu.bd
Formula to Calculate the Memory to Store an Image[(Height in pixels) x (length in pixels) x (bit depth)] / 8 / 1024 = image size in kilobytes (KB). For example, for an image that is 640 x 480 pixels with a 24-bit color depth, multiply 640 x 480 x 16 = 7,372,800 bits. To convert to bytes, that figure must be divided by 8, which equals 921,600. To convert to KB, divide the number of bytes by 1024, which equals 900 KB. Larger sizes can be converted to megabytes (MB) by dividing the number of KB by pressionIf you want your digital image to be a smaller file size, save it in a compressed format, such as a JPG. The resulting size depends upon numerous variables, including compression algorithm, color reductions and compression scale. Compressed files are expanded in RAM memory while being accessed, so this reduced size is a benefit only when storing it in hard drives or memory cards. When a compressed image is opened, it will still take up the same amount of RAM memory as an image that has not been compressed.DPIImages are frequently measured in inches with an associated DPI (dots per inch) resolution. To obtain the height or length of an image in pixels, the height (or length) need only be multiplied by the DPI. For example, a 6-inch x 8-inch photo with 300 DPI is calculated by multiplying 6 X 300 and 8 x 300, which equals 1800 x 2400 pixels.Calculating Maximum print sizes:?As previously mentioned, to view pictures clearly on a computer monitor, the screen only needs an output resolution of 72 PPI or 96 PPI. However, in order for a printed image to be sharp and clear, the output resolution from the printer needs to be much higher. A printer output resolution from 200 DPI to 300 DPI is a good range for making prints from your image files. (that is with 300 DPI being professional grade printing)??It is actually pretty easy to determine the maximum print size you can make from your digital images. First you need to determine how many DPI (dots per inch) will be used when the file is being printed. To keep it simple, lets say the printer output resolution will be 200 DPI. If your image file size is??2,000 X 1,600 you will be able to get a quality print size up to about 10 X 8.The math involved in coming up with that size print is to first divide the number of pixels in the width of the file by the 200 DPI. (2,000/200=10). Next,divide the number of pixels in the height of the file by 200. (1600/200=8). So there you have it. A file size of 2,000 pixels X 1600 pixels can be printed to make a good quality 10 X 8 photo when printed at 200 DPI.If you decide to make a print at 300DPI from the same image file, you will have a print with better resolution. However the maximum size for a quality print will be smaller. Lets do the math.... 2,000/300=6.6. Next, 1,600/300=5.3. So if you round the numbers out, the maximum standard size for that print will be about 7 X 5. ................
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