#How to calculate screen dpi full#

Just giving the resolution is not good enough.ДЇigure 5 Above is the full image. DPI means 'dots per inch' but you need to know how many inches to know the file size of an image. What they have told you is that they want each inch of your image to have 300 dots, but they haven't told you how many inches they want the image to be.В It is the number of pixels in an image that determine file size resolution by itself is not enough.ДЇigure 4 This is one inch of the image below. This is the same as someone saying, 'Oh, just give me a 300 dpi image'. Yes it may be 70 kilometers per hour, but you need to tell them for how many hours. That is because you only told them half of the answer. But what do they mean by a '300 dpi' image? This is rather like someone asking you how far is it from Abuja to Lagos and you answer '70 kilometers per hour'. So often people speak about a 300 dpi image as being a quality image. Both resolution and image size need to be used together. This means that when talking about the working file size of an image it is not enough to just state the resolution or image size by itself. The smaller image only has enough pixels to display well at that size. While both look good now, what differs is the size at which the image is displayed. Both images now have the same resolution, it is now the image size of each that is clearly different.ДЇigure 3 Here the same two images are now set to the same resolution. Since the pixels are now set to the same resolution, it is the image, or document size, that shrinks or expands to fit. The picture below has too few pixels and so have resized to the point where the pixels are larger than the monitor dots and the image looks either bad, or even useless as in the 12вЂ‰xвЂ‰8 pixels image.ДЇigure 2 Although blown up to the same size as the previous image, this image is made up of only 120 x 80 pixels and now we are starting to see the actual pixels, which is called 'pixelation.'Д«elow are the same images as before but resized so that the pixel resolution is 72 dpi to suit the monitor. The image above has a pixel size smaller than the monitor dots and so looks good. The aim is to have enough pixels, which when resized to fit the image size, are smaller than the monitor or printer dots. So while both 'image sizes' may be the same, the resolution of each is clearly different.ДЇigure 1 This image is made up of 1200 x 800 pixels and looks to the eye like a scene might look in reality. But each copy is made up of a different number of pixels which just expand in size to fit the image size. Below the same image is shown twice, both times at the same image or document size. You will need to log out and log back in before any of these settings take effect.Pixels have no set size, they just expand or contract to fill the space available. Find the line which looks like this:ДЇor example, a 15' monitor would have this line: etc/X11/XF86Config-4 but it may be in different locations depending on your distribution. You can correct it by editing your configuration file as root. You can discover the value it believes you have by running this command: Your X Server for example, performs a calculation of your DPI. There are other places in Linux where DPI values need to be set. Or, if that's too complicated, you can use the Javascript below. The first number is the horizontal width and the second is the vertical width, in pixels.ДЇor most monitors (those with a 3:4 aspect ratio) the calculation is easy: If you don't know your screen resolution, you can run this command to find out: The size is measured along the diagonal, and is usually the size which is advertised when you purchased your monitor. To figure out your monitor's current DPI, you need two pieces of information: The size of your screen, and the current resolution. Entering the correct value in your font DPI settings helps ensure that text displayed on your screen will appear at the same size when it is printed or displayed on another screen. It changes depending on the size of your screen and the resolution (total number of dots, or pixels) it is set to display. The DPI of your monitor is a measure of how many Why would I want to set this value, and how do I figure out what it is? When I open the font settings capplet and click on details, I see that I can set the resolution or dpi of my monitor.