![]() ![]() In general images can be enlarged by up to a maximum of 20% from this result, but after that the quality deteriorates visibly.įor commercial litho print (leaflets brochures etc), enter output dpi as 300.įor large format exhibition prints, enter 75 in the dpi output box to find out the largest the image can be on an exhibition print. Commercial print requires 300 dpi, our large format printing requires at least 75dpi and home desktop printing requires at least 72dpi. Having read the pixel size as outlined above, use the calculator below to find out the size at the dpi output required. You don't need to know how this works, just to be able to enter the correct output dpi in the calculator below. What determines the final possible output size is the dpi (dots per inch) required by the print method. The size we can print successfully is a correlation between the number of pixels and method of printing. Note also that this operation works with tif, bmp, jpg, png and bmp files, but not with eps files. NB if you right click on a picture on a website and go to Properties, you will also find the pixel dimensions. You can now see the number of pixels (ignore the resolution for the moment). In the Summary box, left click on the Advanced button. In the Properties dialogue box, left click on the Summary tab.ģ. ![]() Right click on the image file wherever you have stored it and select Properties.Ģ. If you are used to editing images you will have a program like Photoshop which will tell you all the details in the 'Image Size' menu option, but if you are only have MS Office programs and the like on a PC, you can find out the details in the following way (this method is based on Windows XP: for Vista & Windows 7, look at the Details tab under Properties).ġ. How can I tell number of pixels in an image file? Home desktop inkjet printing can be successful at about 1/4 of the pixels required for commercial litho printing. If an image is too small for the intended size and just scaled up in the design software, the printed result will be 'pixelated' with the pixel blocks showing and with jaggy edges to elements in the image. Screen use does not demand a great number of pixels (standard computer screens are often set to 800 x 600 pixels or more commonly now 1024 x 768 pixels for the whole screen area).Ĭommercial print, however, requires images to have a lot of pixels if they are to be printed at any decent size (e.g. The number of pixels in an image determines the size it can be used for various uses. How do I know if a picture is good enough to print at the size I want? Jpg, gif and png are all file types that have been compressed down (and the amount of compression can be varied according to the program default or the user), so the filesize is no clear indication of what the expanded size will be. We can often tell suitability from file size but this only works with tif, bmp and eps files. The size at which we can use an image depends on what it is intended for - screen visual or print. ![]()
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