The graphic resolution is the quality of an image, that is the quantity of pixels present in a linear inch.
The size of an image in pixels is the amount of pixels present along the width and height of an entire image. (example: 1280 x 720 px).
This means that taking into account a portion of an image (a line one inch long, therefore 2.54 cm), the amount of pixels present in that portion will be the actual resolution (i.e. sharpness) of the image.
DPI stands for dots per-inch. For dots we mean the printing points, that is the definition of printing. It is specifically used for printing.
PPI stands for pixels per inch (pixels per inch). It is (or should be) used for the web (or in any case for the screen image). We say should because now, for reasons of speed/convenience, we are using the term dpi for both display modes.
So summarizing:
PPI = image dedicated to the web (generally on screen)
First of all, it is good to know that the higher the value (be it DPI or PPI), the higher the resolution and therefore the quality, the sharpness of an image. The lower the value, the lower the resolution, so the image will be grainy.
Having said that, for printing the ideal minimum resolution is 300 DPI, but it is also true that for images that are not too large (images to hold in your hand, to look at a few centimeters away, a magazine for example) you can also print at 150 DPI.
In any case, if you have to print an A5 poster for a customer (therefore for commercial purposes), as a good graphic designer’s rule; never print below 300 DPI.
It goes without saying that 72 PPI images are created and used for the web.
So, of at 300 the quality is better, why not use this parameter also for the web?
Simple! Because first of all on screen this value is totally irrelevant. You can set an image to 10 or 1000 ppi: the image on the screen will be the same (it changes instead if it comes to printing, you will see the difference of the same image at 72 PPI and at 300 DPI i from a distance). The important factor to consider is the weight. If we found only 300 DPI images on all websites, you would notice it for the time it would take to load each page.
Whit Pronto Pricelist there is the possibility to choose the format in which the PDF file is generated:
– Paper: 300 DPI suitable for four-color letterpress printing (CMYK)
– Web: 72 DPI suitable for web publishing in three colors (RGB)
– Compressed web: 72 DPI suitable for smaller three colors (RGB) web publishing.
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