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13 years ago
It is difficult to understand the relation between pixel, dpi and print size. Here are trying to comeout from the difficulty of pixels and their relation with other variables.....
Basically when you are printing/rendering an image you have three variables to consider:
Basically when you are printing/rendering an image you have three variables to consider:
- DPI/PPI (Dots per Inch/Pixels per Inch) Both are known as resolution.
- Pixel size - measured in pixels (this is normally what you render to and is how monitors are measured.
- Print size - measured in inches (can be anythign but I'll use inches for convinience)
a) DPI/PPI
First you need to know what resolution your printer can handle. Some will say that they go to 1200 dpi or 600 dpi, but in practice you should never need to go bigger than 300 dpi, even if you are printing a 60 ft wide billboard. Just like digital camera's non-optical zoom abilities, printers use DPI to claim superiority in the industry.
DPI is the number of dots of ink that are put down by your printer onto a page over a one inch line. The amount of resolution that a printer can achive is based upon how close together the print head elements or jets are positioned. Of course it is a bit different with a 4 color press, but for now I'll just leave it at that. You may also notice that your inkjet will say that the vertical resolution will is different than the horizontal resolution. This is becuase in one axis the printer is relying on the proximity of the jets to each other, whereas the oher diection is related to the sensativity of the rollers that are feeding the paper across the jets.
b) Pixel Size
I'm assuming that everyone is pretty familiar with pixel size as we deal with is on a daily basis. However, don't assume that your print house will be, because in many case they are not. You will usually need to give them an image size in inches based upon the resolution that their printer is capable. Don't try to explain it to them becuase they just won't get it.
Pixels are something that your monitor uses to describe the very small square dots (pixels) of light that are lit up by the guns of your CRT. (LCDs are different) Typically we say that a monitor is 72dpi.
A pixel translated to a page is usually represented by many dots of ink depending upon the print resolution.
c) Print Size
This one is pretty self explantory and is the image size on the page that your printer printed.
First you need to know what resolution your printer can handle. Some will say that they go to 1200 dpi or 600 dpi, but in practice you should never need to go bigger than 300 dpi, even if you are printing a 60 ft wide billboard. Just like digital camera's non-optical zoom abilities, printers use DPI to claim superiority in the industry.
DPI is the number of dots of ink that are put down by your printer onto a page over a one inch line. The amount of resolution that a printer can achive is based upon how close together the print head elements or jets are positioned. Of course it is a bit different with a 4 color press, but for now I'll just leave it at that. You may also notice that your inkjet will say that the vertical resolution will is different than the horizontal resolution. This is becuase in one axis the printer is relying on the proximity of the jets to each other, whereas the oher diection is related to the sensativity of the rollers that are feeding the paper across the jets.
b) Pixel Size
I'm assuming that everyone is pretty familiar with pixel size as we deal with is on a daily basis. However, don't assume that your print house will be, because in many case they are not. You will usually need to give them an image size in inches based upon the resolution that their printer is capable. Don't try to explain it to them becuase they just won't get it.
Pixels are something that your monitor uses to describe the very small square dots (pixels) of light that are lit up by the guns of your CRT. (LCDs are different) Typically we say that a monitor is 72dpi.
A pixel translated to a page is usually represented by many dots of ink depending upon the print resolution.
c) Print Size
This one is pretty self explantory and is the image size on the page that your printer printed.
Sources : Internet & Forum
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