Translator for PPI, distance and maximum size
Which size is required for original pictures? Which is the maximum size for a picture? find answer here
FAQ- basic knowledge
Ppi? Dpi? Is there a difference? Viewing-distance? What do I need when? find answer here
ppi= pixel per inch, dpi=dots per inch
Ppi indicates the resolution, how many pixel per inch are to be displayed. However, dpi indicates the number of printer dots, that can be placed within the span of one inch.
The dpi-value has influence on the print quality only, not on the picture size. On the contrary, ppi has influence on the size and quality. A small print/ copy of only 180 ppi being viewed from a close range, is not effective, but is of poor quality. A large picture of 180 ppi in contrast is more effective, due to a longer viewing- distance. Hence the eye can't perceive the richness of detail anymore. A picture of 180 ppi should be looked at at a distance of 30 cm.
The smaller the ppi- value is, the greater has to be the distance. Some examples: At a distance of 20 cm, one should at least have 275 ppi; at a distance of 100 cm, everything over 55 ppi is adequate.
Ppi? But the resolution is called dpi, isn't it? find answer here
Dpi is used wrongly in popular parlance. Dpi does not indicate the ratio of pixel and the printing size, but merely the quite unknown resolution of the printer dots. For 4 colour- prints one pixel consists of four little colour drops, that are right beside each other, so that the human eye cannot distinguish them. Thus. these four colour dots blur to an uniform shade of colour. 1 pixel consists of exactly 300 printer dots at 300 dpi and 1 ppi. That single pixel stays constantly one inch long though. Albeit at 300 dpi or 1200 dpi.
Important: If you want to check it yourself, open an image editing application, where one can regulate the dpi individually and type 100 once, another time 300. As long as the lengths of pixel remain constant, the pictures are identical large. It does not matter if 1 dpi or 2000; the picture remains the same size, but the printing quality varies.
What are ppi? Does that also exist in cm? find answer here
Ppi (pixel per inch) indicates the ratio between pixel (px) and the unit of length inch. 1 ppi means that exactly one pixel is placed within the span of one inch. One inch is 2.54 cm long. Some programmes are also supportive of the indication pixel per cm, but this is not common.
How many pixel does one inch/cm have? find answer here
Pixel (px) are only linked to the unit of length inch by ppi. Without an indication of ppi, one cannot make a statement about how many pixel are in one inch (2.54 cm).
Translate pixel to cm? Translator for dpi to cm? find answer here
There is no equation like 1 pixel (px)=cm
One pixel corresponds exactly to 2.54 cm (1 inch) at 1ppi, but it does not work without.
FAQ- Print and print preparations
Which colour mode should I use for printing? find answer here
By default, print jobs are dealt with in CMYK, everything else results in colour shifts. Basically one should always confer with the accomplishing print shop.
Which size do data require? find answer here
There are two possibilities. Either the data are attached to the printing object and missing areas become black/white or the data is cropped. Generally the trimming/ section is at 3% at all sides. Fonts should always have a minimum space to the edges; how much that is and how many % are trimmed, is what you can always enquire at the accomplishing print shop.
Which file format should be chosen for printing? find answer here
It is advisable to send data as PDF to the print shop, because JPG, PNG and GIF can easily achieve 100 megabyte, respectively are unsuitable by reason of losses in quality or the so-called JPG- artefacts as well. Here is essential, too, to confer with the print shop.
