What the hell is DPI?

What the hell is DPI?

The reason I wrote this blog was due to a certain experience in the past.
The Team Leader didn't know what the hell DPI was.
And after realizing that he's just a noob trying to do something big, everyone quit.
Of course, the Project got cancelled and we worked for free for 2 weeks.

Anyhow, It stands for [Dots per Inch]

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In Computer Graphic, 2D image size is measured in Pixel, AKA Dots.

How large is a Pixel? It has no actual size in real life space.
Vice Versa,
km,m,cm,mm, etc have no actual meaning to computer space.

Thus came DPI.

DPI is a measurement conversion of real measurement to computer space.
1DPI means there is a Pixel per real life numerical Inch.

For example,
Standard A4 paper's size is [210mm*297mm] or [8.27in*11.69in]

A common DPI for detailed illustration is 300DPI
8.27*300 = 2481
11.69*300 = 3507
Which means that A4 in 300DPI is equivalent to [2481px*3507px]

As long as this proportion is kept, it has pretty much the same meaning as
A3, A2... A0 ... A_NegInf



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Thus, if the Project Leader told you to

[We need it big, so make it an A1 size], but didn't tell you the DPI.
or
[Make it 1024*1024, 600DPI to make it more detailed]






there's a good chance that your project will fail due lack of technical knowledge of the Project Leader.