How big is a Point?

# Thread: How big is a Point?

1. Junior Member
Join Date
Dec 1969
Posts
3

## How big is a Point?

I&#039;m looking for some answers for my computer class - Our professor wants us to find out how big is a "point". For example, when using 12 point font, how big is each point?

2. Senior Member
Join Date
Dec 1969
Posts
11,247

## RE: How big is a Point?

# 1 point (Truchet) = 0.188 mm (obsolete today)<BR># 1 point (Didot) = 0.3759 mm = 1/72 of a French Royal inch (27.07 mm) = about 1/68 inch<BR># 1 point (ATA) = 0.3514598 mm = 0.0138366 inch<BR># 1 point (TeX) = 0.3514598035 mm = 1/72.27 inch<BR># 1 point (Postscript) = 0.3527777778 mm = 1/72 inch<BR># 1 point (l&#039;Imprimerie nationale, IN) = 0.4 mm

3. Senior Member
Join Date
Dec 1969
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96,118

## Impressive!

I&#039;d always just used 1/72 of an inch!<BR><BR>For what it&#039;s worth, many computer programs interpret a point as the same as a pixel, because the *nominal* screen resolution is 72 pixels per inch. (If you capture an image and show it in PhotoShop, for example, the default resolution is 72 dpi.)<BR><BR>Works out pretty close, actually: 1024 pixels divided by 72 px/inch is 14.2 inches. So an 18" diagonal measure screen (typically the size of a supposedly 19" monitor) being used at 1024x768 resolution really does have very close to 72 pixels per inch.<BR><BR>

4. Senior Member
Join Date
Dec 1969
Posts
96,118

## Ahhh...and...

If we go back to the old "standard" screens: 15" monitor with a 14" actual diagonal viewing area, we find that it has roughly an 11.2" horizontal measurement. And, at 72 pixels per inch, guess what screen resolution fits that nicely? Yep, 800x600!<BR><BR>So there is some consistency to the seeming madness, isn&#039;t there?<BR><BR>

5. Senior Member
Join Date
Dec 1969
Posts
11,247

## RE: Impressive!

I knew working for a print company would have benefits at some point in time!

6. Senior Member
Join Date
Dec 1969
Posts
96,118

## So you are here...

...Prints Charming?<BR><BR>

7. Senior Member
Join Date
Dec 1969
Posts
96,118

## HER, not here...grumble...

...as in "someday her Prints will come."<BR><BR>

8. Senior Member
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Dec 1969
Posts
11,247

## Photographic memory development?

lol ;-)

9. Senior Member
Join Date
Dec 1969
Posts
96,118

## Negative.

Or is that "negatives"?<BR><BR>

10. Senior Member
Join Date
Dec 1969
Posts
661

## But the Best is "The Point"

Not related, but the movie with music by Harry Nielson is magic.<BR><BR>

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