Pixel dimensions

MI
Posted By
martti_i_lappalainen
Jun 5, 2007
Views
269
Replies
4
Status
Closed
Hi,

In image size dialog box you have a value called pixel
dimensions. What is it and how is it calculated and
what is it used for? Help says pixel dimensions equal
document size times resolution, but this does not make sense to me.

Thanks,
Martti
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Don_McCahill
Jun 5, 2007
Pixel dimensions means the number of dots in the picture. A dot will be the smallest element in a picture (one color, with one RGB setting). A 300×300 image will have 90000 pixels. If you print it at 300 dpi, then you will have a one inch square image. But if you use it on the web with a monitor that shows 75 ppi, then it will be four inches by four inches.
RK
Rob_Keijzer
Jun 5, 2007
Martti,

A pixel is a PIcture ELement. The smallest part of an image. Zoom in to the maximum value of 1600% and you’ll see them. A pixel can contain only colour information, no surface detail.

Think of it as an embroidery. If you come up too close you’ll see the elements that make up a picture, but "zooming in" further reveals no details.

A digital image may, for instance, be 1200 x 800 pixels. Those are the pixel dimensions.

Rob
DM
dave_milbut
Jun 6, 2007
The important thing is to use the same units for both the Resolution and the Dimensions.

did NASA get that memo? 🙂
JR
John_R_Nielsen
Jun 7, 2007
One of my favorite lines in one of my favorite movies ("Brazil"):

"Aahhh, they’ve gone back to Metric again, without telling us!!!"

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