Can someone tell me how an image be 72 72 px/in, another for example 139 by 54 px/inch?

I guess that 72 of 72 means that 1 inch in length there are 72 pixels on the x stand, and there axises. If the resolution is not a measure in square inches? It would be logical but... Thanks for the help!

Any raster image is composed of a finite number of pixels (color values). But the number of pixels to cover an inch (PPI) is simply a matter of scale.

Example:

An image contains 10 x 10 pixels.

If the image is resized proportionally occupy a 1 inch space of 1 inch (1 square inch), the PPI is 10, measured vertically and horizontally.

If the same image is resized proportionally occupy a 2 inch by 2 inch space (4 square inches), the PPI is 5, in both directions.

If the same image is resized disproportionately more to occupy a 1 inch (vertical) (horizontal) 2 inch space (2 square inches), its horizontal PPI is 5; its vertical PPI is 10.

Leaders of the Illustrator indicate no pixels of raster page images, even when the unit of measure is set to "pixels". It wouldn't make sense for them to do, because any number of raster images may exist on the page, and each could evolve differently (giving each a different PPI). Illustrator is an object oriented program. Even if its leaders are on the misleading 'Pixels' leaders are still on linear measure, not to the count of pixels (as in Photoshop).

A pixel is not a unit of linear measure. A pixel has no linear measure until give you him effectively, by specifying its scale (size on the page). Because a pixel is not a real unit of measurement, and since leaders of the Illustrator always indicate linear measure, Illustrator must use a real unit of linear measure when it is set to "Pixels". It uses 1/72nd inch as the unit, which is, by definition, the same measure of a Point. When you set the illustrator of 'Pixels' rules, you are really affecting points.

For this reason, Illustrator considers a raster image that is placed on the page to be scaling '100% ' when it is adjusted to the 1-point-per-pixel, which is 72 pixels per inch

JET

Tags: Illustrator

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