-
1. Re: How can I view resolution in DPI and not PPI?
Omke Oudeman Jul 9, 2009 4:42 AM (in response to Shlomit Heymann)You can't and would have no use for it also. PPI is for digital use (as in
the pixelated images in Bridge) DPI is for analog use, as for a print from a
inkjet printer.
See also this page from Wikipedia:
http://en.wikipedia.org/wiki/Dots_per_inch
Hi all,
Under Bridge>view content as list, I got a column of Resolution but the
mesurement are ppi and not dpi and i need to see the dpi.
Anyone knows where can i set it?
thanks..
shlomit
-
2. Re: How can I view resolution in DPI and not PPI?
Ramón G Castañeda Jul 9, 2009 8:20 AM (in response to Shlomit Heymann)Shlomit,
Strictly speaking, images do not have dpi (ever), only ppi. Images are made of pixels, not dots.
Dpi refers to prints.
However, in everyday use, the terms are loosely used interchangeably. They work out to exactly the same thing (same numbers), but ppi is the correct terminlogy.
See: http://www.scantips.com/basics01.html
DPI, PPI, SPI - What's in a name?
Printer ink dots and image pixels are very different concepts, but both use the term dpi in their own way (dots per inch).
Inkjet printer dpi ratings refer to printer ink dots (the four colors of ink), which is NOT AT ALL the same thing as image pixels. These are such different concepts that some people think we should reserve the term dpi for those inkjet ink dots, and reserve use of ppi only for image pixels. Not a bad plan, except that this view fails to recognize real world usage.
We may hear scanning resolution called spi (Samples Per Inch), and that is indeed what it is. We often hear image resolution called ppi (Pixels Per Inch), and that is indeed what it is. The spi and ppi terms are correct. But historical and common usage has always said dpi for image resolution, meaning pixels per inch, and fully interchangeable with ppi. Pixels are conceptually a kind of colored dot too, and resolution has always been called dpi, for years before we had inkjet printers. Dpi is just jargon perhaps, but it is a fact of life. Scanners and scanner ratings say dpi too, meaning pixels per inch (see dialog pictures here, here, here, and here). I habitually always say dpi myself, but I did try to switch to ppi in the book version.
We may use the term of our own preference, but we need to understand it both ways. Some photo editor programs have switched to saying ppi now, which has much to be said for it. But others have not switched, so insisting on conformity for others to only say ppi will necessarily encounter much frustration, because the real world simply isn't that way, and obviously is not ready to switch yet.
My point here is that we must understand it both ways, because we will see it both ways, often, in the real world.
It's easy, not a problem - the idea of printing digital images is always about pixels per inch, so when the context pertains to images instead of printers, all of these terms, spi, ppi, and dpi, are exactly the same equivalent concept - they all mean pixels per inch.
There is no problem understanding any use of dpi if you know the context. It always means the only thing it can possibly mean. If the context pertains to images or printing pixels, dpi means "pixels per inch". If the context pertains to inkjet printer ratings, dpi means "ink dots per inch". There is no other meaning possible. This should be clear and no big deal - the English language is full of multiple context definitions.
-
3. Re: How can I view resolution in DPI and not PPI?
Shlomit Heymann Jul 26, 2009 6:09 AM (in response to Ramón G Castañeda)thank u very much

