Re: DPI

In message <6d349$4636e8a7$3e18e6cb$26024@xxxxxxxxxxxxxx>, Richard Polhill <richard.news@xxxxxxxxxxxxxxxxxxxxx> writes
no Spam wrote:
In message <59mmntF2ku1boU1@xxxxxxxxxxxxxxxxxx>, Ron Recer <ron48@xxxxxxx> writes

"Nospam" <nospam@xxxxxxxxxxxxxxxxxx> wrote in message
news:w4tsYrCY3hNGFw+C@xxxxxxxxxxxxxxxxxxxxx
Could some one tell me in simple language or point me to a web site to
answer the following question.


I have read that cameras work on 72 dpi

Cameras work on pixels. Dpi is an expression of resolution for PC monitors,
printers, scanners etc. For instance, most computer monitors are only
capable of displaying 72-100 dpi. Frequently computer software used for
editing/displaying/printing photos may have a 'default' of 120 dpi, for
example, and may tell you that a 3000 x 2000 pixel photos will be 25" x
16.7", if you change the software setting to 300 dpi it may then say the
photo will be 10" x 6.7". If the device you are printing/displaying the
photo on doesn't have the resolution to display 300 dpi, the software will
do its magic and reduce the photo resolution to match the display device for
size photo you requested.

so how do u print to 300 dpi?

Not sure about the technical side yet.

Maybe I'm mixing up the wrong things!

I am sure you can find web sites that will explain it much better than I
have. If someone doesn't post a link, try a google search.

Ron

thanks
-- Nospam


Thanks, that makes more sense.

So if I have this right.

My LCD monitor has a resolution of 1280 x 1024

its physical measurements (approximately no need to be too exact in this example)

are 14.8 inches x 11.8 inches

so

1280 / 14.8 = 86 monitor pixels per inch

1024 / 11.8 = 86 monitor pixels per inch

so for my monitor to display 300 dpi it would need a resolution of

4440 x 3540 assuming the physical size remains the same.

(Above current technology - at a reasonable price anyway)

but as my printer can print at 300 dpi I should see a better resolution on the prints, all being equal.

I understand that there are lots of other things that affect image quality.

But I know understand what the specs mean.

thanks

Well yes. Printers are finer-pitched. Screens are anything from 70 - 130 DPI, so when rescaling images for on-screen use, 100DPI is a good value to think of to get an image the size you want give or take 25%.

I don't know of any display technology that can give anything approaching 300DPI but I don't doubt a laptop manufacturer will try it at some point. Just imagine the size of the 32x32 icons! Smaller than 3mm/side!

Well the DPI value doesn't affect quality as such. It affects the size for a given number of pixels. I.e. a 3000px wide image at 300DPI will be 10 inches wide. If you could print at 600DPI then it'd be 5 inches wide. It'd LOOK more detailed because it's finer, but the same amount of detail is present.

If you print your 3000px wide image on your 300DPI printer at any size smaller than 10 inches, you'll be resampling the image and losing detail. But at 300DPI, you probably won't miss the detail.

Worry most about getting good photos to start with, then when you print them bear in mind your printer's limitations. You may get better results resampling the image in your editor specifically for the print size you want at 300DPI than just letting the printer driver handle it. You'll have to test both methods, but I bet you'll not be able to tell the difference.

Thanks for the information it was most useful.

It all makes sense now.


--
Nospam
.

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