dpi of photos?!once they have been uploaded to computer?

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M3_csl

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Hi,

When I load the pics up on to my mac they seem to be 72 dpi is this right? even when i set them to raw files they are 72 dpi. Do i then just change then to 300 dpi in photoshop and is it usual for pics to load up as 72 dpi from the camera?

Sorry if seems a stupid question , im learning.

Thanks guys!


(I have a canon 400d)
 
short answer yes, camera is 72dpi but the actual physical size of the image will be around A3-A2+.

In photoshop if you go to image and tick on/off can't remember which, the bottom box selection, then type in 300dpi the image will resize itself to the maximum physical size for 300dpi which will be around say A4. HTH.
 
The reason it's 72dpi is that is the maximum dpi that your computer monitor supports.

Higher dpi settings than that are only used by printers. :)
 
I'm a printer and I need at least 300dpi :D
 
Well actually I'm not a printer, I'm the front end man Repro and boy do I need 300dpi, the amount of times I get less than 300dpi (150 and below) and customers wonder why their pics look rubbish.
 
Fair does. I sometimes wonder how much some printing houses know about dpi or colour space for that matter. ;)
 
We actually scan at 406dpi which is optimum for our RIP. We also convert all pics to CMYK from RGB, strip out colour profiles and apply our own GMG profiles ISO 27L at the moment, which is then press matched to our Roland presses.

But the GMG software is first class pretty much industry standard, we have had various proofs in from companies using GMG on different proof printers (Canon/Epson Large format), but you will always find that if we calibrate test their proofs they will always pass which is quite good.
 
CT said:
The reason it's 72dpi is that is the maximum dpi that your computer monitor supports.
Click to expand...

:nono:

Hasn't been that way for a long time. Most monitors are 96dpi now, 72 DPI is from ages back when 14" monitors were state of the art.
 
Ok.. can someone explain in terms for me, so idiots guide style...

If I submitted a photo that I'd been manipulating in photoshop for printing to A1 size, how would it go from being 72dpi, to Glens requirement of 300dpi, at the right size.

Sorry thats prob a really thick question, but I don't get it :D :thinking:
 
pxl8 said:
:nono:

Hasn't been that way for a long time. Most monitors are 96dpi now, 72 DPI is from ages back when 14" monitors were state of the art.
Click to expand...
b****r! :D
 
mattyh said:
If I submitted a photo that I'd been manipulating in photoshop for printing to A1 size, how would it go from being 72dpi, to Glens requirement of 300dpi, at the right size.
Click to expand...

Ok A1 is 27.8x39.4"

If you wanted to print that at 300 DPI you simply do the following:

27.8*300=8340
39.4*300=11820

So you'd need an image 8340x11820 pixels to print it A1 @ 300 DPI.

In reality A1 doesn't need 300 DPI because viewing distance plays a factor as well - to view an A1 you'd stand back a few feet so 100 DPI would probably be acceptable or 2780x3940 pixels.

DPI is the value used to translate physical size into pixels and back again. Although an image can have a DPI value stored in its data it doesn't actually mean anything about the quality.

Dots Per Inch and Pixels Per Inch are really the same thing but Dots is traditionally used by printers who printed everything with little tiny dots. These days we use pixels as Dot gave up the printing game and moved to the East End :D
 
Generally if you are printing anything larger than A3 you don't need to set it to that size at 300dpi. e.g. for an A1 size image at 300dpi you'll end up with a massive file and secondly it will take your printer ages to rip it (get it ready for printing).

Best thing to do is ask your printer what size they require the image and then set it to 300dpi at that size. From past experience they usually require quarter size artwork for anything A2 & above, i.e. for an A2 printout you would send your image in A4 size at 300dpi
 
pxl8 said:
Although an image can have a DPI value stored in its data it doesn't actually mean anything about the quality.
Click to expand...
If there's one thing amongst all the replies in this threads that you want to remember, this is it.

The only thing that really matters is how many pixels you have. Most printers will ignore the PPI setting anyway and print at whatever size you tell them to.

For instance, a 24"x16" print at 300 PPI requires 7200x4800 pixels. But many photo printers (such as PhotoBox, which I use) will quite happily take an image straight out of my 350D which is 3456x2304 pixels and print it at the size. The PPI setting in the image is irrelevant.
 
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