150dpi, 200dpi or 300dpi?


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jacob

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#1
hi there,

is there any visible difference between 150dpi, 200dpi and 300dpi on 4R size printouts?

advice please..........
 

theRBK

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May 16, 2005
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#2
from normal viewing distance of about 30cm using only the eyes (not with a magnifying glass...) probably not... do note that I assume this "dpi" mentioned here is what you supply to the printer, not what the printer actually uses to print on the paper (desktop printers accept the image you provide and then converts it to a "pattern" of dots to actually print it at usually a standard resolution, which depending on the brand may be 300, 360, 720, 1440, etc.)...

if talking about the printing process, what the printer actually uses to print, then yes, the difference may be visible... :)
 

ilario

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#3
For printouts you should always use a high DPI. However this term is misleading, DPI actually is obsolete, it is the PPI (pixels per inch) that actually makes the difference. I'm also kinda confused but on print you'll see the difference, not on screen. a 50dpi vs a 800dpi on screen is identical, just bigger file size. But print that out and you'll see :)
 

catchlights

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#4
if you are taking about photo printing at digitlabs, minimum requirement is 250 PPI, send them files in 300 PPI are very safe, eg 1800 x 1200 pixel for 4R photos
 

theRBK

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#5
For printouts you should always use a high DPI.
not necessarily... the human eye can only resolve a certain amount of detail and to print more detail than that might not be necessary... :)

However this term is misleading, DPI actually is obsolete, it is the PPI (pixels per inch) that actually makes the difference.
actually, DPI refers more to prints, where the image is made up of printed dots... whereas PPI refers more to monitors, where the image is made up of pixels... but in general discussion, they are usually not differentiated... so I wouldn't exactly call DPI obsolete... ;)


I'm also kinda confused but on print you'll see the difference, not on screen. a 50dpi vs a 800dpi on screen is identical, just bigger file size. But print that out and you'll see :)
that's because the image on screen is still displayed at the monitor's resolution, which for LCDs is fixed... whereas in prints, the image might be printed at different resolutions... :)
 

jacob

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#6
if you are taking about photo printing at digitlabs, minimum requirement is 250 PPI, send them files in 300 PPI are very safe, eg 1800 x 1200 pixel for 4R photos
yes i'm talking about photo printing at digilabs(like those normal neighbourhood photoshop).

i'm trying to use photoshop CS to change the sizes. my basic requirements is:
1) to print out at 4R size.
2) to have the right resolution for 4R size yet discouraging the receipient to blow up the picture as he'll be given the soft copy for 4R.

so what should my resolution be base on my requirements above?

thanks in advance for any responses......;)
 

catchlights

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#10
but he can do resize to 8R right?
he can't print straight to 8R, else will have pixelation, and have to using software interpolate the image to 8R, with some lost of details.

you can try to print a 8R from interpolated small file and 8R from a large original file to see the difference.
 

Fragnatic

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Jan 24, 2008
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#11
yes i'm talking about photo printing at digilabs(like those normal neighbourhood photoshop).

i'm trying to use photoshop CS to change the sizes. my basic requirements is:
1) to print out at 4R size.
2) to have the right resolution for 4R size yet discouraging the receipient to blow up the picture as he'll be given the soft copy for 4R.

so what should my resolution be base on my requirements above?

thanks in advance for any responses......;)
send them a 300dpi one lor... for 4R it is 1800 x 1200 pixels.
else a 250dpi one: 1500 x 1000 pixels.

come on, they handle many many photos. they wont steal ur photo or blow it up. at most they see it only. haha.

if u don't trust them, then print it at home urself :bsmilie:
 

catchlights

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#12
send them a 300dpi one lor... for 4R it is 1800 x 1200 pixels.
else a 250dpi one: 1500 x 1000 pixels.

come on, they handle many many photos. they wont steal ur photo or blow it up. at most they see it only. haha.

if u don't trust them, then print it at home urself :bsmilie:
I think Jacob is referring to his customers, something like pay little money get small files, pay more money get full resolution files.
 

Fragnatic

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Jan 24, 2008
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#13
I think Jacob is referring to his customers, something like pay little money get small files, pay more money get full resolution files.
ahh... did he mention? ok maybe i missed out that point.

i think 300dpi is reasonable. it is the recommended standard for printing (i think). 1800 x 1200 isnt that high res. he can print out any size of cos, but 4R or smaller sized print for optimum quality.
 

jacob

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#14
I think Jacob is referring to his customers, something like pay little money get small files, pay more money get full resolution files.
that's right ben. that's wat i meant.

just want to find out which dpi and quality settings for jpegs gives good 4R prints yet cannot blow up to 8R.

some people expect an elephant for a peanut. i just wanna give well shaved monkey for tat peanut.:bsmilie::bsmilie:
 

theRBK

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#16
test print at various resolutions and see which is the minimum acceptable to you... that's the only way you can judge what is acceptable to you... one thing is you have to balance not giving high res files with the final delivery quality for the clients...
 

jacob

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#19
test print at various resolutions and see which is the minimum acceptable to you... that's the only way you can judge what is acceptable to you... one thing is you have to balance not giving high res files with the final delivery quality for the clients...
ended up with some printouts but yet to go through them yet. might post the result out.
 

lsisaxon

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Nov 29, 2004
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#20
wah pro, btw how to hv 1px X 1px at 300dpi? can show me some samples?
tq:embrass:
Can.. just that the image physical size is 1/300" x 1/300" lor..

Anyway, my point is dpi or ppi doesn't mean anything if you don't include the image size or physical size. It's just the relationship between the image size in pixels and the physical size in mm or inches.
 

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