# Thread: Need help for printing 8R & 12R

1. ## Need help for printing 8R & 12R

How much dpi is needed to print 8R & 12R prints? Is there a formula to calculate?

And where in PS Elements 2.0 can i set the dpi to make the necessary adjustment?

Thanks

2. 300 DPI if I'm not wrong.

3. yup regardless of your size, it is still 300dpi.

i think he may be concerned with his crop dimension.

4. reading your post again, most of the time initial default dimension will normally be greater than 300 dpi. so you do not need to adjust it.

but in the rare circumstances that you have lower than 300dpi to begin with. from 150 dpi you up it to 300dpi. there is a noticeably degradation of the picture. (grain)

5. 300dpi is not really neccessary. 150-200dpi is enough to produce decent images.

6. 8R = 8"x10"
Resolution @ 300dpi = 8*300 x 10*300 = 2400x3000 Portrait Orientation ~=7.2MP
Resolution @ 180dpi = 8*180 x 10*180 = 1440x1800 Portrait Orientation ~=2.6MP

12R = 12"x16"
Resolution @ 300dpi = 12*300 x 16*300 = 3600x4800 Portrait Orientation ~=17.3MP
Resolution @ 180dpi = 12*180 x 16*180 = 2160x2880 Portrait Orientation ~=6.2MP

The above are "recommended" resolution, adjust at one's discretion. Resolution from 150-300dpi will be good enough, any higher DPI count most people will not be able to distinguish the difference.

7. Originally Posted by zekai
but in the rare circumstances that you have lower than 300dpi to begin with. from 150 dpi you up it to 300dpi. there is a noticeably degradation of the picture. (grain)
I believe the term should be noise and not grain for digital.

8. when enlarging, its pixelation. noise is at the production stage on the camera...

neither noise nor grain appears on an image which is enlarged (interplolated) on post production software. that comes from the camera ccd or film...

9. Originally Posted by showtime
when enlarging, its pixelation. noise is at the production stage on the camera...

neither noise nor grain appears on an image which is enlarged (interplolated) on post production software. that comes from the camera ccd or film...
actually they are very similar, btw pixelation and grain.
because the microscopic element of the image is that one pixel on digital. and on trad film, it is that one grain.

so technical accuracy aside, i think he should get what we mean least we get too OT.

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