# Thread: How many pixels I need?

1. ## How many pixels I need?

Hello all,

Have been wondering: if i wanna print an A4 size pic, how many pixels do I need to get an good pic?

Thanks!

2. ## Re: How many pixels I need?

Originally posted by rapidmax
Hello all,

Have been wondering: if i wanna print an A4 size pic, how many pixels do I need to get an good pic?

Thanks!
Photo Quality printing is 300 dpi ( dot per inch )
A4 = 8.3 x 11.7in
= (8.3 x 11.7) x 300
= 2490 x 3510
= 8739900
= 8.74 megapixel
so it is abt. 8.74 megapixel to print an A4 size pic in 300 dpi.

3. ## Re: Re: How many pixels I need?

do note that you can get decent A4 sized prints even from a 3.3Mp camera.

otherwise, you can interpolate your images in PS.

4. Does interpolation means that your image quality is lost? how does it work?

5. A measely 2mp camera can already do decent 8x10 (close to A4) prints.

Interpolation is just a technique for inventing something from nothing (in this case, making up pixels from nothing, based on other pixels).

Regards
CK

6. Originally posted by ckiang
A measely 2mp camera can already do decent 8x10 (close to A4) prints.

Interpolation is just a technique for inventing something from nothing (in this case, making up pixels from nothing, based on other pixels).

Regards
CK
Yep. Second that.

7. shooting at 1600 X 1200 =1920000
File Size = 1920000 X 3 =5.76MB

Image dimension = (1600 / 72) X (1200 /72) = 22.22 Length X 16.6 Breath

If u wanna print e pic wif a printer having 200 DPI output-resolution, change yr image of 72 DPI to 200 without re-sampling e image n e picture dimension will change to:
(1600 / 200) X (1200 / 200) = 8" X 6"
Of cos U can print a larger pic by re-sampling or interpolation but in throry, it will degrade e pic.
wif gd re-sampling software, e degradtion is negligible but work within the range of 6 to 6 times e original pix dimension. Thus. u could hv a print size up to 18" X 24" taken by a high end consumer camera n a print size as big as 36" X48" taken by a professional high end camera

8. ## Re: How many pixels I need?

The general rule is,

1MP - 3" X 5" Print

2MP - 5" X 7" Print

3MP - 8" X 10" Print

4MP - 9" X 12" Print

5MP - 10" X 14" Print

Originally posted by rapidmax
Have been wondering: if i wanna print an A4 size pic, how many pixels do I need to get an good pic?

9. hi,
Is there any difference in quality printing 4R if I use 3.3MP compared to 6.1MP?

TIA!

10. ## Re: Re: How many pixels I need?

Originally posted by ivor
The general rule is,

1MP - 3" X 5" Print

2MP - 5" X 7" Print

3MP - 8" X 10" Print

4MP - 9" X 12" Print

5MP - 10" X 14" Print
There's quite a big jump from 2MP to 3MP. 3MP contains 50% more pixels but according to the general rule, could print more than twice the area.

11. At the risk of sounding like a show-off....

Go down to Kim Tian Color Centre and see the cat prints they put up lor. Those are 2mp shots (up to 10R).

Blk 531 Upper Cross St
#01-06 Hong Lim Complex
Singapore 050531
Tel : 6538-1422

Or you can go over to my friend's lab at Bt Batok
Miao Lann Colour Centre
Blk 154 Bt Batok St 11
#01-302 S(650154)
Tel : 6425-0239
Ask for Kelvyn or Alfred

Ask to see Azure's prints. Easy way to settle, no?

12. Originally posted by E-Lim
hi,
Is there any difference in quality printing 4R if I use 3.3MP compared to 6.1MP?

TIA!
The difference will be negligible.

Regards
CK

13. Originally posted by Azure
Yep. Second that.
With all the camera manufacturer's marketing flak, now every other person think that you need a 6mp++ camera to do 8x10/A4 and that 2-3mp cameras are useless at achieving that.

I still remember in the good old days, the marketing flak of 2mp cameras say "Print up to 8x10"

The proof is always in the final print. A well captured and processed 2mp shot can indeed be printed to at least 8x12" (I've been there done that). I've also successfully printed 10x15" from a 3mp camera.

Regards
CK

14. Yup, CK, that's why I loved my late 950 so much.

Of course, basics of a well-taken pix will have to be there lah. If one gets a 6Mp cam and takes a bad shaky shot, even 3R size may not hide it.... Then again, a good 2Mp shot can suffice even for offset printing. Have seen some of my clients use 2-3Mp shots and they turn out better than re-scanned 4Rs in their annual mag.

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•