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Maximum people of our society think, high megapixel camera means high quality photo, but this is not always true. We will have to confirm that the camera produce 300 dpi photo. DPI means “Dot Per Inch”. After opening any photo by Adobe Photoshop, click on “Image” menu, then “Image Size” sub-menu. Now see the Document Size. It will tell you:

Resolution:  “___”  pixel/inch

Always remember that 300 pixel/inch (dpi) is best. To set any taken photo as computer wallpaper, we never need any camera of more than 16 Megapixels, but it will have to produce 300 dpi photos. You are suggested to check camera or mobile phone in Adobe Photoshop or any other software in camera or mobile shop. To make it more clear, here are two charts for you:
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Megapixels vs. Maximum Print Size Chart

Megapixels
Pixel Resolution*
Print Size@300dpi
Print size@200dpi
Print size@150dpi**
3
2048 x 1536
6.82" x 5.12"
10.24" x 7.68"
13.65" x 10.24"
4
2464 x 1632
8.21" x 5.44"
12.32" x 8.16"
16.42" x 10.88"
6
3008 x 2000
10.02" x 6.67"
15.04" x 10.00"
20.05" x 13.34"
8
3264 x 2448
10.88" x 8.16"
16.32" x 12.24"
21.76" x 16.32"
10
3872 x 2592
12.91" x 8.64"
19.36" x 12.96"
25.81" x 17.28"
12
4290 x 2800
14.30" x 9.34"
21.45" x 14.00"
28.60" x 18.67"
16
4920 x 3264
16.40" x 10.88"
24.60" x 16.32"
32.80" x 21.76"
35mm film, scanned
5380 x 3620
17.93" x 12.06"
26.90" x 18.10"
35.87" x 24.13"

*Typical Resolution. Actual pixel dimensions vary from camera to camera.

Digital Camera Resolution Chart : The following chart can be used as a guide to help you decide what resolution camera you should purchase

Capture Resolution
Video Display*
Print Size***
2x3"
4x5"/4x6"
5x7"
8x10"
11x14"
16x20"
20x30"
320x240
Ok
Good
Ok
Poor
Poor
Poor
Poor
Poor
640x480 –
0.3 Megapixel
Good
Super
Good
Poor
Poor
Poor
Poor
Poor
800x600
Super
Photo Quality
Very Good
Ok
Poor
Poor
Poor
Poor
1024x768
Super
Photo Quality
Super
Good
Ok
Poor
Poor
Poor
1280x960 –
1 Megapixel
Super
Photo Quality
Photo Quality
Very Good
Good
Poor
Poor
Poor
1536x1180
Super**
Photo Quality
Photo Quality
Super
Very Good
Ok
poor
poor
1600x1200 –
2 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Very Good
Ok
Ok
Poor
2048x1536 –
3 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Super
Good
Ok
Ok
2240x1680 –
4 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Very Good
Good
Ok
2560x1920 –
5 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Super
Very Good
Very Good
3032x2008 –
6 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Super
Very Good
3072x2304 –
7 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Super
Super
3264x2448 –
8 Megapixel
Super**
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Super
10 Megapixel +
Super**
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality
Photo Quality












Poor: Noticeably Grainy (pixelated)
Ok: Obviously not a real photo, but some details are visible
Good: Can tell it is not a photo but most details are discernable
Very Good: Can tell it is not a photo at normal distance, but good enough for many uses
Super: Difficult to tell from real photo at normal viewing distance
Photo Quality: On a photo-quality printer, the human eye should not be able to tell the difference at a normal viewing distance

* Either television or computer display (e.g. Web Page)
** Will produce an excessively large file size that would be inappropriate for web applications
*** Using a typical Photo Quality Desktop printer