2 megapixel camera example image
Nappymonst
Using the number of megapixels a camera has, how can i approx. workly out the resolution of the image. I want to work out 16.7 Megapixal - how large would the images be?
Nappymonster
Answer
You've overlooked the elephant in the room: the dpi of the image. Without that figure, the question means nothing.
Say you're doing a billboard at 10 dpi. This means you need 100 pixels/sq inch. 16.7 MP would give you 1160 square feet.
Say you're doing a high-res print at 300 dpi. This means you need 90,000 pixels/sq inch. 16.7 MP would give you 186 square inches.
Do you see the difference?
My rule of thumb that I teach people is this:
1. magazine grade printing requires 300 dpi.
2. 300 dpi means 90K (300 squared) pixels per square inch; in other words, you get 11 square inches of print per meg of pixels.
3. Thus, an 8X10, for example, is 80 square inches and requires 80 X 90K = 7.2 MP.
Screen shots require only 72 dpi, so 80 sq inches of screen real estate takes only 72 X 72 X 80 = 415K. (it doesn't hurt to go up to 100 dpi for screen shots)
It all depends on what you're doing. Large prints and calenders can be done at 150-200 dpi and look OK on the wall, but high-quality publishing always demands 300 dpi.
You've overlooked the elephant in the room: the dpi of the image. Without that figure, the question means nothing.
Say you're doing a billboard at 10 dpi. This means you need 100 pixels/sq inch. 16.7 MP would give you 1160 square feet.
Say you're doing a high-res print at 300 dpi. This means you need 90,000 pixels/sq inch. 16.7 MP would give you 186 square inches.
Do you see the difference?
My rule of thumb that I teach people is this:
1. magazine grade printing requires 300 dpi.
2. 300 dpi means 90K (300 squared) pixels per square inch; in other words, you get 11 square inches of print per meg of pixels.
3. Thus, an 8X10, for example, is 80 square inches and requires 80 X 90K = 7.2 MP.
Screen shots require only 72 dpi, so 80 sq inches of screen real estate takes only 72 X 72 X 80 = 415K. (it doesn't hurt to go up to 100 dpi for screen shots)
It all depends on what you're doing. Large prints and calenders can be done at 150-200 dpi and look OK on the wall, but high-quality publishing always demands 300 dpi.
If a camera has the same amount of megapixels will its pictures look just the same?
xoxoxoxoxo
Camera phones acually.
I'm getting the LG Neon which has 2.0 megapixels,
and i've seen sample photos from the iphone, which also has 2.0 megapixels.
So I wanna know, will a picture taken by the lg neon look the same as a picture taken by the iphone?
thanks!
Answer
No, It simply means that the resolution of your picture would be same but the image quality will depend of the sensor.
For example Canons CMOS sensor is far superior to is Nikon's sensor and thus Canon's photos are better quality than it rival Nikon.
Rohn
No, It simply means that the resolution of your picture would be same but the image quality will depend of the sensor.
For example Canons CMOS sensor is far superior to is Nikon's sensor and thus Canon's photos are better quality than it rival Nikon.
Rohn
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Title Post: How can i work out the dimensions of an image by using just the number of megapixals on the camera?
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