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What is VGA & how is different from a Mega pixel |
ajeetpv
Joined: Apr 23, 2006
Posts: > 500
From: India
PM |
hi,
i have SE k700. on the back it is written "VGA 4.1 mm 1:2.8"
and how is this different from a mega pixel camera.
can any body help me out what does it means???
thanx!!!
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masseur
Joined: Jan 03, 2003
Posts: > 500
From: Sydney, London
PM |
VGA is 0.3 megapixel
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vrl29
Joined: Dec 25, 2004
Posts: 305
From: Philippines
PM |
a picture is composed of a collection of dots called pixels. pixels determine the size of the picture, and the more pixels a camera can generate, the bigger the picture will be. the k700 has a VGA camera, it stands for 0.3 megapixels, or million pixels. it is derived by multiplying the maximum height and width of the picture (640x480 = 307,200 pixels, or 0.3 mega pixels).
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watermelon
Joined: Dec 24, 2005
Posts: 69
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300,000 effective pixels, as in K750/W800/W810 it is 2,000,000 effective pixels O_O!!! Now for 10 megapixels it is 10,000,000!!!! sorry lol. |
ajeetpv
Joined: Apr 23, 2006
Posts: > 500
From: India
PM |
thanx,
but it also hav a extendable picture size of 1280x960.!!!
how this happens thru a VGA camera?? |
masseur
Joined: Jan 03, 2003
Posts: > 500
From: Sydney, London
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software in the phone mathematically interpolates the pixels actually taken in the picture to make more pixels where it thinks they should/would be
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tranced
Joined: Jan 19, 2006
Posts: > 500
From: Santo Domingo, wonDeRland
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@ajeetpv: thanks for making the question. I always wanted to know that.
@masseur: thanks for replying.
I love this page
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vrl29
Joined: Dec 25, 2004
Posts: 305
From: Philippines
PM |
as masseur have said, the 1280x960 option on the K700 is the interpolated picture. interpolation (by definition in the web) is the increase of image resolution by the addition of new pixels throughout the image, the colors of which are based on neighboring pixels. that way, you'll get a bigger picture at the expense of sacrificing quality. the camera of the K700 is designed to have a maximum output of 640x480 pixels (also known as VGA), but the 1280x960 option works like this: it captures the picture as 640x480, then resizes the picture twice its size (hence the 1280x960 pixels). that's why you may notice that in the 1280x960 mode of the K700, it takes a few seconds processing and saving the picture than in the 640x480 mode. 
and as for the topic question, VGA differs from a mega pixel by picture size. as we all know by now, VGA stands for a picture that's sized at 640x480 pixels. multiply those two, and you get 307,200 pixels (or 0.3 mega pixels). mega stands for million so a mega pixel means a million pixels. for example, a camera that can generate a picture size of 1280x960 without the use of interpolation can generate 1,228,800 pixels, or 1.2 megapixels; they just round it off to make it 1.3 mega pixels. some  phones like that are the S700i, W550i, and the K600. camera phones like the K750i, W800i, and the W900i can generate pictures with a size of 1632x1224 (again without interpolation), hence producing 1,997,568 pixels, or 1.9 megapixels. again, they just round it off to make it 2.0 mega pixels...
whew! it may sound too technical for some, but i hope that answers the question about pixels in camera phones...
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[ This Message was edited by: vrl29 on 2006-04-25 00:53 ] |
dr_thug
Joined: Nov 11, 2004
Posts: > 500
From: India
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Thank You vrl29.that was very informative yet easy to understand.
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shadoweaver
Joined: Jan 08, 2004
Posts: 101
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this is a short but very informative, and helpful, thread... |
blackspot
Joined: Sep 06, 2004
Posts: > 500
From: Philippines
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BTW, for those who don't know yet, VGA stands for Video Graphics Array - which was used to call old monitors / graphics cards that support 640 x 480 resolution (On the days of the PC-XT/AT and CGA monitors, VGA was very impressive, imagine that!). Nowadays VGA is used to call displays / cameras that use 640x480 pixels resolution.
resistance is futile. |
vrl29
Joined: Dec 25, 2004
Posts: 305
From: Philippines
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thanks for the compliments... it sure feels good to be of help to others... 
as for blackspot's post, that was the history of VGA (the term is actually used in old monitors to depict a display of 640x480 pixels, 640 characters in 480 lines); it was just adapted for pictures because they both had the same size...
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[ This Message was edited by: vrl29 on 2006-04-25 10:18 ] |
ajeetpv
Joined: Apr 23, 2006
Posts: > 500
From: India
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thanx 2 both masseur & vrl29 for this information |
carkitter
Joined: Apr 29, 2005
Posts: > 500
From: Auckland, NZ
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As I understand it, the resolution is most relevant when enlarging or printing the pictures. I've printed pictures from Z600 (0.1 Mp), K700i (0.3 Mp) and V800 (1.3 Mp). When printing on 6"x4" photo paper Z6 pics were a waste of time, K7 were acceptable and V800 were very good, just lacking a little in sharpness compared to my wifes conventional 35mm film camera.
Of course things go downhill when it comes to printing on A4 paper. K7 pics look poor and V800 rate only acceptable. This is where you need a 2.0 Mp or a 3.2 Mp cameraphone.
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blackspot
Joined: Sep 06, 2004
Posts: > 500
From: Philippines
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For printing I always consider 175 dots per inch (dpi) to be a good resolution (that's when the picture appears to have a continuous tone). Printing 640 x 480 image to a 6" x 4" output would only have around 107 dpi and as @carkitter rightly described it, it's just acceptable but not really good because at this printing resolution the square pixels are still very discernable.
IMO VGA is only good up to 3.7"x2.7" pictures, 1.3MP for up to 7.3"x5.5", and so on...
resistance is futile. |
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Posted: 2006-04-23 11:34
jay0726 | 
