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Mega Pixels
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Jan 18, 2012 09:09:04   #
normanhall Loc: Leslie Missouri
 
here is a formula for figuring image size to megapixels on a camera. i am sure most of you if not all already know this. but i wanted to share in case some don't

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Jan 18, 2012 09:11:14   #
normanhall Loc: Leslie Missouri
 
Image print size 8 x10
To figure megabytes for camera to make great picture at this size you do the following.

I will use a resolution of 300.

The width of the image is 8 inches
8 X 300= 2400
The length of the image is 10 inches
10 X 300 = 3000

Take these 2 numbers and multiply together
2400 X 3000 = 7.200.000
This is the total pixels in the image.
Now divide

7.200.00 / 1.000.000 = 7.2
So in order to get the best quality image at 8 X 10
You need a 7.2 megapixel camera.

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Jan 18, 2012 09:25:18   #
normanhall Loc: Leslie Missouri
 
Image print size 8 x10
To figure megabytes for camera to make great picture at this size you do the following.

I will use a resolution of 300.

The width of the image is 8 inches
8 X 300= 2400
The length of the image is 10 inches
10 X 300 = 3000
i though i posted this but i am not seeing on here so i will post it again. sorry if it is here but i could not find the post.
this is for determining photo size for the size of your camera.
I am sure most of you know this but for those that don't i wanted to post.


Take these 2 numbers and multiply together
2400 X 3000 = 7.200.000
This is the total pixels in the image.
Now divide

7.200.00 / 1.000.000 = 7.2
So in order to get the best quality image at 8 X 10
You need a 7.2 megapixel camera.

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Jan 18, 2012 09:33:25   #
MtnMan Loc: ID
 
Photoshop Elements 10 has at least two ways you can go about changing resolution; perhaps three if there is also one in Adobe Camera Raw (ACR) . I am pretty sure the ACR with Elements 10 is the same as the one you get with Photoshop.

If you use Elements and aren't a real expert on it already you owe yourself "the phtoshop elements 10 book for digital photographers" by Scott Kelby and Mark Kloskowski.

See chapter 3 on "Resizing Digital Photos" (pp. 117), "Automated Saving and Resizing" (pp. 121-122) and "Resizing Just Parts of Your Image Using the Recompose Tool" (pp.123-129).

There is more.

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Jan 18, 2012 09:43:11   #
MtnMan Loc: ID
 
The calculation posted below is fine. Just to note that Kelby suggests you can get acceptable printed pics down to about 180 dpi on a printer and 72 dpi is as much as you need for WEB postings. You'd have to experiment with your picture and images.

Most likely the physical size of the pics your camera produces is actually larger than you need because it is likely based on 72 dpi. So you'll really be reducing the physical size vs. increasing the resolution.

Elements can also resample your image to increase the number of pixels. It is an option. Apparantly it may make your images blurry. You may be abe to recover some of that with subsequent sharpening.

normanhall wrote:
Image print size 8 x10
To figure megabytes for camera to make great picture at this size you do the following.

I will use a resolution of 300.

The width of the image is 8 inches
8 X 300= 2400
The length of the image is 10 inches
10 X 300 = 3000
i though i posted this but i am not seeing on here so i will post it again. sorry if it is here but i could not find the post.
this is for determining photo size for the size of your camera.
I am sure most of you know this but for those that don't i wanted to post.


Take these 2 numbers and multiply together
2400 X 3000 = 7.200.000
This is the total pixels in the image.
Now divide

7.200.00 / 1.000.000 = 7.2
So in order to get the best quality image at 8 X 10
You need a 7.2 megapixel camera.
Image print size 8 x10 br To figure megabytes for ... (show quote)

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Jan 18, 2012 09:46:51   #
tranftc
 
MP issue is multifacets. The size of each Pixel, the number of Ps, and of course the size of the processor are main point. I would like to add one more idea into this issue: the OPTICAL versus EFFECTIVE number of Ps that printed on the cameras should be taken into consideration.
Effective Ps is interpolated . Most of the Camcorders listed
12 MP still picture, but actually the pics taken from camcorders are only 6 MPs.
The finer pixels and the number of Ps serve the quality of the enlargement. NO software can actually increases the number of REAL Ps for you.

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Jan 18, 2012 09:53:15   #
cheineck Loc: Hobe Sound, FL
 
Has anyone tried Genuine Fractals or similar "enlargement" software? I've heard they work using complicated algorithms.

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Jan 18, 2012 09:54:31   #
normanhall Loc: Leslie Missouri
 
are they converting them to vector graphics?

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Jan 18, 2012 10:05:59   #
jkm757 Loc: San Diego, Ca.
 
nnelg wrote:
Just wondering if Photo Shop Elements will increase the mega pixels. My Nikon will shoot 6 mega pixels which limits the size that I can enlarge to. Is there anything I can do outside of buying another camera?


How big do you want to enlarge your pictures? I've got 6 meg pictures enlarged to 13" x 19" that look great. Others on this website have mentioned enlarging a 6 meg to 24" x 36" with no problems.

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Jan 18, 2012 10:06:19   #
docrob Loc: Durango, Colorado
 
nnelg wrote:
Just wondering if Photo Shop Elements will increase the mega pixels. My Nikon will shoot 6 mega pixels which limits the size that I can enlarge to. Is there anything I can do outside of buying another camera?


I do not know about Photo Shop Elements -- on the other hand - YES.
You can easily increase the image size - simply go into the image size dialogue box and increase the size by 10%. You can do this virutally as much as you want. Print labs do this or they will use a fractal program to increase size.......for quality keep the dpi at 250-300 - going to 400 does nothing for the print....and of course....if you have over processed the image all that will be "bigger too."

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Jan 18, 2012 10:07:44   #
cheineck Loc: Hobe Sound, FL
 
You can't convert raster to vector. Completely different operating modes. Maybe someday though!

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Jan 18, 2012 10:11:43   #
cheineck Loc: Hobe Sound, FL
 
At Art Fairs I have seen 20 x 40 and larger prints with virtually no image deterioration. Most shot with regular DSLRs. I'll ask at the next show.

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Jan 18, 2012 10:17:52   #
Turbo Loc: Raleigh, NC
 
just like an audio recording, you can enhance anything !

If you start with a lousy 8-track tape, you will be hard pressed to get a clear, CD quality piece of music.

Similarly, if you have a clear 6 Meg picture to start with, you can use PhotoShop CS4 or CS5 to change the size and the software will linearly expand the picture with enlargement in mind.

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Jan 18, 2012 10:17:53   #
tranftc
 
Yes, good software inceases the number of Ps, but just by interpolating them. The same technic ia deployed in some still camreas too. Real number of Ps are counted.

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Jan 18, 2012 10:48:40   #
alliebess Loc: suburban Philadelphia
 
MWAC wrote:
how big are you trying to print and what camera are you shooting with, megapixels are not created equal.

My 40D Canon is 10 megapixels but the quality of those lonely 10 megapixels is greater than most P&S cameras because of the sensor size.


And with my 5 MP Kodak I made a 16 x 20 - which looks good to this art historian's eyes, although literature said this was above the limit.

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