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Is 7 or 8 megapixls enough to allow printing at A2 size?
Hello,.

I need to buy a camera, compact, around 200 Euro (200 USD /130GBP approx I think). I could go to 250 Euro..

After reading many many reviews I'm attracted to the most recent canon, nikon or lumix in that price range. Brands are in order of preference. They are all similar and all around 7 or 8 megapixels..

The thing I cannot find out on the reviews however, is, if 7 or 8 pixels will give me enough quality (photos taken in optimum conditions with highest resolution and size settings) to be able to print a poster in A2 size. Has anyone done this successfully??.

I will only have to do this from time to time, and the camera will mostly serve as a point and shoot. But I want to know if I'll be able to or not when the time comes .....

Many thanks in advance ....

Comments (15)

The question needs to be asked, from what distance will the poster be viewed?.

In the past I've printed at A4 size from a 2MP camera, which amounts to the same thing technically. I found the result acceptable at the time, though my expectations may be higher now. But the point is, an A4 print is likely to be viewed from close up, while an A2 poster will probably be viewed from further away..

Bearing that in mind, I think it would be good enough, certainly for occasional use.Regards,Peter..

Comment #1

This is quite interesting:http://www.clarkvision.com/imagedetail/eye-resolution.html.

Several people on this form have said that they have occasionally made 30 x 20 inch poster prints from a 6MP (3000 x 2000 pixels) image. That equates to a linear resolution of 100 pixels per inch. if you look at such a print close up it would certainly look a little 'grainy' as 1/100 inch is easily large enough to be seen by the human eye. But if you stand back a bit... can you resolve detail of 1/100 inch a meter away? I certainly can't. So at a 'normal' viewing distance, appropriate for such a large print, the result would be fine - as long as the lens was good and sharp, and there isn't too much noise in the image..

On that basis you should be able to make nice A2 prints from a 7 - 8 Mp camera, a long as you don't plan to veiw them with a magnifying glass from six inches away. It is likely that the limiting factors will be lens quality and image noise..

Best wishesMike..

Comment #2

I think at that size, lens resolution, and camera movement will be as big a limiting factor as pixel count. Any blur or softness will seem magnified, and in many photos may overpower everything else.STOP Global Stasis! Change is good!.

Now that you've judged the quality of my typing, take a look at my photos..http://www.photo.net/photos/GlenBarrington..

Comment #3

The danger is that someone will get too close and see offensive jaggies which look terrible. People find fuzziness much less offensive..

The solution therefore is to up-size (resample) the image to about 200 pixels per inch on the print so jaggies can't be seen. Here is an image detail (a clown's nose) for example:.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

I think the up-sized image looks a lot better even though there's no more information. The right hand image's pixels are 1/2 the width and height of those on the left. That factor of 2 makes a huge difference in acceptability..

Dave..

Comment #4

The solution therefore is to up-size (resample) the image to about200 pixels per inch on the print so jaggies can't be seen. Here is animage detail (a clown's nose) for example:.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

I think the up-sized image looks a lot better even though there's nomore information. The right hand image's pixels are 1/2 the width andheight of those on the left. That factor of 2 makes a huge differencein acceptability..

Dave.

Yes it does, doesn't it... do you just do this in Photoshop, or is there a better way?Best wishesMike..

Comment #5

I think I used ImageJ. Most editing packages have such a function; use bicubic or some other interpolating re-sizing algorithm. I doubt it matters much which you use...

Comment #6

It looks like Picasa's Create/Poster menu option uses a suitable resizing function..

Dave..

Comment #7

Thank you very much for all your very very valuable comments...

Comment #8

Mike703 wrote:.

Do you just do this in Photoshop, or is.

Upsampling works pretty well in Photoshop - remember to use 'Bicubic smooth' as this does the best job of avoiding jaggies. After upsampling, sharpening will often bring some life back into the image by crisping up edges and giving an illusion of better detail..

If you are using a more basic image editor and you find that the jaggies are enlarged along with the image, try 'stair interpolation' which is upsampling by a small amount (say 10%) many times over until you reach the size you need...

Comment #9

Marbetu wrote:.

The thing I cannot find out on the reviews however, is, if 7 or 8pixels will give me enough quality (photos taken in optimumconditions with highest resolution and size settings) to be able toprint a poster in A2 size..

It depends on the image. If it is something that will be viewed as a whole from a comfortable viewing distance (think of a portrait, for example) then yes, 8MP will be enough. Basically the resolution you need for A4 printing at 300 dpi (i.e. approximately 3500x2500 pixels or 8.75 MP) is enough for printing at any size, because as the size increases so too does the viewing distance. The viewer's ability to discern detail remains the same..

However, some large images beg to be viewed closer and really do need more detail. Expansive landscapes often tend to do this which is why cameras like the 21 MP EOS 1Ds MkIII are in demand, and it is also why medium format film was always regarded as the minimum standard for serious landscape work..

Another type of shot which needs all the MP you can muster is the large group shot. People will be drawn closer to see the faces...

Comment #10

Marbetu wrote:.

Hello,.

I need to buy a camera, compact, around 200 Euro (200 USD /130GBPapprox I think). I could go to 250 Euro..

After reading many many reviews I'm attracted to the most recentcanon, nikon or lumix in that price range. Brands are in order ofpreference. They are all similar and all around 7 or 8 megapixels..

The thing I cannot find out on the reviews however, is, if 7 or 8pixels will give me enough quality (photos taken in optimumconditions with highest resolution and size settings) to be able toprint a poster in A2 size. Has anyone done this successfully??.

That's because it's not just a megapixel issue. How large your sensor is determines enlargement as well. How much detail there is in the image determines some of the limitations as well. How you enlarge also is a factor (pro shops with good RIPs can do wonders.) What's the viewing distance, what impact does the subject have... There are a host of things that determine how large an image will go, many of them image-specific, some of them audience-specific, and some of them camera-specific..

But depending on what you're going to shoot, how often and where you might be better-served renting a larger camera for the day and shooting what you want, or hiring a semi-pro who's work you like..

Paul.

Http://PaulDRobertson.imagekind.com..

Comment #11

Hi,.

Why not just download a picture from each camera and print it? That way you'll know for sure and can experiment with the software, printers etc that you have..

Chop a picture into quarters and print one on A4 and you've the equivalent of the whole picture on A2 but not so dear. And some printers (Epson) will take a picture and print it as a 4 or 9 sheet poster, with trim marks etc and re-sampling. It's an easy way to find out..

Regards, David.

PS Like many others I've done 32" x 24" from 5 megapixels and no problems, except finding the wall space.....

Comment #12

Here are some 8Mp photos from a Fujifilm F45fd you can examine -.

Http://fujif45fd.needsabeach.com/.

Kelly Cook..

Comment #13

What's A2? If I want to frame an A2 print, what size frame do I ask for?SP..

Comment #14

Http://www.facemediagroup.co.uk/?page=paper.sizes.

A good resourceSTOP Global Stasis! Change is good!.

Now that you've judged the quality of my typing, take a look at my photos..http://www.photo.net/photos/GlenBarrington..

Comment #15

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