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Canon 40d how big?

20 Dec 2010 8:39PM
Hi everyone, I have been asked to provide some images at work but they need to be A1 size. This seems a little big to me but what I need to know is if the Canon eos 40d will produce good quality image at this size?
Many thanks

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MrGoatsmilk 9 1.5k England
20 Dec 2010 9:06PM
How close will people be when they view them, also what are the images?
20 Dec 2010 9:16PM
The images are to be donated to and displayed in a hospital stroke unit but if suitable would also be displayed in the main hospital. They require images of local landscapes, architecture and flowers.
MrGoatsmilk 9 1.5k England
20 Dec 2010 9:40PM
I've just been having a look around the forum as I know it has been asked and covered before. Hence the reason I asked how far away people will view them from, further away the more you can get away with.

Found these...


and here

a few more here


20 Dec 2010 9:41PM
That's great!
Thanks for your help.

JackAllTog Plus
9 5.0k 58 United Kingdom
21 Dec 2010 1:43PM
Its the detail that become an issue, as you have an image about 3888 x 2592 pixels, so as you stretch this accross an a1 sheet ( Size 84 x 60 cm), so each pixel starts to become distinct when viewed close enough.

Solutions to this can be simple structures where bold angle and lines make the interest in the picture rather than the fine detail which will look blurry and pixelated. In this way the image is naturally viewed from a distance.

Alternatively stitching together panoramics will give you more pixels to play with, a variation on this theme is more of a scrapbook approach with different views of related subjects all added to one image.
brian1208 Plus
14 11.4k 12 United Kingdom
21 Dec 2010 1:52PM
if you start with a well exposed and sharp image then you can easily print at up to 30"x20" with 40D files (I have images from my old 350D which print to this size for sale)

For the use you are talking about printing at 180 ppi
johnp 13 141 United Kingdom
4 Jan 2011 1:31PM
It really shouldn't be a problem, Keith. I've produced a number of display prints that sort of size, using Photoshop's Image Size to blow them up (using interpolation). Some were portraits with buildings in the background. All were shot on a 40D with the Canon 24-105mm f/4 L series lens. In fact it's your lens quality that could be the limiting factor.

I was taught that exhibition quality prints should be made at 300ppi. Last year I was running a Photoshop course for my local camera club and decided to make prints at 300ppi, 240ppi, 200ppi, 150ppi and 72ppi to illustrate that point. I chose a portrait in semi profile and picked a portion that included an eye, a cheek and a patch of brown hair with dark shadows in it. To be blunt, I reckon most of my portrait clients would have accepted the 72ppi print without complaint. If you looked closely at the prints (maybe 6-8 inches away) the eye did show faint stepping around the pupil because of the size of the pixels, but held a foot or so away the prints were indistinguishable. Suffice to say that when I took the prints in for the next lesson I took a loupe as well.

If you are still concerned, make a file the right size (aim for about 150ppi to 200ppi and use Image Size) then select a few 6"x8" patches and get them printed. Your test patches should come both from the centre and from edges in case your lens shows excessive edge fall-off. I didn't bother doing that, because I have confidence in the lens.

My prints were made by Loxley and drew many favourable comments.

4 Jan 2011 1:37PM
Many thanks for your reply John, you have been very re-assuring and I am grateful for your contribution.
johnp 13 141 United Kingdom
4 Jan 2011 1:40PM
My pleasure, Keith. Let us know how you get on!
PS Don't forget to view the test prints from a fair distance away to get an accurate idea of what normal viewers will see.

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