Advice needed over resolution for poster images

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stephenweaver

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I have just completed a photoshoot for a local hair salon and they would like me to submit images for website use and for enlargement on an A1 size poster (i.e 23" x 33").
Could anyone advise re. the optimum image sizes, both for website use and for the posters from the j-pegs I have (originating in a 12 mp Nikon D700 and mostly shot at 50mm)?
 
To print A1 at 300 dpi would be 9,930 x 7,020. Your D700 will produce images of 4256 x 2832 so you're not going to be able to do that. I would just crop to the correct aspect ratio and submit the image to the printers at the largest size you can. Some printers may specify image dimensions though, so check before you print.

As for the website, only they will be able to tell you what size they want. It depends on the use and their preference. 600, 800 or 1024 on the long side would be common sizes for web use, but unless you're going to charge based on the image size, you could just give them full size images and let them worry about resizing
 
Aspect Ratio is the shape of the image.

A 10 x 8 picture has an aspect ratio of 5:4 (5 units on the long side, 4 on the short), a 6 x 4 is 3:2

A 20 x 16 is also 5:4, and a 24 x 16 is 3:2
You find the largest number which will divide into both dimensions (largest common denominator), and then do the division. For a 10 x 8 the largest common denominator is 2, which divides into 10 five times and into eight four times, giving 5 x 4.
 
Thanks, Stratman. I'm mostly using uncropped images from the FX full frame (i.e 3:2).
I'm guessing i will have to gauge the resolution in Photoshop?
 
I dont tend to crop much in Photoshop (usually use lightroom) but when I do I just put the aspect ratio into the width/height boxes of the crop tool. I don't bother with units (pixels/cm/inch) or specifying dpi.

This crops to the correct aspect ratio for the final print. Then I resize the image if needed to the printers' specifications. You can work out your resolution by dividing the number of pixels by print size in inches.

This is how I do it, but someone with more experience of preparing images for print in Photoshop may be able to give more advice on their workflow
 
When your talking poster are you talking about printed ad poster or a photo print, they are very different things.

In print you should be looking at 133 lpi, or larger, you can actually res up a 2m image to suite if you have to and know how to do it properly.

So don't worry that much about the res, just about the quality.
 
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