If sharpness is not the main criteria, how big can you go?

Both pics have about 1 MB

It really depends on the sensor.

I took a picture on a 2Mb Canon digital camera 8 years ago and blew it up to A0 with no pixellation whatsoever. I was quite shocked.

Chicog, those were the days, when pixel and sensors still had a reasonable dimension. Anything over 6million was considered overkill ( David Pogue, NY Times= 6mm is enough, more degrades only the quality)

A good article in helping explain about pixels and dpi - dpiphoto

A Megapixel calculator that converts from total pixels (5 Mpixel in the OPs case) to width x height. Megapixel Calculator

300 dpi is considered high print quality but many variables such as paper and ink bleed that will allow for example 200 dpi to look fine.

For example from the calculator for 5 Mpixel: 5Mpixel = 2584w x 1936h = 92.2cm x 68.3cm at 72dpi (screen view) or 43.8cm x 32.8cm at 200dpi (photo print) and 21.9cm x 16.4cm at 300 dpi (hi-res print). Assuming a 4:3 aspect ratio.

//edit - other sites - http://www.photo.co.nz/faq/resolution.htm

http://www.kenrockwell.com/tech/mpmyth.htm

http://photo-editing-software-review.toptenreviews.com/image-resolution.html

Most helpful. And how much can be added nowadays via manipulation with photoshop and the like?

Which program would be your choice? (Hopefully an easy one, not too demanding or , alternatively which photo service gives you good results, in BKK or Chiang Mai?

Most helpful. And how much can be added nowadays via manipulation with photoshop and the like?

Which program would be your choice? (Hopefully an easy one, not too demanding or , alternatively which photo service gives you good results, in BKK or Chiang Mai?

What size do you want the final print, that will help me see what it will look like using 100% cropping factor. The top left photo (very nice BTW) will probably work well blown up as it is a very even distribution of shades and pixelation will be less. You don't want to sharpen the image as that will just amplify any pixel or artifacts. Also, not clear on manipulation you wish to do? I use Photoshop for all my primary work but Gimp is free and quite powerful.

Thank you Tywais for your input, I was traveling, hence the late response and no time to look into your links. But I discovered today a very exiting story on digitalpreview.com , dealing just with this very subject. Star Rush, @starrush360, is Seattle-based a photographer, writer, and educator his entire web site was shot with Iphones, wonderful pictures , relatively large prints possible, most enlightening article written by Star himself, his whole web site is a trove.

http://connect.dprev...graphy#comments

Star is also a founding member of http://www.mobilephotogroup.com/

Here a wonderful catalog with Iphone photos, runs as slideshow, pic starting around pg 30

http://eyephoneography.com/catalogs-and-limited-edition-prints-available-for-purchase/

I don't know much about it but I can tell you that before today's great mobile cameras, I had a Nokia that had a 3.2 MP camera. I have had photo shops print out 8" X 10" pictures suitable for framing and they were quite good. Certainly much better than I expected. I have found the photo shops do a better quality picture. I have printed some with a Canon printer that looked good but after a few years they have faded badly.