How large can I print this?

[Moz]

Hi,

I have this picture that my Dad took years ago at Maranello's it was the Ferrari mechanical shop in 1975 and was the latest and best workshop in it's day, it's now the parts department.
My Dad would like a print of it as big as possible to go up in a new workshop.

Heres the EXIF data:

File name: 1975 Maranello workshops 5x4.JPG
File size: 80520 bytes (640x448, 2.2bpp, 11x)
EXIF Summary:

Camera-Specific Properties:

Camera Software: Adobe Photoshop CS2 Macintosh

Image-Specific Properties:

Image Orientation: Top, Left-Hand
Horizontal Resolution: 150 dpi
Vertical Resolution: 150 dpi
Image Created: 2008:10:20 18:07:45
Color Space Information: Uncalibrated
Image Width: 640
Image Height: 448

Other Properties:

Resolution Unit: i
Exif IFD Pointer: 164
Compression Scheme: JPEG Compression (Thumbnail)
Horizontal Resolution: 72 dpi
Vertical Resolution: 72 dpi
Resolution Unit: i
Offset to JPEG SOI: 300
Bytes of JPEG Data: 7712

What size would still retain a reasonable quality?

-Thanks for any help, Moz

 

[petemc]

The EXIF data is only for the scanned image which is only 640x480. Its tiny. Not large enough for 6x4'' print. Also, the EXIF on a scanned image is pretty useless info. I'm assuming you meant the original scan?

 

[Moz]

Oh yeh I forgot that it would of been scanned lol. Hmm Ill have to find out if he still has the print.

 

[Chappers]

If it's from a print then you might find the size limiting, as the resolution of photographic paper is fairly low ( It's not designed to be enlarged). However I suggest you scan it to produce say an 8 x 10 or 8 x 12 print and have a look at the resultant scan. If it looks OK then try going larger. If it looks poor then rescan to say 5 x 7 or similar. I suspect that 8 x 10 is probably the largest it would go , provided you don't look too closley