I have a 6mb Canon EOS Digital Rebel.  I�ve taken a RAW picture which shows to be 36mb.  I�ve then converted it to a high quality (12) JPEG image with dimensions of 3400x5100 and 5.61mb.  My concern is that I am trying to submit to a website which demands �48mb minimum uncompressed file size�.  They later state to interpolate images to a minimum of 48mb using professional upsizing software.  I have Photoshop CS, does this mean I need to take the JPEG image and increase the dimensions until the file goes from 5.61mb to >48mb or am I looking at this completely wrong ?

Thank you for your help !!!

 

Steve,
   Thanks for your reply below.  Is there a limit to how much one can increase the size w/o losing noticeable quality ?  I�m sure there is quality loss with any increase but I�m just looking for some general guidelines, i.e. 5%, 10% or whatever�


Thanks.

 

I don't use PS, but I believe it will tell you the uncompressed file size even of a JPEG file (PSP does, so PS must do too). 

Regarding upsizing, I remember seeing a recommendation of a PS plugin at some stock site.  Some time ago I tested a trial version of ClearerZoom and got very good results in most cases and I was upsizing 100% from 640x480, but it all depends on the original image (it has to be good!).  I have upsized images in 10% to fit minimum requirements in some sites, using PSP's interpolation.  I doubt however that 100% upsizing will be approved in most sites.  To begin with, some flaws become much more noticeable (purple fringe, for instance).  In some cases it may work, but not in most cases at the top sites.

This one, for instance, was succesfully upsized in 100% from a 900x600 scanned image:
http://www.shutterpoint.com/Photos-ViewPhoto.cfm?id=272507
while this one, also upsized in 100% but from a 640x480 digital image, shows noticeable flaws at 100% view (check with image zoom tool)
http://www.shutterpoint.com/Photos-ViewPhoto.cfm?id=269504
In both I used ClearerZoom.

Regards,
Adelaide