Request for information regarding special jpg image freeware / software

[John2005]

Hello everyone,

Can anyone please tell me if there is a freeware or demo program that
will increase the size of a jpg file without loss of image quality ? Is
there a way to increase image size and actually improve image quality ?

Perhaps I should convert the jpg to another format, and then try to
improve the quality of the image in a different format.

I would appreciate any feedback and/or advice.

Thanks
John

 

[jmatt]

These may help.

The Rasterbator
http://homokaasu.org/rasterbator/

http://www.ukoln.ac.uk/qa-focus/documents/briefings/briefing-28/html/

 

[John2005]

Thanks, I will give those links a try.

John

 

[Al Klein]

Can anyone please tell me if there is a freeware or demo program that
will increase the size of a jpg file without loss of image quality ?

Since the concept is impossible (there's no way to add non-existent
data to a file), the simple answer is "no".

Is there a way to increase image size and actually improve image quality ?

Not without adding the missing pixels from another, higher density,
picture.

You can change image size (downward as much as you want, upward a
little) with no *apparent* loss of image wuality, but you can't take a
50k .jpg and produce a 16 foot X 20 foot blowup that you can look at
from a short distance. (There's a maximum "subtended angle" [or
minimum distance] at which the picture elements start being visible -
you can't increase that.) Regardless of the size of the file, the
actual resolution can't be increased without adding picture elements.

 

[John Fitzsimons]

Hello everyone,

Can anyone please tell me if there is a freeware or demo program that
will increase the size of a jpg file without loss of image quality ? Is
there a way to increase image size and actually improve image quality ?

Perhaps I should convert the jpg to another format, and then try to
improve the quality of the image in a different format.

I would appreciate any feedback and/or advice.

It seems like you might want a freeware program that works like a
number of payware programs. SmartScale, Genuine Fractals etc. I
doubt that anything in freeware like them exists. There is however
free information on some of the issues you ask about, upsampling
etc at ;

http://graphicssoft.about.com/cs/resolution/gr/smartscale.htm

and other pages on that site. There are also a number of freeware
graphics programs listed there for downloading.

Regards, John.