Re: [Gimp-user] New User Need Help Enlarging/Enhancing Image

[Ofnuts <ofnuts gmx com>]

On 08/13/18 20:31, Matthew Woehlke via gimp-user-list wrote:
> On 2018-08-13 13:09, Partha Bagchi via gimp-user-list wrote:
> > The image is 2048x1536 (3.1 MP). Best you can hope for is an 8 by 10.
> > That's inches. If you are willing to sacrifice quality further you can try
> > printing in 150dpi which would give you 14 by 10.
> I'm not sure I'd go even that big. The original was twice that
> resolution and had a lot less JPEG artifacting.
>
> Actually... you might be going about this all wrong. If you really want
> to use this to produce a very large physical print, I would consider
> embracing that the original image is smudgy by upsampling it (maybe to
> 7200x3600 if not 14400x7200 after cropping it to 2:1) and then applying
> some of gimp's artistic filters to achieve a look that is more
> "painting" than "photograph". This will make some of the lack of
> quality in the original irrelevant. At least give it a try digitally; if
> you don't like the result, all you've lost is some time.
>
> Also, make sure you save the result at least as a JPEG with 98% to 100%
> quality, if not PNG.
I second the idea to hide the defects with some heavy "artistic" 
filtering, but 98% quality? Totally unnecessary. On rathre expensive 
Canon DSLRs, the "fine" JPEG quality is 97%. Going above that add a lot 
to file size without adding much in actual quality. After a heavy 
filter, 90% would be enough.