On 17/05/2020 12:22, alan_m wrote:
On 17/05/2020 09:12, Andy Bennet wrote:
On 17/05/2020 09:06, Brian Gaff (Sofa) wrote:
I remember back many moons ago those lovely junia set Fractal
patterns of
ever repeatingÂ* shapes at smaller sizes used to fascinate me. and I
wondered
if anyone had ever made wallpaper using them.
There are many companies that will print wall sized murals from your
own photos.
For instance:-
https://www.betterwalls.co.uk/en/pg/...llpaper-185087
So you could manufacture your own particular choice and email it to them.
How large does the source file have to be for an acceptable image blown
up to the size of a wall?Â* They appear to accept files up to 500Mbytes
but no consumer camera/phone gets anywhere near this size of output, and
few will output a raw image rather than a compressed jpeg image.
Used correctly there is nothing wrong with a JPEG file - even if you use
it incorrectly to store line art rather than a photograph. Using the
right settings is crucial and for some content other formats are
preferable. There are unfortunately broken implementations about
I've seen commercial produced wallpaper murals where the resolution is
so poor that they look out of focus unless standing at least 10 foot away.
You have to decide on a dots per inch and a viewing distance.
Even large classic grand master paintings have an optimal viewing
distance to appreciate them at their best. Too close and you see too
much of the mechanics of the brush strokes or dots.
600dpi static image at normal reading distance of 20cm will be good
enough for most normally sighted people. 300dpi might do at a pinch.
60dpi will probably be good enough for wallpaper viewed from 2m away to
still look tack sharp. Print a test piece to decide what you can live with.
An original historic postcard contact print from a full size negative
can stand being enlarged to about A2 before it becomes a problem.
If you wanted to do it then one of the less common formats that allows a
65536 false colour palette would be ideal for Mandelbrot or Julia sets.
Always check that your print service can handle the format though.
I had a set of true monochrome JPEG images come back in psychedelic
colours once on a Fuji Crystal archive digital print service. The unit
substituted its own default false colour mapping on the images.
--
Regards,
Martin Brown