Le 10/07/2020 à 12:00, Bert Driehuis a écrit :
If your printer is an offset outfit, chances are they are using
Fogra39.
Yes they are !
I could talk to a pre-press person and learned that the ICC is Fogra39.
He said that "Offset paper increases red chanel by 2 or 3%".
That could contribute to darkening effect.
You probably don't have a cheap way to do a trial print, do you ?
Printer proposes Cromalin or Chrome-alun.
It's 200km away... So maybe i'll go there and also have a splash in the closeby
mediterranee.
Don't know an answer to your question, but using ImgeMagick to fix up
jpg colors will significantly reduce image qsuchuality,
Ah :-/
What sort of quality is reduced with ImageMagick ?
Even with that quality loss, maybe lessening that bad "dark area flattening and
darkening" effect
would be worth some imagemagick quality loss ?
I could apply it selectively.
> so figuring out the ICC profile is your best bet.
Until now i used "ISO Coated V2 300%" becauses this was the ICC for the
previous printer.
Now i'll switch to FOGRA.
But even before, I didnt achieve perfect photo rendering except on specific
photos.
JL
On Fri, Jul 10, 2020 at 10:09 AM JLuc <j...@no-log.org> wrote:
Le 10/07/2020 à 09:56, JLuc a écrit :
My new printer didnt provide an ICC profile file when asked (said it's not
required afaicr).
Printed photos are not too bad but are quite often too contrasted
and dark areas appear flattened and shifted to the very dark.
Sometimes also the light areas appear also flattened and shifted to the very
light
but most issues are with darker areas.
I've asked some advices to the printer but i'm afraid i wont get usefull answer.
(Do you sometime get any usefull answers from your printers ?)
As for now i'm thinking of bash-editing all images so as to curve the dark
colors lighter.
How could i best bash achieve this on linux ?
After trying a few parameters it looks like this command could do :
convert cheval.jpg -level -0%,100%,1.5 cheval-level0,100,1.5.jpg
My other questions remain open.
What should i care do to avoid worsening the print ?
JL
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