Joakim,
For understanding:
- ECIrgb has some advantages in highlights and midtones (barely visible
for normal printing processes)
- ECIrgb has some trouble with shaddows and darker colors (3/4) which
are visible, but often
superseeded by wrong separation settings on CMYK printers. They will
be visible when using
direct RGB printing processes like those being used for diapositives.
- ECIrgb, like other RGBs with gamma, have trouble to reproduce neutral
grey, as it is allways interpolated
LStar-RGB has the same colorspace but tries to correct the problems
stated above
- neutral grey is defined in the profile. There is only little
interpolation involved
- It has more details in dark tones and shaddows with a barely visible
expense in the highlights and midtones
(RGB 127:127:127 is 50% in LStar-RGB but 60% in ECIrgb)
- It's internal structures are closer to the way how color management
software does it's magical math.
This way there is less guessing and more prediction.
For practical work:
- Both LStar-RGB and ECIrgb deliver better performance than AdobeRGB
and sRGB when printing in Europe.
- You will notice differences in output only when the whole color
workflow is using professional color management
at a high quality level. The differences will be superceeded by other
printing issues when color management
and printing is not handled professionally
The issues you experienced before might be due to a wrong setup of your
printer (like sending LStar-RGB,
but using ECIrgb in the printer...)
Hope this helps
Karsten
P.S.: Markus, thank you for your help to solve this
Am 31.05.2005 um 11:54 schrieb Joakim Eskildsen:
Karsten,
Thank you for your answer,
I understand that the colorspace betvien Lstar-RGB and ECI-RGB are the
same and that Lstar-RGB has a LAB linar kind of gamma and ECI-RGB has
a gamma of 1.8, but what I don´t understand is what is meen in
practis. I have made some pictures with Lstar-RGB and printed them out
on and Ink-jet printer and it somehow looks like they pictures are
less colorfull than the monitor. When I make the pictures in ECI-RGB
the prints comes out more true to the sceen.
My cersern is to find the best possoble RGB colorspace for 16 bit
editing, (color negatives scanned with imacon 949) the pictures are to
go to a exhibition and shall be made on epson new ink-jet printer 9800
aswell as they shall be printed in a book using ISO coted profile.
Few month ago I used adobe 1998 colorspace for everything but I
understad that this ECI-RGB is better designed for the CMYK convertion
and for ink-jet colores and decided to use ECI-RGB as my only RGB
color space but now I am a bit unsure.
I can understand from Guenter Bestmann writing that ECI-RGB is the
best RGB space conserning printing on Ink-jet and for the CMYK wourld?
--------------
Joakim Eskildsen
Karlbergvägen 9
02400 Kyrkslätt
Finland
ciao.joakim(a)dnainternet.net
+358-9-2216 330 fax/ phone
+358 442871030 mobile phone