QTR-Quadtone RIP

Hi Howard,
thank you for all your help , now i'll start with linearisation.
Unfortunately i haven't any densitometer so i have to use a scanned file. 
If i understand well i'll print the 21step.tif then once scanned i'll
use photoshop in lab mode with eye drop (3x3) to read the L values and
to insert them in the linearisation matrix on qtr.

i hope it will work.....

bye
Paolo




--- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>
> Hi Paolo
> 
> Glad to hear you're close to getting good results. The qidf file you 
> have copied below does not include any linearisation figures - have you 
> carried out this part of the process?
> 
> When it comes to screen to print matching there are of course other 
> issues not specifically related to qtr which are important such as 
> screen calibration & color management. Personally I would not adjust
the 
> gamma in qtr or start applying special curves in photoshop before you 
> have addressed these issues. I am not an expert but there are others on 
> the board who may be able to help with that subject.
> 
> regards
> Howard
> 
> paolovertullo wrote:
> > Hi Howard,
> > yesterday night i used all your advices and finally i create a curve
> > that prints a 21step.psd without a step (may be just a little step but
> > nothing compere to the other curve). happy of the result i printed a
> > foto and i realized that was darker then what i was seeing on my
> > monitor. I modifyed gamma from 1 to 1,5 but the result was that the
> > picture was lighter but the step appeared again !!! 
> > 
> > The curve that works well but print darker is here :
> > 
> > N_OF_INKS=6
> > DEFAULT_INK_LIMIT=30
> > BOOST_K=30
> > LIMIT_K=30
> > LIMIT_C=15
> > LIMIT_M=15
> > LIMIT_Y=13,33
> > LIMIT_LC=13,33
> > LIMIT_LM=13,33
> > N_OF_GRAY_PARTS=3
> > GRAY_INK_1=K
> > GRAY_VAL_1=100
> > GRAY_INK_2=C
> > GRAY_VAL_2=33,33
> > GRAY_INK_3=LC
> > GRAY_VAL_3=16,66
> > GRAY_HIGHLIGHT=10
> > GRAY_SHADOW=6
> > GRAY_OVERLAP=20
> > GRAY_GAMMA=1
> > GRAY_CURVE=
> > N_OF_TONER_PARTS=0
> > TONER_HIGHLIGHT=10
> > TONER_SHADOW=10
> > TONER_GAMMA=1
> > TONER_CURVE=
> > N_OF_TONER_2_PARTS=0
> > TONER_2_HIGHLIGHT=10
> > TONER_2_SHADOW=10
> > TONER_2_GAMMA=1
> > TONER_2_CURVE=
> > N_OF_UNUSED=0
> > COPY_CURVE_M=C
> > COPY_CURVE_Y=LC
> > COPY_CURVE_LM=LC
> > 
> > 
> > do you think i have to preprocess the photos with a brigthness layer
> > on photoshop ? or may be i am a problem with settings of my monitor
> > (lcd samsung) ?
> >
>