QTR-Quadtone RIP

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) ?
>