QTR-Quadtone RIP

Paolo

What inks are you using here? The ink limits vary widely and this is not 
like any partition I have seen before. If I was to guess at the cause of 
the problem I would say that, upto the 98% spot, the magenta position 
ink in combination with the black ink is overinking the paper reducing 
dmax. Because you have no overlap the black is on its own at the 100% 
step and you're dmax is therefore restored (with an overlap the magenta 
would still fire at the 100% point). You could test this by adding an 
overlap of say 8. If I am right this will reduce the reading at 100% 
more in line with that at 98%. However this test is only confirming the 
problem - overinking - which still needs to be resolved.

(I've also not seen the use of commas as decimal places in qidf files 
before but I guess you would be having greater problems if these were 
not allowed).

regards
Howard


paolovertullo wrote:
> here it's my .qidf :
> 
> PRINTER=QuadR260-MIS
> CURVE_NAME=MK-EPSON-ARCHIVAL-MATTE-6ink-140408
> GRAPH_CURVE=YES
> N_OF_INKS=6
> DEFAULT_INK_LIMIT=
> BOOST_K=
> LIMIT_K=30
> LIMIT_C=25
> LIMIT_M=75
> LIMIT_Y=5
> LIMIT_LC=12
> LIMIT_LM=25
> N_OF_GRAY_PARTS=6
> GRAY_INK_1=K
> GRAY_VAL_1=100
> GRAY_INK_2=M
> GRAY_VAL_2=38,33
> GRAY_INK_3=C
> GRAY_VAL_3=29
> GRAY_INK_4=LM
> GRAY_VAL_4=16,66
> GRAY_INK_5=LC
> GRAY_VAL_5=11
> GRAY_INK_6=Y
> GRAY_VAL_6=5,66
> GRAY_HIGHLIGHT=10
> GRAY_SHADOW=10
> GRAY_OVERLAP=
> 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
> 
> thanks for the help Howard
> 
> Paolo
> 
> 
> --- In QuadtoneRIP@yahoogroups.com, Howard Shaw <glassman@...> wrote:
>>
>> paolovertullo wrote:
>>  > i didn't specifyed any black boost value.
>>  > is it supposed to be valorized ? in this case what is a good starting
>>  > point ?
>>  >
>> Paolo
>> 
>> It can't be black boost causing it then. Another variable that might 
>> affect this is overlap. Perhaps it would be helpful if you could paste 
>> your whole .qidf into a message.
>> 
>> By the way, I'm assuming that the 100% patch is a lot darker than the 
>> 99% patch.
>> 
>> regards
>> Howard
>>
> 
> 
> 
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