Re: CTP - reduced dot
Re: CTP - reduced dot
- Subject: Re: CTP - reduced dot
- From: Bret Hesler <email@hidden>
- Date: Wed, 08 Mar 2006 13:14:13 -0500
- Thread-topic: CTP - reduced dot
All 40" Heidelbergs. There can be some differences between units and between
presses, usually pretty minor. It is hard to quantify with the variety of
papers and spot colors that we print.
Bret
On 3/8/06 12:35 PM, "Jon Crook" <email@hidden> wrote:
> That is pretty good! What kind of presses are you running? Are your readings
> similar from unit to unit? We noticed quite a bit of difference from going
> from 175lpi to 250lpi although this was easy to compensate for.
>
>
> On 3/8/06 11:03 AM, "Bret Hesler" <email@hidden> wrote:
>
>> Yes. We did one of the runs for the GRACoL committee at 175LS with linear
>> plates, and had around 1% move at the midtone to get the GRACoL tone curve.
>> We recently put in a new press and ran the test at 200LS and got almost
>> exactly the same results. Our inks matched the solid LAB values from ISO
>> 12647-2.
>>
>> Bret Hesler
>> L.P. Thebault Company
>>
>>
>> On 3/8/06 10:59 AM, "Jon Crook" <email@hidden> wrote:
>>
>>> Are you able to achieve gray balance and still get GRACoL 7 lab values for
>>> CMYK while getting a plate curve that is close to linear?
>>>
>>>
>>> On 3/8/06 9:20 AM, "Bret Hesler" <email@hidden> wrote:
>>>
>>>> Our inks are relatively low in Tack. It reduces the problems with picking,
>>>> and allows us to get relatively close to legacy midtone gain values with
>>>> plates that are close to linear.
>>>>
>>>> Bret Hesler
>>>> L.P. Thebault Company
>>>>
>>>>
>>>> On 3/8/06 9:11 AM, "Jon Crook" <email@hidden> wrote:
>>>>
>>>>> We are also running to GRACoL 7 but what you run to depends on what your
>>>>> intentions are. If you want to match legacy work then you would want to
>>>>> achieve the lab values, densities, and the appropriate dot gain as to what
>>>>> you where running before you went CTP. I have found that GRACol 7 is much
>>>>> easier to maintain than our legacy specs so any reprints that come through
>>>>> get a new proof for approval. In my experience, linear plates seem to look
>>>>> pretty flat on press
>>>>>
>>>>>
>>>>> On 3/8/06 7:16 AM, "Bret Hesler" <email@hidden> wrote:
>>>>>
>>>>>> We run curved plates to match the GRACoL 7 tone curve. When we switched
>>>>>> to
>>>>>> digital halftone proofing and CTP, our legacy standard was Analog
>>>>>> waterproof. Three years ago, we lowered the dot gain targets to match the
>>>>>> GRACoL 6 spec, around 20%. Now with the GRACoL 7 targets, our plates are
>>>>>> near linear, and dot gains are in the mid to high teens.
>>>>>>
>>>>
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