Re: Converting using Device Links
Re: Converting using Device Links
- Subject: Re: Converting using Device Links
- From: Joseph Yates <email@hidden>
- Date: Wed, 23 Aug 2006 12:01:41 -1000
- Thread-topic: Converting using Device Links
>> Need to use just that AppleScript right now to convert a whole lot of images
>> using a DeviceLink profile I created in PMP 5 (CMYK->CMYK).
>>
>> Questions:
>>
>> Can you set up this script to batch convert a whole folder of images?
>> (Source profiles in all images are the same)
I guess I found the answer to my own question - in that one can attach an
Applescript to a folder and all files in that folder will be acted upon by
the script
>> How does one know that the conversion worked?
> on 8/22/06 8:19 PM, Marco Ugolini at email@hidden wrote:
>
> Open one of the converted images, assign the same profile that you
> designated as the target in the device link, and if the image looks right on
> your profiled monitor (the same appearance as that of the image before the
> conversion), then it's quite likely that it worked.
So nothing other than a visual analysis? - Question: would one use the PS
View / Proof Setup of the Working (CMYK) of the Source colorspace or the
destination colorspace of the Device Link to compare the 2 images?
>
> Yes, it is a pain that the "Convert File Using Device Link" script does not
> embed the correct profile, but, come to think of it, how would it know what
> the right profile is for that particular device link conversion?
I thought the Applescript knew that info from the target space of my device
link. In your advice above you are saying to assign the same profile I
designated as the target in the device link - so why doesn't the Applescript
do that automatically?
>
> There may be ways to "enhance" the script so that it has a step in which you
> can designate the profile to be assigned to the converted file, but I am
> afraid I cannot advise you on how to do that, since my AppleScript skills
> are not exactly stellar.
Nor mine - but I am sure there must be a way to include or extend the
scripts capabilities - guess it's time to delve into AppleScripting
>
>> I just tried to convert 1 image and when I go to open in Photoshop I get the
>> window that indicates the image has no embedded profile. Do I also have to
>> do a script to embed (destination of device link) device profile?
>> Again a way to batch embed a whole folder of images?
Again I could attach an Applescript to a folder to achieve this.
>> Should the Black channel in a Device Link CMYK to CMYK conversion maintain
>> the same percentage from source to destination?
>
> I doubt that that would be the case, since different profiles define
> different behaviors (including inks and dot gain, er..., TVI, as they call
> it these days). The trick would be to make the conversion (which possibly
> changes the values in the black channel), but still keep pure the blacks
> that were pure in the source file, even though their numerical values may
> change slightly.
Got it. I am assuming PMP5 does this with it's Clean Blacks option?
>
>> I test converted a Kodak Grayscale Q13 using the Device Link profile and the
>> darkest patch shows a drop from 83% black (source) to 79% (destination).
>
> Yes, but that might be wholly appropriate for the printing environment
> described in the destination profile, due to any of a number of reasons (ink
> composition, densities, TVI, etc.).
>
I should of mentioned that I was converting from my offset printers Creo
Spectrum proofer to the same device but with newer settings - so CMYK to
CMYK of the same device. We had noticed that the blacks were looking lighter
in our converted files and the resulting hardcopy proofs - the Grayscale
test conversion did show me that the black plate was being reduced from 83K
to 79K - not a huge drop but still a drop in the black - where I thought
that a device link would "preserve" the black channel.
Joseph Yates
Maui, Hawaii
>
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