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FreeFlow User

Color conversion to grayscale

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I'm looking for solution how to configure FFcore to convert color files to grayscale for better output results on Nuvera printers.

For testing I use testfile which contain color information inside:

Original_file.jpg

At the beginning I use 'Manage Color' component and select 'All Objects Using ICC Profiles' conversion methodologyFFcore-Manage_Color.jpg

but this method doesn't work - testfile still contains color:

After_Manage_Color.jpg

The questions is: what I should select in this component to convert all color information to grayscale?

 

I use another method - I use "Preflight" component and Callas PDFtoolbox 7.x conversion profile (*.kfpx), the results are great!

After_Preflight_v7.jpg 

But when I use the same profile but from newest version of PDFtoolbox (v8) some error occured during converion - Internal error in library.

After_Preflight_v8.jpg

Conslusion: PDFtoolbox 8.x profiles are not support, yet!

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Member
Member

Re: Color conversion to grayscale

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I would just add a preflight porifle to convert B/W from my workflow as the first step. Also in the image quality tab from nuvera, select only 600 dpi as oppose to 1200 dpi as your image quality.

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Re: Color conversion to grayscale

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The screenshot in your post has Wide Gamut RGB as the Destination Profile.

 

The Manage Color component will convert the file to that color space. Are those the settings that you used?

If so, can you try selecting a grayscale profile?

The icon next to the profile name indicates whether the profile is grayscale, RGB or CMYK.

 

Screen Shot 2015-06-29 at 4.58.17 PM.png

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FreeFlow User

Re: Color conversion to grayscale

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it helps, many thanks for hint.

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FreeFlow User

Re: Color conversion to grayscale

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Previous 'Manage Color' component used for color to grayscale conversion works for previous jobs but lately our customer meet with conversion problem on one of the job (attached). In this case some objects are black only (K 100%) and after this conversion it is converted into 95% Black. How to manage it and don't convert object if they are in Black only?

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Valued Member
Valued Member

Re: Color conversion to grayscale

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I did a test, and Pitstop converted from color to grayscale better then Core does. That being said, could you tell me the best settings in Manage Color for grayscale conversion. Do I need Pitstop server to export my color to grayscale profile? I have a color to grayscale action list in Pitstop, but I cannot import that, so I am wondering how to go about bringing in a good color to grayscale profile.

 

Erick

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Re: Color conversion to grayscale

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I just converted this using pdfToolbox (the Manage Color component uses pdfToolbox). The output looks correct (see attached).

I am enclosing the preflight profile that I used.

 

If the output from Manage Color does not match this output then there's a problem with how that component works. Can you submit this to the hotline?

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Valued Member
Valued Member

Re: Color conversion to grayscale

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Thank you!

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