Few questions about CMS

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Harkonnen2

Few questions about CMS

Postby Harkonnen2 » Thu Mar 27, 2008 9:30 am

I've read the release notes and still I don't know how to:

1. Use the CMS tab under the fill and stroke dialog (do I need some special ICC profiles to use it?)
2. Save files like PDF or AI with CMYK colors instead of RGB (is it possible?)

I work with graphics for offset printing so using CMYK or Pantone colors would be something great to have in inkscape (bye, bye Corel Draw :P). I use ECI rgb v2 profile as a monitor profile and ECI ISO Coated v2 (300%) profile for output device, both with relative colorimetric rendering intent.

I would be grateful for any help. Thanks in advance.

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microUgly
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Re: Few questions about CMS

Postby microUgly » Thu Mar 27, 2008 11:27 am

Unfortunately, Colour Management is only supported on Linux and MacOS currently. It's a recognised bug that I believe they are working on.

I believe when it works Inkscape will list the ICC profiles installed on Windows.

Harkonnen2

Re: Few questions about CMS

Postby Harkonnen2 » Thu Mar 27, 2008 4:47 pm

Well I was talking about Linux there. Back home i'm working on Arch Linux, and even if Color Management work (I think) properly (I can see the changes when I turn softproofing on), the CMS tab on fill/stroke dialog lets me only to change the opacity of color. And I presume it should give me ability to edit CMYK colors. The dropdown list on the CMS tab has only 1 entry: "none", and the "fix" button remains dead. Is it a bug, or just this feature is not yet ready for production?

Am I thinking correctly that saving svg with cmyk will work only when I use the CMS tab to edit the fill/stroke color?

Third thing is a bug I think: when I use the CMYK tab for fill/stroke with softproofing and marking out of gamut colors on, I find that it marks perfectly safe colors as out of gamut (like CMYK 100/100/0/0 which is just blue many times used in offset). Does this feature also interacts properly only with "CMS colors"? Profiles are set like in my previous post.

Thanks for help.

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microUgly
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Re: Few questions about CMS

Postby microUgly » Fri Mar 28, 2008 8:49 am

Some of these more technical questions you'll probably have to raise with the developers. As far as I've been able to find, how to use the CMS function hasn't been documented.

But it has been confirmed to work on Linux. The reason you are getting "none" is probably because you don't have any ICC profiles for Inkscape to find.

I checked the mailing list and found a post stating that Inkscape will search the following folders for ICC profiles.

Code: Select all

~/.color/icc
/usr/local/share/color/icc
/usr/share/color/icc

If you don't get a satisfactory answer on this forum I suggest you try the mailing list as the people who developed this feature participate there.

Harkonnen2

Re: Few questions about CMS

Postby Harkonnen2 » Fri Mar 28, 2008 9:02 am

As I wrote earlier:
Harkonnen2 wrote: I use ECI rgb v2 profile as a monitor profile and ECI ISO Coated v2 (300%) profile for output device, both with relative colorimetric rendering intent.


Profiles are seen, softproofing works, I just don't know how to save CMYK works and why the CMS tab gives me nothing.

Thanks for your help. I'll try to get to the developers.

samigina
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Re: Few questions about CMS

Postby samigina » Wed May 28, 2008 12:19 pm

Hi, i have the same problem with CMYK support, the CMS tab dont works; and if i draw a square and i fill it with Magenta 100%, when i export the file to pdf and open it in Illustrator the color value has changed. I have the ICC profiles installed in Ubuntu 8

Really hope CMYK support on Inkscape, i keep waiting....while, i keep working with Illustrator and window$....sad, sad thing.

Excuses for my english im a spanish speaker.

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BobSongs
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Re: Few questions about CMS

Postby BobSongs » Thu Jul 17, 2008 8:31 am

I guess it's just one of the casualties of Inkscape's increasing power and abilities. Rather than just a tool to draw a pretty woman or a desktop icon one can now so some serious work with it. I'm currently using it for a restaurant menu/brochure (I'll add a link to what it looks like).

See: thing is, I like Inkscape's interface for working. It's focus is graphics. Setting up rectangles, circles, text... it's what it does well. Scribus is very slow at responding. Without standardized templates I just don't like working with Scribus' graphic side.

Let me contact the developers and see what they offer for a solution to rendering Inkscape SVGs into CMYK PNG files. I suppose exporting it to PNG and then using GIMP to do the 2nd half of the job is acceptable for GNU/Linux users. It would be nice to have the support right in Inkscape. Ah well. So demanding.

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BobSongs
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Re: Few questions about CMS

Postby BobSongs » Thu Jul 17, 2008 9:07 am

Here's a link to the Color Management portion of the Inkscape wiki.

Color management

Calibrated SVG color including CMYK

Inkscape now supports color-managed color definitions that use a colorspace other than sRGB (for example Adobe RGB, or calibrated CMYK colors). In the SVG file, this is done using the optional "icc-color(...)" paint components as described in section 11.2 "Specifying paint" of the SVG 1.1 specification *. A fallback sRGB value will be used, for non color-managed workflows. This allows for the use of calibrated color spaces, including using CMYK values that are preserved across applications.

The new CMS color selector tab allows these colors to be edited.

Display adjustment

In Inkscape Preferences, Color Management tab, there's are new options for enabling display adjustment; you can select any calibration profile (an ICC file) suitable for your display. Options for rendering intent can also be chosen.

Per-window adjustment

Display adjustment is enabled and disabled per each editing window. This allows for simultaneous viewing of adjusted and unadjusted views of a single document by using multiple windows. There is a toggle at the bottom-right corner of the scrollbars that allows for turning on and off display adjustment. It also will be disabled to provide visible feedback when no profile is set to be available for adjustment.

XICC Support

On X11-based systems (i.e. Unix and Mac OSX), use of [ICC Profiles In X Specification] (or XICC) can be enabled. Support for version 0.2 of this specification has been implemented. Enabling this option by choosing to retrieve profiles from the display will switch Inkscape to using profiles attached to screens at runtime. These allow display adjustment to be changed on the fly, and to be set and cleared per-monitor. This is especially helpful with more than a single monitor.

Other Open Source software such as GIMP support XICC. This allows all aware applications to be adjusted by setting a profile only once.

Multi-monitor aware

When XICC support is enabled, windows will adjust to the proper profile as they are moved across monitors. Also, as the windows are moved onto monitors with no profile attached, the adjustment toggle will become disabled. When the windows are moved onto screens that do have profiles, the toggle will become enabled.

Soft Proofing

In Inkscape Preferences, Color Management tab, there's a new option for enabling output device preview; you can select any calibration profile (an ICC file) suitable for your output device. Options for rendering intent can also be chosen, along with out of gamut warnings.

OS support

Сolor management is supported in Linux and Mac OS X only at this time.

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microUgly
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Re: Few questions about CMS

Postby microUgly » Thu Jul 17, 2008 2:21 pm

BobSongs wrote:Let me contact the developers and see what they offer for a solution to rendering Inkscape SVGs into CMYK PNG files.

PNG supports RBG only (no CMYK). So you'll need to find another path to preserve CMYK colours.

Ixohoxi
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Re: Few questions about CMS

Postby Ixohoxi » Mon Sep 15, 2008 12:57 am

microUgly wrote:The reason you are getting "none" is probably because you don't have any ICC profiles for Inkscape to find.


Harkonnen2 wrote:As I wrote earlier:
Harkonnen2 wrote: I use ECI rgb v2 profile as a monitor profile and ECI ISO Coated v2 (300%) profile for output device, both with relative colorimetric rendering intent.


Profiles are seen, softproofing works, I just don't know how to save CMYK works and why the CMS tab gives me nothing.

Thanks for your help. I'll try to get to the developers.

It is troubling to me when people don't *READ* what was written in a post. Makes no sense, really.
(Or if they don't understand it when they *should* be able to - not the case here though, I assume.)

The whole attention to detail thing, it's just way out of style. :?

Guess I'll boot into Mac mode to play with CMS & CMYK in Inkscape.


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