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Re: [Inkscape-user] CMYK-safe color maps.
by gespertino＠...155... 05 Oct '11

05 Oct '11

> Imagemagick will convert a bitmap file from RGB to CMYK color space. So > will Scribus (with the help of an icc profile of course.) So I can > reverse the process and take the CMYK factors, key them into a color > mapping part of Scribus or Gimp, and jot down the RGB equivalent. The > resulting palette will be an RGB palette that is within the CMYK gamut. > > I just want to avoid all that labor. You'll want to avoid more than just the labor. Depending on which color profiles and rendering intents you use for converting RGB to CMYK and back. the loss of precision could be huge. Doing that you'll loose even in-gamut colors, since the conversion isn't bidirectional and all the color values are likely to be affected. My suggestion is to stay away of conversions, and only use gamut warnings to know which colors are printable and which aren't, so you can create a color map containing untouched RGB values that are printable in the specified target CMYK space. Doing two conversions you'll get a map of clipped or shifted values that have nothing to do with your original map. And the plan is to keep only the printable colors out of an existing color map, right? Gez. p.s.: Damn you, digest mode.

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Re: [Inkscape-user] Inkscape-user Digest, Vol 65, Issue 5
by gespertino＠...155... 05 Oct '11

05 Oct '11

> Imagemagick will convert a bitmap file from RGB to CMYK color space. So > will Scribus (with the help of an icc profile of course.) So I can > reverse the process and take the CMYK factors, key them into a color > mapping part of Scribus or Gimp, and jot down the RGB equivalent. The > resulting palette will be an RGB palette that is within the CMYK gamut. > > I just want to avoid all that labor. You'll want to avoid more than just the labor. Depending on which color profiles and rendering intents you use for converting RGB to CMYK and back. the loss of precision could be huge. Doing that you'll loose even in-gamut colors, since the conversion isn't bidirectional and all the color values are likely to be affected. My suggestion is to stay away of conversions, and only use gamut warnings to know which colors are printable and which aren't, so you can create a color map containing untouched RGB values that are printable in the specified target CMYK space. Doing two conversions you'll get a map of clipped or shifted values that have nothing to do with your original map. And the plan is to keep only the printable colors out of an existing color map, right?

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CMYK-safe color maps.
by john Culleton 05 Oct '11

05 Oct '11

In Inkscape one can arrive at CMYK-equivalent colors but only if one of the four CMYK factors is zero. Is there any of the standard Inkscape palettes that contains only colors that are convertible to CMYK without significant color shift? I can build my own but this will be extremely tedious. -- John Culleton Wexford Press "Create Book Covers with Scribus" http://www.booklocker.com/books/4055.html

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interpolation issue in Inkscape
by Florian Berger 03 Oct '11

03 Oct '11

Hi Inkscape community, I have an issue with unwanted / inferior looking interpolation in scaled Inkscape PNG exports. In the case at hand I have a pixel art image that has been converted to SVG using 40px x 40px vector squares for each pixel (whether or not Inkscape is the right tool for playing with pixel art is *not* the question here ;-) ). When such an image is scaled down a little and exported as PNG, it shows some poor interpolation artefacts. These artefacts are less obvious or not present in the actual Inkscape display, but very visible after export. Here is an illustriation of the problem: http://img594.imageshack.us/img594/769/inkscapeinterpolation.png (Please view at original size first to prevent additional interpolation.) Please note that some of these interpolations do not seem to make sense, e.g. using bright grey in the brown / dark red hair of the character. I am very aware that Inkscape may not be the weapon of choice for this kind of operation. Still, my questions: - Is there any way to prevent Inkscape from interpolation / anti-aliasing upon exporting such an image? - If this is an interpolation issue: why does Inkscape use such inappropriate colors? - Shall I file a bug? :) Any hint will be appreciated. Thanks, Florian

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Linux laptop/tablet PC for running Inkscape
by Philip Durbin 03 Oct '11

03 Oct '11

Hello! I'm interested in using Inkscape with a stylus on a touch screen and I'm heavily influenced and inspired by articles I've read about Máirín Duffy's use of a Thinkpad x61 to create illustrations for Red Hat: http://blog.linuxgrrl.com/2009/11/08/fedora-12-rocks-on-tablets/ http://mairin.duffy.usesthis.com/ I'm not sure what I would do with Inkscape exactly, maybe make a webcomic as I hinted about here: http://www.webcomicalliance.com/helpful-hints/mac-vs-pc-the-webcomics-editi… . For now, I just want to doodle a bit. Anyway, following Máirín's lead, I guess I'm thinking about buying a Thinkpad X Series Convertible Tablet. As of this writing the model that's available is the X220, but I'm not sure how well it works with Linux and Inkscape. Lenovo doesn't ship the device with Linux pre-installed: http://www.lenovo.com/products/us/laptop/thinkpad/xtablet-series/index.html I'm open to other hardware suggestions. On the market right now there's an HP EliteBook 2760p Tablet PC and a Dell Latitude XT3 Tablet PC as well. Basicially, I'm looking for something that will run Linux and Inkscape and let me draw on the screen itself rather than using a Cintiq. Is this a common hardware setup for Inkscape users? Can anyone recommend what device I should buy? I've been using Linux on the desktop for five years (usually something Red Hat-based) but never on a laptop. Thanks! Phil

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Inkscape on VALO-CD
by Tomi Toivio 01 Oct '11

01 Oct '11

Hello, I would like to ask for you feedback on Inkscape included on VALO-CD. VALO-CD is a Finnish collection of Open Source software and this is the first international version in English. Do you think that the description and screenshots of Inkscape are OK: http://www.valo-cd.org/free_inkscape You can also edit the description and screenshots in the VALO-CD wiki: http://www.valo-cd.org/wiki/Inkscape Feedback would be greatly appreciated! -- Best Regards Tomi Toivio Open Source Coordinator http://fi.flossmanuals.net/ tomi@...2893... +358445488856

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Re: [Inkscape-user] CMYK-safe color maps.
by gespertino＠...155... 30 Sep '11

30 Sep '11

I know this isn't a very scientific method, but still :-) I'd import the color map to inkscape or GIMP and use the gamut warning to "mask" out of gamut colors. then capture the "masked" palette, then re-create the palette using the captured values. CMYK-Safe colors depend on the output CMYK profile, so it's probably impossible to have a generic "safe" palette without using a specific profile as starting point. I'm pretty sure this isn't the best way to do it (there has to be a programatic way to do it using RGB and CMYK profiles to compile a palette, but I don't know how to do it). IIrc the program Swatchbooker allows to choose profiles to "convert" palettes, but I could never make it work. hth, Gez

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Master pages.
by john Culleton 29 Sep '11

29 Sep '11

After I create a multiple page document how do I create and/or get to the master page so I can insert the page numbering? -- John Culleton Wexford Press "Create Book Covers with Scribus" http://www.booklocker.com/books/4055.html

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shaded hatching
by Tom Sparks 16 Sep '11

16 Sep '11

I have read Drawing a smiley face, part 3 [1] How do I do shaded hatching like in the image at wikipedia.org[2] ? [1] http://wiki.evilmadscience.com/Drawing_a_smiley_face,_part_3 [2] http://en.wikipedia.org/wiki/Hatching -- tom_a_sparks "It's a nerdy thing I like to do" Please use ISO approved file formats excluding Office Open XML - http://www.gnu.org/philosophy/no-word-attachments.html 3 x (x)Ubuntu 10.04, Amiga A1200 WB 3.1, UAE AF 2006 WB 3.X, Sam440 AOS 4.1.2 Wanted: RiscOS system, GEOS system (C64/C128), Atari ST, Apple Macintosh (68k/PPC only)

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batch mode / command line mode
by Tom Sparks 15 Sep '11

15 Sep '11

dose inkscape have a batch/command line mode? what I want to do is: start a new A4 document import a SVG file rotate the object resize the object to fit on A4 page with 2 centimeter boarder save a new SVG file and save a hpgl file -- tom_a_sparks "It's a nerdy thing I like to do" Please use ISO approved file formats excluding Office Open XML - http://www.gnu.org/philosophy/no-word-attachments.html 3 x (x)Ubuntu 10.04, Amiga A1200 WB 3.1, UAE AF 2006 WB 3.X, Sam440 AOS 4.1.2 Roland DXY-1300 pen plotter, Cuttok DC330 cutter/pen plotter Wanted: RiscOS system, GEOS system (C64/C128), Atari ST, Apple Macintosh (68k/PPC only)

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