-------- Original-Nachricht -------- > Datum: Mon, 17 Dec 2007 09:30:22 +0100 > Von: Thomas Lunzer <[EMAIL PROTECTED]>
> But is there a way to bypass this for black text > and line art? I looked through the code of the firmware > of our printer, but could not find anything regarding > this behaviour. I suspect the lookup tables of the > original crd’s were edited by hand to print black rgb > text as pure 100%K. I am not really familiar with the > internals of colour transformations, so does any one > have a hint for me where to start out? For http://sourceforge.net/projects/m2300w I had to solve the same problem. I wanted to offer an "auto" print mode, which eventually prints pure text pages with black toner only (which is also much faster on these revolver laser printers). The "icclink" utility of Argyll CMS offers an option -f to render neutral colors with black ink only. So for achieving the goal I selected an intermediate RGB colorspace (I did choose sRGB) and created a device link from this RGB color space to the printer's CMYK space with Argyll's "icclink -f...". Then I recombinded the RGB profile with the device link with the LCMS utility icclink in order to obtain an output profile which can be fed into icc2ps. This is surely not optimal, as the overall gamut is also bounded to the gamut or the intermediate RGB color space, and because the device link is resampled again, which indeed won't improve the acuracy, but it seems to be sufficient for consumer applications, where people typically print sRGB data anyway. (It is possible that I also had to tweak the resulting CRD a little bit manually to workaround numerical inaccuracies - I don't remember). Regards, Gerhard -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
