[NTG-context] Color Separation with external figures and spot colors
Hi All, Does anyone know if/how I can take a grayscale JPG external figure and assign it to a spot colour channel. The Color Separation manual gives the following example: \externalfigure[graphic][split=c] for assigning such an image to the Cyan channel but I want to say something like: \definecolor [Spot1] [c=1,m=.05,y=0,k=.47,e=PANTONE 308 CV] \definecolor [Spot2] [c=.69,m=.07,y=0,k=0,e=PANTONE 298 CV] . . \externalfigure[graphic][split=Spot1] Is this possible? Thanks in advance for any help anyone can offer :) Mark Pearson. ** This email and any files transmitted with it are confidential, and may be subject to legal privilege, and are intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error or think you may have done so, you may not peruse, use, disseminate, distribute or copy this message. Please notify the sender immediately and delete the original e-mail from your system. Computer viruses can be transmitted by e-mail. Recipients should check this e-mail for the presence of viruses. The Capita Group and its subsidiaries accept no liability for any damage caused by any virus transmitted by this e-mail. *** ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Color separation
Duncan Hothersall wrote: 2. is there a way I can check that it is working properly without sending it to the printer each time? Acrobat has an overprint preview since v5; AFAIK Reader got it in v7. Yes... but it doesn't show up any problem. (Well, it just displays the same thing with overprint preview as without.) *But* in Acrobat Professional 7, doing a preflight check for CMYK+Spot output, it complains about overprint = off on all the text on tints. So I guess there is a problem in some way? This is why I am confused. hm, i don't have the full acrobat 7 (only 6) Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
[NTG-context] Color separation
Sorry for all the messages; I am exploring things I don't really understand. I hope someone can enlighten me! With the following colour set-up: \setupcolors[rgb=no,cmyk=yes,spot=yes,state=start] \definecolor[PantoneTwoNineFour][c=1,m=.56,y=0,k=.18] \definecolor[IFSbluetabletint][PantoneTwoNineFour][p=.15] and then using this tint as a textbackground and also as a backgroundcolor in frames, I am getting complaints from my printers that black overprinted on the tint is 'knocking out' the tint and leaving white on the separated plate. I have read and re-read the useful msplit.pdf which suggests that the implicit criterium=all will negate this effect, but perhaps I have misunderstood? Two questions: 1. how can I stop black overprinting from knocking out the tint, and 2. is there a way I can check that it is working properly without sending it to the printer each time? Thanks as ever for any help. Do I need to post example output? Duncan ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Color separation
Am 17.03.2005 um 15:35 schrieb Duncan Hothersall: 2. is there a way I can check that it is working properly without sending it to the printer each time? Acrobat has an overprint preview since v5; AFAIK Reader got it in v7. Grüßlis vom Hraban! --- http://www.fiee.net/texnique/ http://contextgarden.net ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Color separation
Duncan Hothersall wrote: Sorry for all the messages; I am exploring things I don't really understand. I hope someone can enlighten me! With the following colour set-up: \setupcolors[rgb=no,cmyk=yes,spot=yes,state=start] \definecolor[PantoneTwoNineFour][c=1,m=.56,y=0,k=.18] \definecolor[IFSbluetabletint][PantoneTwoNineFour][p=.15] and then using this tint as a textbackground and also as a backgroundcolor in frames, I am getting complaints from my printers that black overprinted on the tint is 'knocking out' the tint and leaving white on the separated plate. I have read and re-read the useful msplit.pdf which suggests that the implicit criterium=all will negate this effect, but perhaps I have misunderstood? Two questions: 1. how can I stop black overprinting from knocking out the tint, and 2. is there a way I can check that it is working properly without sending it to the printer each time? Thanks as ever for any help. Do I need to post example output? whow, a demanding color user -) see mag-0006.pdf for more info on properties \setupcolors[state=start,textcolor=cyan,overprint=yes] \setupbackgrounds[page][background=color,backgroundcolor=magenta] \starttext \input tufte \startproperty[knockout]\input tufte\stopproperty \startproperty[overprint]\input tufte\stopproperty \input tufte \stoptext - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Color separation
2. is there a way I can check that it is working properly without sending it to the printer each time? Acrobat has an overprint preview since v5; AFAIK Reader got it in v7. Yes... but it doesn't show up any problem. (Well, it just displays the same thing with overprint preview as without.) *But* in Acrobat Professional 7, doing a preflight check for CMYK+Spot output, it complains about overprint = off on all the text on tints. So I guess there is a problem in some way? This is why I am confused. Knowing what ConTeXt incantations *should* make it work would be a start, and then I can tell the printer that they have to fix it! :-) Duncan ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
Re: [NTG-context] Color separation
whow, a demanding color user -) ... overprint=yes ... Aaaah. Thanks you so very much Hans. Of course, as ever, the answer is a single setting which solves all my problems. Off to add this gold to the wiki... Duncan ___ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context
