G7 GRACoL Separation Questions
I am setting up a job which will be output by a a G7-certified printer, separating to a standard GRACoL2006_Coated1v2.icc profile. I have some general questions relating to some areas that might require some special treatment: ------ 1) Some pages use a rich black background behind knocked out text. I have two questions related to this: a) What is the ideal build for a neutral, rich black? My files currently have it defined as 30c,27m,0y,100k, but I can adjust as needed. b) Should knockout text over that background have a .25pt 100k outside stroke to act as a keep-away (as they currently do), or is that better handled by in-RIP trapping? ------ 2) Some images are gray (neutral or toned). Should they also be separated using the GRACoL profile, or am I better using a very high GCR separation. I have used high-GCR separations in the past for that sort of image, but perhaps the G7 process makes that an unnecessary or less desirable choice. And if I am best off with a high-GCR separation, what might be best settings for me to generate one from ProfileMaker? ------ 3) My employer (not me) will be going to Hong Kong for the press check. He has often been accustomed to calling for inking adjustments as he sees initial signature output, but my understanding is that too much of this is not desirable with a gray-balanced G7 approach. Any insights? -- ___________________________________________________ RICK GORDON EMERALD VALLEY GRAPHICS AND CONSULTING ___________________________________________________ WWW: http://www.shelterpub.com
Hi Rick, Great set of questions. My take on "rich black background" recipes is not to reinvent the wheel, sort of speak. My *personal* preferences goes to throw an "HC" build or an "HR" build underneath the black. I'm not going to comment further because "rich blacking" is akin to a religion in graphic arts. So, depending who I speak to, I get all sides of the argument. It works for me and it is logical. As for text, it's hard to beat the smarts of Adobe in-Rip trapping built into most workflows nowadays. I'd leave it. For the "gray" images, I would use a high-GCR profile. No question. Nothing to do with G7. Printing is printing. I'll leave others to suggest "best" settings for ProfileMakerPro. Have you considered making your own GRACoL2006_C1 profile, in ProfileMakerPro? Last but not least, what should you do with your employer the moment he's on press in Hong Kong? To this I reply, "dam if you do, dam if you don't". Meaning, don't let your current intuitive understanding keep you from pushing the envelope in the direction that you would like to: there are so many things that go on in a press room that you will hit all your aims or you will not hit all your aims, but you'll never know what is it that was responsible for your success or failure. Printing is highly complex. I say, adopt a policy and go for it. You won't go wrong. Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Rick Gordon Sent: August-03-11 6:48 PM To: ColorSync List Subject: G7 GRACoL Separation Questions I am setting up a job which will be output by a a G7-certified printer, separating to a standard GRACoL2006_Coated1v2.icc profile. I have some general questions relating to some areas that might require some special treatment: ------ 1) Some pages use a rich black background behind knocked out text. I have two questions related to this: a) What is the ideal build for a neutral, rich black? My files currently have it defined as 30c,27m,0y,100k, but I can adjust as needed. b) Should knockout text over that background have a .25pt 100k outside stroke to act as a keep-away (as they currently do), or is that better handled by in-RIP trapping? ------ 2) Some images are gray (neutral or toned). Should they also be separated using the GRACoL profile, or am I better using a very high GCR separation. I have used high-GCR separations in the past for that sort of image, but perhaps the G7 process makes that an unnecessary or less desirable choice. And if I am best off with a high-GCR separation, what might be best settings for me to generate one from ProfileMaker? ------ 3) My employer (not me) will be going to Hong Kong for the press check. He has often been accustomed to calling for inking adjustments as he sees initial signature output, but my understanding is that too much of this is not desirable with a gray-balanced G7 approach. Any insights? -- ___________________________________________________ RICK GORDON EMERALD VALLEY GRAPHICS AND CONSULTING ___________________________________________________ WWW: http://www.shelterpub.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/colorsync-users/graxx%40videotron.ca This email sent to graxx@videotron.ca
Hi, Roger, Could you clarify what you mean by HC or HR builds? I'm not finding a reference for that terminology. I've downloaded the data set GRACoL2006_Coated1.txt, which I will use to generate a profile at 320 TIL. I am assuming that I will want to use essentially maximum GCR with black going from 0 to 100, so that as much data as possible is held in the black channel with the other channels used to add density and toning as necessary. Seem reasonable? Thanks for your input. Rick Gordon ------------------ On 8/3/11 at 8:00 PM -0400, Roger Breton wrote in a message entitled "Re: G7 GRACoL Separation Questions":
Hi Rick,
Great set of questions.
My take on "rich black background" recipes is not to reinvent the wheel, sort of speak. My *personal* preferences goes to throw an "HC" build or an "HR" build underneath the black. I'm not going to comment further because "rich blacking" is akin to a religion in graphic arts. So, depending who I speak to, I get all sides of the argument. It works for me and it is logical.
As for text, it's hard to beat the smarts of Adobe in-Rip trapping built into most workflows nowadays. I'd leave it.
For the "gray" images, I would use a high-GCR profile. No question. Nothing to do with G7. Printing is printing. I'll leave others to suggest "best" settings for ProfileMakerPro.
Have you considered making your own GRACoL2006_C1 profile, in ProfileMakerPro?
Last but not least, what should you do with your employer the moment he's on press in Hong Kong? To this I reply, "dam if you do, dam if you don't". Meaning, don't let your current intuitive understanding keep you from pushing the envelope in the direction that you would like to: there are so many things that go on in a press room that you will hit all your aims or you will not hit all your aims, but you'll never know what is it that was responsible for your success or failure. Printing is highly complex. I say, adopt a policy and go for it. You won't go wrong.
Roger
-- ___________________________________________________ RICK GORDON EMERALD VALLEY GRAPHICS AND CONSULTING ___________________________________________________ WWW: http://www.shelterpub.com
Sure. HC = "Highlight Contrast" = 25c 19m 19y and HR = "Hightlight Range" = 50c 40m 40y. Yes, your black separation logic is flawless. You're welcome. Roger -----Original Message----- From: colorsync-users-bounces+graxx=videotron.ca@lists.apple.com [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Rick Gordon Sent: August-03-11 8:21 PM To: 'ColorSync List' Subject: RE: G7 GRACoL Separation Questions Hi, Roger, Could you clarify what you mean by HC or HR builds? I'm not finding a reference for that terminology. I've downloaded the data set GRACoL2006_Coated1.txt, which I will use to generate a profile at 320 TIL. I am assuming that I will want to use essentially maximum GCR with black going from 0 to 100, so that as much data as possible is held in the black channel with the other channels used to add density and toning as necessary. Seem reasonable? Thanks for your input. Rick Gordon
participants (2)
-
Rick Gordon
-
Roger Breton