2008/6/7 Olivier BERTEN <<a href="mailto:olivier.berten@gmail.com">olivier.berten@gmail.com</a>>:<br> <div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> <div dir="ltr" bgcolor="#ffffff" text="#000000"> <p style="margin-bottom: 0cm; margin-top: 0pt;">This is a question for the printing professionals in the list.</p></div></blockquote><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr" bgcolor="#ffffff" text="#000000"> <p style="margin-bottom: 0cm; margin-top: 0pt;"><br> </p> <p style="margin-bottom: 0cm; margin-top: 0pt;">What is a tint of ABC (technically speaking)? </p></div></blockquote><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr" bgcolor="#ffffff" text="#000000"> <p style="margin-bottom: 0cm; margin-top: 0pt;">- ink ABC printed at x%</p></div></blockquote><div><br> Right. What happens when you ask the application to produce such a tint is it sends to the imagesetter or platesetter the instruction to produce a screen at the given percentage. On press, this will result in printed dots, large or small, to produce a darker or a lighter tint. The ink itself is alsways printed at 100% on each dot and the mix between the unprinted portion and the printed portion on the paper fools the human eyes and makes it believe there is a tint of that ink.<br> <br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr" bgcolor="#ffffff" text="#000000"> <p style="margin-bottom: 0cm; margin-top: 0pt;">- x% ink ABC melt with (100-x)% of white ink<br> </p> <p style="margin-bottom: 0cm; margin-top: 0pt;">- x% ink ABC melt with (100-x)% of transparent varnish<br> </p> <p style="margin-bottom: 0cm; margin-top: 0pt;">- ???</p> <p style="margin-bottom: 0cm; margin-top: 0pt;"><br> </p> Is it used in printing or only in paint?</div></blockquote><div><br> If one is going to use white ink into an ink mix, this applies to spot colors such as Pantone. It's basically to obtain a specific color for a specific plate. <br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr" bgcolor="#ffffff" text="#000000"><br> <br> Subsidiary question: How do current graphic softwares deal with white ink? Which ones allow you to define a paper color/texture other than white and are able to simulate white ink (vs CMYK "white")?</div></blockquote><div><br> If one wants to print white over a dark colored paper (for the sake of this explanation), then we need a specific plate for this color, as for any other color. On the press, the pressman will introduce white ink and this ink will be applied to the paper in the exact same way any other ink would. This also applies to spot varnish (the term spot here means like for any other ink that you determine precisely where varnish will be applied, as opposed to "press varnish" that will cover indistinctively all the surface of the sheet).<br> <br> To produce such a plate out of the application, you need to create a specific color for white and this has to be at 100% if you want a "solid" white. In this case, of course, CMYK all set to 0% will not result in a white plate. It will result in no information on each plate.<br> <br> Now, to simulate this on screen and on proofs, you'll have to create a color for your paper. The white elements of your layout will be set to white (regular white, no info on plates, all set to 0%). But beware. This will be ok for screen and printed proofs on a white paper — where your actual colored paper will be simulated by the paper color you've created — and where the white ink will be simulated by the whiteness of the paper (that 0% color). On press it's going to be a total different thing and you'll need 1) NOT to print that simulation of the color of the paper (not output that plate, actually, because there is no need for it) and 2) create that specific white at 100% — the lightest possible color set as a spot color (no CMYK here) can be used for this as I doubt one can set an opaque white at 100% in a DTP app because white requires always 0%... Remember that the name on the plate have no effect on the ink choosen for print. It's only an indication for the pressman. The real ink is the one that is put on press.<br> <br>HTH<br><br>Louis<br><br><br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr" bgcolor="#ffffff" text="#000000"><br> </div> <br>_______________________________________________<br> CREATE mailing list<br> <a href="mailto:CREATE@lists.freedesktop.org">CREATE@lists.freedesktop.org</a><br> <a href="http://lists.freedesktop.org/mailman/listinfo/create" target="_blank">http://lists.freedesktop.org/mailman/listinfo/create</a><br> <br></blockquote></div>