Image duotone (Project)

=early draft=

13:53 < SimAV> hello fschmid 13:54 < SimAV> #3743 is appointed to you? I have stumbled over this bug yesterday and somehow need to have a fix or workaround next week... 13:54 <@mrscribe> Colorize converts Spot colors to CMYK 13:55 < SimAV> "But 13:55 < SimAV> in general creating a doutone image with a spotcolour could be easily added, this 13:55 < SimAV> needs to disable the other colorfilters for this image. " 13:55 < SimAV> yes, that's what i have to do... 13:57 < SimAV> it hasn't to be perfect yet, I just have to get out PDFs with duotone (black and a HKS color) or grayscale images, no other types of images will be required... 14:00 < SimAV> I had already a look at scimage.cpp but as i don't know scribus internals i have no clue how to let colorize and duotone output non-CMYK/RGB colors 14:01 < SimAV> is there some documentation available on how sccolor is used for a color consisting of a spot color at 50%? 14:01 < SimAV> or just a spot color at 100%? 14:06 hmm, this is difficult as images are always represented as RGB or CMYK or Lab data in the pdf 14:06 there is no way to "colorize" a bitmap with a spotcolor in pdf 14:07 thats why the bug 3743 is still open 14:14 < SimAV> ok, but scribus is said to support duotone eps... 14:14 < SimAV> so a workaround would be to use a duotone eps if one can produce one? 15:23 SimAV: can you get duotone image saved as EPS file? I think it may best way to insert such image into PDF (by embedding EPS in PDF) and get it will works in print house 15:28 < SimAV> cezaryece, ah, one has to embed the EPS? 15:28 < SimAV> that might be why i can't find HKS in the exported eps/pdfs anymore :D 15:30 < SimAV> cezaryece, well, doesn't seem to work either? 15:30 < SimAV> Or is the EPS being compressed when it is embedded into the PDF? 15:30 SimAV: how do you check this so fast? 15:31 < SimAV> grepping for HKS in the pdf 15:31 < SimAV> this doesn't work of course if the eps is being compressed 15:31 SimAV: if set compression in PDF embedded will be compressed also 15:31 embedded EPS... 15:32 < SimAV> http://fpaste.org/nf6o/ 15:32 <@mrscribe> Title: Viewing Paste #77830 (at fpaste.org) 15:32 < SimAV> that's the beginning of the eps that has been used 15:33 ok, and now when you embed this EPS in PDF this postscript code should appear in PDF code, but it may be compressed 15:35 < SimAV> ok, grepping doesn't show the EPS code 15:35 < SimAV> even though i unchecked compress images 15:42 SimAV: now I am finish working day, tomorrow I can check this issue with duotones from CorelDRAW 15:42 < SimAV> ok... 15:43 < SimAV> tomorrow i will be on the train all afternoon long 15:43 < SimAV> but i might be back tomorrow in 3-4 hours 15:43 < a_l_e> SimAV: you may have to specify when your tomorrow starts :-) 15:43 lol 15:44 < SimAV> a_l_e, atm i have 15.44 15:44 < SimAV> but tomorrow at the same time i won't be here 15:44 < a_l_e> ok, we're all at CET, then :-) 15:44 < SimAV> but tomorrow 3-4 hours "after the same time" ;) 15:44 < SimAV> probably :) 15:44 ok, we have same time, so morning will be morning for us 15:45 < SimAV> when reading some scribus code i got the impression that it's mainly written by german spoken people ;) 15:46 < a_l_e> scribus has been started by a german speaking person! 15:46 < SimAV> or at least several variables I saw have german names... 15:46 < a_l_e> and most variables had german names... nowadays, there should only be few of them left 15:47 -!- mizmo [~duffy@fedora/mizmo] has joined #scribus 15:51 SimAV: what vector program you have? Illustrator, CorelDraw? 15:51 < SimAV> only FOSS software 15:52 and PhotoShop...;) 15:52 < SimAV> but i got a EPS that was created by Photoshop (CS5) 15:52 < SimAV> no, i don't 15:52 I see 15:53 < SimAV> but someone did me a favor and converted a testimage into a "duotone" 15:53 < SimAV> however, i have to do that for several images... 15:53 < SimAV> my first try was to use gimp, but there the plugins only simulate duotone and produce a RGB image 15:54 < SimAV> then i thought about writing a small programm producing a 2-layer Tiff 15:54 < SimAV> using libtiff 15:54 < SimAV> but then i found out that scribus has an image effect called Duplex/Duotone 15:54 < SimAV> that ought to do just what i want, however it works only in CMYK and RGB and not using spot colors 15:55 -!- pAt_ [~pat@pD9E0A821.dip.t-dialin.net] has quit [Quit: leaving] 15:55 < SimAV> they get converted to CMYK internally and the resulting image is a CMYK one 15:55 < a_l_e> ... which makes it almost useless... 15:55 < SimAV> absolutely 15:55 < SimAV> then someone told me yesterday, that scribus should have good support of duotone eps/psd 15:56 < SimAV> but until now all tries getting out a PDF that contains only black and my spot color failed 15:56 -!- Huhtiranta [~simo@dsl-lprbrasgw1-fe80dc00-50.dhcp.inet.fi] has joined #scribus 15:56 < SimAV> even when putting just one imageframe on a page 15:56 < SimAV> and importing the EPS that obviously consists just of black and spotcolor (checked with vim) 15:58 < a_l_e> somebody also told you that it may or may not work... you have to try :-) 15:58 -!- wolfspraul [~wolfsprau@mimi.q-ag.de] has quit [Quit: leaving] 15:58 < SimAV> now someone told me that PDF doesn't support spot colors in bitmaps which is the cause for               colorize not to work 15:58 < a_l_e> well, for the eps, you may have to check the experimental "eps embedding"... did you do it? 15:58 < SimAV> which i can believe, as photoshop refuses to export the duotone to tiff or similar 15:59 < SimAV> a_l_e, yes, i did, but still don't see the HKS in the PDF source code 16:00 < SimAV> and in the print preview the image is converted to CMYK 16:00 < a_l_e> the print preview goes through ghostscript... that does not count... 16:00 < a_l_e> pdf is native in scribus... 16:01 < a_l_e> you may try with another simpler eps and see how that one gets embedded... 16:02 for HKS text is in PDF created from Scribus with EPS embedded with duotone image 16:02 -!- cezaryece [~quassel@83.2.27.2] has quit [Remote host closed the connection] 16:02 < SimAV> http://fpaste.org/Qg1m/ 16:02 <@mrscribe> Title: Viewing Paste #77841 (at fpaste.org) 16:03 < SimAV> that's what i find in the PDF that contains just an image frame and the duotone EPS from PS 16:04 < SimAV> /DeviceCMYK sounds very bad, i guess it should be /DeviceN in order to have a real duotone 16:04 < a_l_e> i would first try with a "normal" small eps with just a vector line in it and see if you get the code from the eps in the pdf... 16:04 < a_l_e> and if it's there, i would check a very simple bitmap eps (no duotone or such)... 16:04 < a_l_e> no time to do it myself now, though... 16:05 -!- ludo21 [~lchevalie@lns-bzn-48f-62-147-222-239.adsl.proxad.net] has joined #scribus 16:05 < SimAV> ok... I'll try :) 16:06 < SimAV> ok, producing a EPS containing just a black and a HKS 15 rectangle works in so far as it               outputs something containing HKS 15 as %%DocumentCustomColors: 16:07 -!- pygmee [~pygmee|wo@vil35-2-82-227-205-248.fbx.proxad.net] has quit [Ping timeout: 264 seconds] 16:08 -!- ludo2 [~lchevalie@lns-bzn-48f-62-147-222-239.adsl.proxad.net] has quit [Ping timeout: 276 seconds] 16:10 < SimAV> ok, when using a 2 rectangle EPS (black + HKS) 16:10 < SimAV> (created by scribus) 16:11 < SimAV> then importing it in scribus again inside an image frame 16:11 < SimAV> saving the imageframe as EPS conserves the spot color 16:12 < SimAV> when saving the page containing the EPS as PDF without compression the EPS gets split up 16:13 < SimAV> but the PDF contains a line saying [ /Separation /HKS#2043#20K /DeviceCMYK 14 0 R] which                should be evidence enough to assume that everything worked as expected 16:13 < SimAV> well, this time i used HKS 43 instead of HKS 15, so that's no problem 16:16 < SimAV> but when using the EPS created by photoshop i can't find "HKS" anymore in the resulting PDF 16:27 < a_l_e> and you told scribus not to compress the bitmaps... 16:28 < SimAV> yes 16:28 < SimAV> ok, very interesting: when using "epstool --bitmap --device tiffsep foo.eps bar" the scribus 2-rectangle EPS gets correctly seperated, however the Photoshop EPS doesnt?! 16:35 < a_l_e> but the rectangles are vectors, aren't they? 16:38 < SimAV> yes 16:39 * SimAV wonders whether writing a program that writes millions of EPS rectangles to simulate pixels would be worth being written :D 16:39 < SimAV> I guess the resulting PDF will be rather huge and extremely slow to open/print ;) 16:40 < SimAV> s/writing//g 16:41 < SimAV> well, i doubt that InDesign would do that 16:43 < SimAV> PDF must somehow support duotone images, but how? 16:50 < SimAV> hm, ghostscript seems to support psd as output format with spot colors 16:51 < SimAV> so the question is, whether scribus supports duotone psds... :D 16:51 < SimAV> (and then produces PDFs containing the spot colors and not their cymk representations) 16:58 < a_l_e> SimAV: once you have all the information, the best thing is probably to post a summary to the               scribus-dev mailing list... 16:59 < SimAV> :D 16:59 < SimAV> well, it would be good to know whether scribus supports duotone PSDs ;) 17:00 < SimAV> .oO(posting that information to the scribus-dev mailinglist sounds like carrying coals to               Newcastle) 17:01 < a_l_e> the question is whether the people who can answer the question are reading your words now... 17:02 < SimAV> yes... 17:02 < a_l_e> probably yes... but, to be sure, you'd better do a post to the ml 17:02 < a_l_e> it's also a chance to summarize all the information which has been written in the last hour...