Illustrator CMYK test / help. 2020 Responses

Last post: 5 months ago | Thread started: May 16, 08, 9:25 a.m.

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• mybrokenshoe

  Hello Folks, just wondering whether any one could do a test for me in regards to Illustrator CS3?

  If I create a new document, in CMYK and the start to draw shapes,for example black on red, I get a weird jagged shape around the edge, sort of like a bitmap. It looks like this (zoomed in):

  

  However if i then change the set the Document Colour Mode to RGB it disappears.
  If it then switch back to CMYK it doesn't not return, until I start a new document...

  Is it possible for any one to test whether this happens on their CS3?

  Or Do i have some weird setting turned on?

  Any help would be much appreciated...

  thanks

  May 16, 08, 9:25 a.m. – Permalink

• detritus

  I suspect they're artefacts - do they show when you print, or do they just show on-screen (I'd be willing to bet the former)?

  I think they're caused by the faked transition between a non-screen black (ie. K) to a 'normal' colour.

  

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  Dog-earMay 16, 08, 9:27 a.m. – Permalink

• epete22

  the font looks corrupted

  

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  Dog-earMay 16, 08, 9:28 a.m. – Permalink

• detritus

  And the reason they don't show when you convert back from RGB is that the value of K has changed to a moderated RGB colour, which can translate back to CMYK.

  I think?

  

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  Dog-earMay 16, 08, 9:28 a.m. – Permalink

• mybrokenshoe

  Thanks folks,

  Hello detritus - I am not sure whether they how up in print, I have yet to send An illustrator file to print (is usually jpg's) and so am concerned about my work appearing in mag's with those artifacts.

  As to the font, I just made it so i think thats safe.

  

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  Dog-earMay 16, 08, 9:34 a.m. – Permalink

• mybrokenshoe

  Ahhh it does seem to only be when i select black from the colour box

  Will do some more investigating, Thanks for putting me on the right track detritus.

  • No problem.
    
    Assuming I'm not completely wrong, of course!– detritus

  

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  Dog-earMay 16, 08, 9:35 a.m. – Permalink

• detritus

  Can you not do a test print locally?

  I've seen these little buggers turn up in my CMYK documents beforehand, so *personally* I'd not be too concerned.. though I'd fish for some other, more competent, people's opinions first!

  

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  Dog-earMay 16, 08, 9:36 a.m. – Permalink

• dan5382

  When I've seen this problem, the artifacts generally show up on local printers (lasers, office jets, etc.) but if its a pro print job (press) than there should be no problem.

  

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  Dog-earMay 16, 08, 9:40 a.m. – Permalink

• horton

  doesn't make sense with black only, but is your pixel preview turned on.. ? under VIEW menu?

  also try screwing with the Anti Alias pref and appearance of black prefs.

  • Apperance on Black does not change it either.– mybrokenshoe

  

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  Dog-earMay 16, 08, 9:40 a.m. – Permalink

• mybrokenshoe

  "Can you not do a test print locally?"

  my printer is having trouble regonising cartridges so at the mo, sadly nope.

  "though I'd fish for some other, more competent, people's opinions first!" - Am going to post on the adobe site see what they say... and I post up anything interesting here.

  

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  Dog-earMay 16, 08, 9:42 a.m. – Permalink

• mybrokenshoe

  Nope pixel preview is off, Gets worse if it's on!

  Turning off Anti Alias gets rid of the issue, but then i have super jagged bits.

  

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  Dog-earMay 16, 08, 9:46 a.m. – Permalink

• horton

  ... and these are vector elements right? sounds like your illustrator may be fcked. have u tried a good old relaunch/restart?

  

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  Dog-earMay 16, 08, 9:48 a.m. – Permalink

• mybrokenshoe

  yep vector shapes. It's been doing it for a couple of day, or at least i have noticed it in the last couple of days. I usually would in Rgb copy to PS and convert to CMYK. Is only when i decided to work CMYK in Illustrator I noticed it.

  Just checked it out in CS1 and 2 and it is the same. (though CS1 less)

  

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  Dog-earMay 16, 08, 9:57 a.m. – Permalink

• Dancer

  Haven't read all but have you sorted it?

  I think I know why

  

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  Dog-earMay 16, 08, 10:02 a.m. – Permalink

• detritus

  I've just done a wee test on my CS3, and it does it there too. Really, don't fret - it's an artefact like I said.

  • i work in AI all day every day and never seen anything of the sort.. ?– horton

  

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  Dog-earMay 16, 08, 10:02 a.m. – Permalink

• Dancer

  Now I have read the posts I don't think I do know. I was going to say is have you accidently turned on your pixel preview (in the view menu)

  

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  Dog-earMay 16, 08, 10:05 a.m. – Permalink

• detritus

  Horton - Maybe it's a PC thing? You noted that BrokenShoe said the above image was 'Zoomed In'? Really, it's nigh on indiscernible in a practical sense. I'd guess it's due to Illy not bothering with any clever processing to accurately render a CMYK transition to Screen RGB, which if you think about it logically, it would have to do which makes sense, as calculating a very heavy document's full aliasing range would get very processor intensive).

  I first noticed this a few years back and fretted about it then - but really, it's not an issue. Even if it were, the two or three pixels worth of problem wouldn't translate visually to print.

  

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  Dog-earMay 16, 08, 10:09 a.m. – Permalink

• mybrokenshoe

  Hey Folks, Thanks for the help,

  I not particularly fretting, it just bugs me seeing it in my images, I always seem to notice little bits.

  

  Yes it is really minor too! :)

  I will just work in RGB and then if needed convert to CMYK. That solves it.

  Thanks again folks.

  • <- Actual size left half with artfiacts right with none. that greenish edge drives me crazy :)– mybrokenshoe

  

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  Dog-earMay 16, 08, 10:25 a.m. – Permalink

• detritus

  

  • never seen anything like that.. its a PC thing?– horton1/2

    Balls.
    
    Maybe Macs are better?– detritus2/2

  

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  Dog-earMay 16, 08, 10:54 a.m. – Permalink

• epete22

  i got it on my mac but once i zoom in super close its fine

  

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  Dog-earMay 16, 08, 11:29 a.m. – Permalink

• mybrokenshoe

  Hey detritus, Very thorough!
  Thanks for checking it out, much appreciated.

  

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  Dog-earMay 16, 08, 11:59 a.m. – Permalink