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Cobalt

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Posts posted by Cobalt

  1. 3 minutes ago, Lagarto said:

    If you stil have the print pdf of the book cover and open it in Photoshop, do you get the same values? If you do, I'd say the printer has made a mistake. One possible explanation may be that the deep black in the cover may have contained too much tint for their process and they have run a routine that reduces tint. In that process, the grays have changed, as well, but in a way that has caused cyan to become too prominent.  

    Yes, the PDF opened back in Photo displays neutral as expected and the CMYK values are mentioned earlier.

    Thanks for your thoughts on this. At least I am not going crazy.

  2. 5 minutes ago, Lagarto said:

    Colors are complex. How badly were they tinted -- ever so slight cyan tone can be expected with these values, but it also depends on paper, and naturally on viewing conditions. If you want to have absolutely neutral grays, you should use mere K values. 

    @Lagarto Compared to the gray card (bottom of attached photo) there is a significant tint I think. Is this normal ? (unless we are looking at ghosting and their cyan plate is not properly aligned ?)

    P1002456.JPG

  3. @mac_heibu

    Indeed color management is a complex topic.

    Recently I sent a PDF file to a printer (the Affinity document was in CMYK and I embedded the ICC profile during export).
    95% of the file was neutral gray with a few touches of color in a couple of places.

    All grays came back cyan tinted. The printer argues with me that all my Cyan values are elevated like the OP example CMYK (60,52,52,21) and they claim it is my fault.

    I don't understand why say that. I thought once they have the ICC they can work back to neutral.

  4. In Affinity starting with an RGB value of (100,100,100) translates to a CMYK value of (60,52,52,21).
    -> Why so much cyan ?
    -> Why is it different than this ? (here or here)
    -> If I plug the CMYK (60,52,52,21) in reverse here I get rgb(80,95,95) with a cyan tint, but affinity says rgb (102,100,100). Why ?

    In the attached file the color format is set to CMYK with profile (US Web coated SWOP v2).
    -> Exporting the file to PNG gives me correct result (exactly as shown on screen) 
    -> Exporting to JPEG with color profile included gives me a cyan tint. Why ? (it doesn't include the profile after all ?)

    ColorTest.afdesign

    Export.png

    Export.jpg

  5. 10 minutes ago, carl123 said:

    This post explains why you get half the size at 144

    https://forum.affinity.serif.com/index.php?/topic/83492-export-persona-scale-problems/&do=findComment&comment=441920

    I also saw we get half the size at 96dpi when it should be 192dpi but I had lost the will to live by then 

    Quote

    Because your document is set to 144 DPI the Export Persona automatically creates half size exports when outputting to 1x format, the correct size when outputting at 2x, and double size when out putting at 3x. If you work at 288dpi, then your document will export at the correct size when using 3x, half size then using 2x and then half that when using 1x.

    I don't even care to know in what universe such convoluted logic makes sense.

  6. On 4/18/2019 at 7:05 AM, Sean P said:

    Because your document is set to 144 DPI the Export Persona automatically creates half size exports when outputting to 1x format, the correct size when outputting at 2x, and double size when out putting at 3x. If you work at 288dpi, then your document will export at the correct size when using 3x, half size then using 2x and then half that when using 1x.

    If you work at any other DPI other than those 2 then you should be ok!

    Hope that helps!
     

    I have no idea what you just said, neither would I ever remember it. Why trip up the customers so deliberately ?

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