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Agni7
Known Participant
October 5, 2018
質問

What should be the color profile for coloring comics for print?

  • October 5, 2018
  • 返信数 12.
  • 10045 ビュー

Hello!

I am working on a comic book. I am digitally coloring the comic in Photoshop CC 2014.

My color profile is sRGB. I finish coloring in the RGB settings and then change that to CMYK before print. But even then, the colors that get printed are very bland and darker than the ones I chose on screen.

I saw on another forum that working in Adobe RGB helps. Is that true?
How do I get the exact colors which I choose on screen, in print? Maybe  I am missing something pretty simple. I would request some advice and help regarding this issue!

Thanks in advance!

Regards

Agni

このトピックへの返信は締め切られました。

返信数 12

Participating Frequently
May 12, 2022

I find it difficult to print the original color as your design.

It's best if you have a talent then you should draw by yourself

D Fosse
Community Expert
Community Expert
October 7, 2018

Hey, everybody...you can't use a very poor quality phone snapshot of a printed page as reference. Just a quick correction to white and black points gives a very different impression.

In fact I think the most likely explanation here is that the OP's monitor is set way too bright.

rob day
Community Expert
Community Expert
October 7, 2018

Just a quick correction to white and black points gives a very different impression.

That's true, but if you convert the sRGB artwork to SWOP CMYK, and look at the output CMYK numbers you can see that it's more than a brightness problem. The blue converting to purple while the gray remains somewhat neutral can't be explained by monitor brightness. The purple in the print looks like it should be close to even amounts of cyan and magenta, but a SWOP conversion would output 50% more cyan:

I see CMYK-to-CMYK conversions all the time in workflows that get handed off multiple times. It's the reason making Photoshop CMYK conversions without direct communication with the printer is not a great idea.

rayek.elfin
Legend
October 6, 2018

I downloaded and checked the one page that you uploaded here. It's A4 format, correct?

Anyway, I noticed your line work is too low resolution for a quality comic print. Depending on the workflow (paper or fully digital) the line art is produced on paper and then scanned at 1200ppi, or the artist works at 1200ppi while preparing the line art.

The line art is then converted to pure 1bit monochrome, and the work coloured at 300ppi. Later the 1bit line art is overprinted with K black, which results in razor-sharp looking art.

But perhaps I have it wrong, and the page represents only a low-res 300ppi preview of the 1200ppi line art meant for colouring purposes in Photoshop?

Inspiring
October 6, 2018

A new test. I've downloaded the original image from #6.

First image:

Downsampled  for 72ppi and saved as sRGB JPEG image.

Second image:

First image converted to ISOCoated-v2-eci, converted to sRGB and saved as sRGB JPEG.

Surprisingly, the quality is rather good. Differences are hardly visible, though measurable.

The OP uses US Web Coated (SWOP) v2, this doesn't matter, in my opinion.

As a result I would say, the OP's basic concept is correct, but his color management is wrong.

Please, could someone reproduce my test?

Best regards --Gernot Hoffmann

A remark, correcting myself:  The whole gamut of ISOCoated-v2-eci is contained in AdobeRGB.

Therefore this color space could indeed be used, if the 'late' conversion to any CMYK space is

intended. Hopefully the operator uses a wide gamut monitor then...

1. image: sRGB

______________________________________________________________________________

2. image, CMYK as sRGB

rob day
Community Expert
Community Expert
October 6, 2018

A remark, correcting myself:  The whole gamut of ISOCoated-v2-eci is contained in AdobeRGB.

Therefore this color space could indeed be used, if the 'late' conversion to any CMYK space is

intended. Hopefully the operator uses a wide gamut monitor then

That's true, AdobeRGB would be better because ISOCoated is definitely not entirely inside the sRGB space, which in most cases makes it a bad choice. The gamut of the monitor might affect the fidelity of the soft proof, but doesn't stop the color clipping in the conversion from sRGB to ISOCoated. The only way to stop the clipping would be to color correct after the conversion. Here's sRGB (white) compared to ISOCoated.

Inspiring
October 6, 2018

In post #19 I had shown that one can convert the OP's sRGB sketch very reasonably

into CMYK (coated), whereas all the experts here thought that the OP´s CMYK result

would just reflect the unavoidable bad result of any RGB to CMYK conversion.

All this has nothing to do with line art and ppi and with sRGB versus AdobeRGB. For

the OP it would be helpful to know why his RGB to CMYK conversion is so terribly wrong

as shown in Post #6.

This is, of course not an attack, it's just a clarification.

Dear Rob,

I know already all these 3D-graphics:

http://docs-hoffmann.de/gamshow15052009.pdf 

Best regards --Gernot Hoffmann

meganchi
Legend
October 5, 2018

Let's explain RGB and CMYK.

RGB is based on light theory (red, green & blue light spectrum). Typically used to make prints from traditional film strips or for viewing on monitors, such as web site designs.

CMYK uses actual pigmented inks and will never reproduce as brightly as RGB. If you are designing, then begin designing in the colorspace to which your product will be output or the substrate it will be printed on. Start by asking your printer to supply you with their color profile or ask them what color space you should setup the art in upfront.

rob day
Community Expert
Community Expert
October 5, 2018

CMYK uses actual pigmented inks and will never reproduce as brightly as RGB.

Color gamuts go both ways—i.e., 100% cyan ink is not in the color gamut of most display RGB spaces.

Editing in CMYK has a number of problems. CMYK is device dependent, so you have to know the press profile before you start. With RGB you can set any CMYK space as the proof setup and use proof colors to see the CMYK conversion without actually making a conversion until the press profile is known. It also runs the risk of violating total ink limits—it would be possible to paint with 100|100|100|100 black (400%), or use a blending mode or adjustment layer (Invert white) that violates the limit.

In this case there might be a slight advantage to drawing the lines as black only, but then you would have to worry about trapping and making sure the black is consistent.

c.pfaffenbichler
Community Expert
Community Expert
October 6, 2018
In this case there might be a slight advantage to drawing the lines as black only, but then you would have to worry, about trapping and making sure the black is consistent.

In this case (the black linework seems fairly thin) I would personally prefer printing them as pure black.

By keeping them as a multiplying Layer (Solid Color or normal pixels, both an option) one could still do the coloring on lower Layers in RGB and then duplicate the image and merge all the colouring Layers with the white Background Layer (or convert them to a Smart Object) before converting and adjusting the linework-layer.

One might even go further and print the linework as a separate, overprinting bitmap image with a higher resolution but frankly that might be overkill …

Norman Sanders
Legend
October 5, 2018

If you are referring to color on newsprint consult the lithographer to get an idea of its color range and saturation limitations and certainly his specs for submitting the work for reproduction.

rob day
Community Expert
Community Expert
October 5, 2018

If you are referring to color on newsprint

If the printing is on newsprint or any uncoated sheet for that matter, then the conversion to the US SWOP Coated profile in Photoshop would be a huge problem. The total ink allowance for SWOP is 300%, which likely would force the printer to make an additional conversion in order to get to the typical newsprint total ink of between 220%-240%.

Also note that in the photo of the printed piece the grays in the fish have stayed relatively neutral, while the blue behind the inset has a fairly dramatic magenta cast. The default conversion from sRGB to SWOP for that blue would be around 75|44|6|0. Sure doesn't look like that's what output.

rob day
Community Expert
Community Expert
October 5, 2018

My color profile is sRGB. I finish coloring in the RGB settings and then change that to CMYK before print.

How are you laying out the book? With InDesign? Are you delivering a PDF to the printer or an InDesign Package? The printed book looks like there may have been an additional CMYK-to-CMYK conversion somewhere in the workflow. Your reds are certainly in a typical CMYK coated profile's gamut, so it doesn't seem like they should have gone that brown.

There are a number of places in the print workflow where there may have been additional CMYK conversions, especially if you are placing profiled CMYK images into an InDesign layout and exporting a PDF, so more details on your workflow might help.

It may not be the problem in this case, but there would be no benefit in using sRGB for this kind of art, so you should start using AdobeRGB

Inspiring
October 5, 2018

The first image shows all sRGB colors by steps of 5 units per channel. This should be reproduced

on all calibrated monitors correctly.

The second image shows the conversion into CMYK for ISOCoated-v2-eci by soft proof, followed

by a screenshot, re-opened in Photoshop, assigned monitor profile and converted to sRGB.

In other words - it's a reliable preview of the print result, concerning saturation and lightness,

besides hue.

If the comic designer starts (as expected by me) with rather saturated colors in RGB, he will be soon

victim of a severe loss of saturation or "brilliance".

Therefore it's in my opinion much better to start directly in the recommended CMYK space, which

allows as well the definition of black as K-only blacks, definitely necessary for avoiding ugly effects

of misregistration.

And indeed, there will be some more CMYK colors, which are not in the sRGB gamut, but starting

with AdobeRGB(98) won't be appropriate, altogether.

For international applications it has to be tested, whether a CMYK to CMYK conversion (excluding

black) would be crucial or desastrous.

Best regards--Gernot Hoffmann

Agni7
Agni7作成者
Known Participant
October 5, 2018

Hey, I was actually looking for such a chart when the RGB to CMYK conversion was not working to my expectations. I owe you one. I will surely test the CMYK range chart and see if those colors work fine! Many thanks!

Inspiring
October 5, 2018

Agni, thanks for the feedback. The RGB-CMYK comparison is based on my CMYK-swatchbook

with RGB appendix:

http://docs-hoffmann.de/swatch22112002.pdf

The CMYK pages show all CMYK values by steps of 10 for each of the four channels.

There is no profile included. It's a CMYK document by numbers.

It can be used alternatively as follows:

a) Define a CMYK space in Photoshop and load a page. View...

b) Load a page in Photoshop and assign a CMYK space. View...

c) Print by any CMYK PostScript printer without color management. This would create a

swatchbook for this printer+ink+rasterization. Useful for designing and printing posters for

exhibitions.

Swatchbooks for standard CMYK spaces are available (actually for processes, because

paper and rasterization are defined as well). Very useful for prepress work for offset printing.

Best regards  --Gernot Hoffmann

Muqqarib Hassan
Inspiring
October 5, 2018

Hi,

if you’re going to be printing something, such as a business card, stationary, or a newsletter, use CMYK. CMYK does not include a white color because it is assumed that it will be printed on a white paper and depending on the percentage of each color that is used, the white from the paper will be used to fill the space, therefore making the shades appear lighter.

If it’s something that will only be seen digitally, use RGB. The Internet is set up to work exclusively with RGB colors and there is a simple explanation behind this. A digital monitor is made up of tiny units called pixels. These pixels are comprised of three light units, one for red, one for green, and one for blue. The RGB values are applied to these pixels, thereby setting the luminosity for each of the light units in each pixel.

Agni7
Agni7作成者
Known Participant
October 5, 2018

Yup I know that!
That is first fact to know when working with digital media and print.

The issue is why isn't it following perfectly in actual life!? That's the problem. I know the fact, I just want to know the real life scenario, because somehow I am missing something.

rob day
Community Expert
Community Expert
October 5, 2018

I saw on another forum that working in Adobe RGB helps. Is that true?

It could.

The sRGB color space does not contain a significant portion of a typical CMYK space's colors, so when you make the conversion from sRGB to CMYK the CMYK colors that are not inside of the sRGB gamut get clipped. Saturated blues, cyans, and yellows can be affected.