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Convert RGB color to CMYK?


Convert RGB color to CMYK?

By : user3854106
Date : January 02 2021, 06:48 AM
this will help The conversion from RGB to CMYK is dependent on the physical device/process being used to lay down the CMYK ink. These are represented in software as Color Profiles. ICC and ICM color profiles of physical devices determine the resulting colors.
If you are not concerned with true representation on a physical device then use the direct conversion formulas in other posts.
code :


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What is the formula to convert a color in CMYK to hex?

What is the formula to convert a color in CMYK to hex?


By : hyungyu lee
Date : March 29 2020, 07:55 AM
wish helps you I have bad news for you: there is no simple formula. Cyan, magenta and yellow are complex ink colours and the translation to RGB depends on colour profiles. To make things worse, the CMYK colour space is smaller than the RGB colour space. Some pointers on colour theory:
handprint: do "primary" colors exist? Plotting colors properly on a computer screen
Convert RGB PNG to CMYK JPEG (using ICC Color Profiles)

Convert RGB PNG to CMYK JPEG (using ICC Color Profiles)


By : Anthony Bruno
Date : March 29 2020, 07:55 AM
Hope that helps The problem was solved by using TYPE_3BYTE_BGR instead of TYPE_INT_RGB.
code :
public static void main(String[] args) throws Exception
{
    final String imageFile = "/tmp/page0.png";

    final BufferedImage pngImage = ImageIO.read(new File(imageFile));

    // convert PNG to JPEG
    // http://www.mkyong.com/java/convert-png-to-jpeg-image-file-in-java/
    final BufferedImage rgbImage = new BufferedImage(pngImage.getWidth(), pngImage.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
    rgbImage.createGraphics().drawImage(pngImage, 0, 0, Color.WHITE, null);

    // RGB to CMYK using ColorConvertOp
    // http://stackoverflow.com/questions/380678/how-to-set-icc-color-profile-in-java-and-change-colorspace/2804370#2804370
    final ICC_Profile ip = ICC_Profile.getInstance("icc/USWebUncoated.icc");

    final ColorConvertOp cco = new ColorConvertOp(rgbImage.getColorModel().getColorSpace(), new ICC_ColorSpace(ip), null);

    final BufferedImage cmykImage = new BufferedImage(pngImage.getWidth(), pngImage.getHeight(), BufferedImage.TYPE_3BYTE_BGR);

    cco.filter(rgbImage, cmykImage);

    // Write the result into an bytearray
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageIO.write(cmykImage, "JPEG", baos);
    baos.flush();
}
Create CMYK+alpha bitmap, mapping black to specific CMYK color

Create CMYK+alpha bitmap, mapping black to specific CMYK color


By : jassi sandhu
Date : March 29 2020, 07:55 AM
will help you Jos Vernon at websupergoo came up with a splendidly simple answer that uses ABCpdf capabilities.
code :
using WebSupergoo.ABCpdf10;
using WebSupergoo.ABCpdf10.Objects;

namespace RecolorRenderedImage
{
    class Program
    {
        static void Main(string[] args)
        {
            using (Doc theDoc = new Doc()) {
                // this background image is there to prove that the text is not obscuring other pdf objects
                theDoc.AddImage("c:\\temp\\background-pic.jpg");

                // this is the black warped text
                string fullFilePath = "c:\\temp\\foobar.png";

                // read it into an XImage. Add to the doc, and retrieve the pixmap
                XReadOptions readOptions = new XReadOptions();
                XImage image = XImage.FromFile(fullFilePath, readOptions);
                int theID = theDoc.AddImageObject(image, true);
                int imageID = theDoc.GetInfoInt(theID, "XObject");
                PixMap thePM = (PixMap)theDoc.ObjectSoup[imageID];

                // recolor the pixmap temporary spot color space with the desired color (gold in this case)
                int spotColorID = theDoc.AddColorSpaceSpot("tempSpace", "24 44 100 2");
                ColorSpace theSP = (ColorSpace)theDoc.ObjectSoup[spotColorID];
                thePM.Recolor(theSP);

                // immediately recolor the pixmap back to CMYK
                ColorSpace theSP2 = new ColorSpace(theDoc.ObjectSoup, ColorSpaceType.DeviceCMYK);
                thePM.Recolor(theSP2);

                theDoc.Save("c:\\temp\\test.pdf");
            }
        }

    }
}
I create a cmyk image by php imagemagick, but cmyk color is different on photoshop?

I create a cmyk image by php imagemagick, but cmyk color is different on photoshop?


By : Jeff Farrugia
Date : March 29 2020, 07:55 AM
I hope this helps . You need to set the colorspace to CMYK, other wise your pixels will be converted to RGB.
code :
$img->setImageColorspace(Imagick::COLORSPACE_CMYK);
$draw = new \ImagickDraw();

$fillColor = new \ImagickPixel();    
$fillColor->setColor('cmyk(0%,0%,0%,100%');
$draw->setFillColor($fillColor);
$draw->rectangle(100, 100, 400, 400);

$img = new \Imagick();
$img->newImage(500, 500, 'white');
$img->drawImage($draw);
$img->transformImageColorspace(Imagick::COLORSPACE_CMYK);
$img->setImageFormat("jpg");

header('Content-Type: image/'.$img->getImageFormat());
echo $img;
Convert a CMYK color to RGB using a color profile like ISO V2 Coated?

Convert a CMYK color to RGB using a color profile like ISO V2 Coated?


By : Maxim Feshchuk
Date : March 29 2020, 07:55 AM
To fix this issue The following method performs CMYK/RGB color-managed conversion in the Ruby environment via ImageMagick:
code :
def convert_cmyk_to_rgb_with_profiles(cmyk, profile_1, profile_2)
  c = MiniMagick::Tool::Convert.new

  c_255 = (cmyk[:c].to_f / 100.0 * 255.0).to_i
  m_255 = (cmyk[:m].to_f / 100.0 * 255.0).to_i
  y_255 = (cmyk[:y].to_f / 100.0 * 255.0).to_i
  k_255 = (cmyk[:k].to_f / 100.0 * 255.0).to_i

  c.xc("cmyk(#{c_255}, #{m_255}, #{y_255}, #{k_255})")
  c.profile(File.open("lib/assets/profiles/#{profile_1}.icc").path)
  c.profile(File.open("lib/assets/profiles/#{profile_2}.icc").path)
  c.format("%[pixel:u.p{0,0}]\n", "info:")
  result = c.call

  srgb_values = /srgb\(([0-9.]+)%,([0-9.]+)%,([0-9.]+)%\)/.match(result)

  r = (srgb_values[1].to_f / 100.0 * 255.0).round
  g = (srgb_values[2].to_f / 100.0 * 255.0).round
  b = (srgb_values[3].to_f / 100.0 * 255.0).round

  return { r: r, g: g, b: b }
end
convert_cmyk_to_rgb_with_profiles({c:100, m:0, y:0, k:0}, "USWebCoatedSWOP", "sRGB_IEC61966-2-1_black_scaled")
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