How to print RGB color's name in objective c?

Question

I select the color in RGB and save it in string with color name

my code

color =[UIColor colorWithRed:255/255.0 green:0.0/255.0 blue:0.0/255.0 alpha:pixel[3]/255.0];

Current Output: Color print: 1 0 0 1

Expected output: Color = Red

What about overriding `description`, check if it matches any of the "known iOS" color, and print as? — Larme, Oct 22 '13 at 21:29
[My answer here](http://stackoverflow.com/questions/19454398/java-applet-get-the-name-of-the-colour-being-used-in-paint/19461345#19461345) might be of use. — user1118321, Oct 23 '13 at 01:35

score 2 · Answer 1 · answered Apr 06 '15 at 08:01

2

Go throuhg this link.. Best solution for me. Might be help you guys also.

https://github.com/daniel-beard/DBColorNames

answered Apr 06 '15 at 08:01

Arpan Dixit

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Abhinav · Answer 2 · 2013-10-22T19:43:00.127

1

I don't think there is a way to print the name of the color. There are plenty of such combinations. You can print the RGB values as a string though:

CGColorRef colorRef = [UIColor grayColor].CGColor;
NSString *colorString = [CIColor colorWithCGColor:colorRef].stringRepresentation;
NSLog(@"colorString = %@", colorString);

To print actual names you need to do more work on your own. Saving names with RGB values and then retrieving them based on your combinations.

edited Oct 22 '13 at 19:43

answered Oct 22 '13 at 19:28

Abhinav

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no add color name but add only RGB Color code to fech color name Graycolor,bule,black ,etc.... – hemant Oct 22 '13 at 19:33
I get what you are looking for. But that is not possible. Even with the color name I mentioned above, you would get RGB and alpha components printed. Imagine there are so many color combinations! – Abhinav Oct 22 '13 at 19:37
i have touch image and fetch select ted image color and pass to webservice – hemant Oct 22 '13 at 19:47

score 1 · Answer 3 · answered Oct 27 '13 at 16:30

I just tried this and it seems to work pretty well. The hard-coded values I chose are based on how things looked to me. Feel free to change them if "bright" and "dark" mean something else to you.

- (NSString*)colorNameFromColor:(NSColor*)chosenColor
{
    NSColor*    calibratedColor = [chosenColor colorUsingColorSpaceName:NSCalibratedRGBColorSpace];

    CGFloat  hue;
    CGFloat  saturation;
    CGFloat  brightness;
    [calibratedColor getHue:&hue
                 saturation:&saturation
                 brightness:&brightness
                      alpha:nil];

    // I found that when the saturation was below 1% I couldn't tell
    // the color from gray
    if (saturation <= 0.01)
    {
        saturation = 0.0;
    }

    NSString*   colorName   = @"";

    // If saturation is 0.0, then this is a grayscale color
    if (saturation == 0.0)
    {
        if (brightness <= 0.2)
        {
            colorName = @"black";
        }
        else if (brightness > 0.95)
        {
            colorName = @"white";
        }
        else
        {
            colorName = @"gray";

            if (brightness < 0.33)
            {
                colorName = [@"dark " stringByAppendingString:colorName];
            }
            else if (brightness > 0.66)
            {
                colorName = [@"light " stringByAppendingString:colorName];
            }
        }
    }
    else
    {
        if ((hue <= 15.0 / 360.0) || (hue > 330.0 / 360.0))
        {
            colorName = @"red";
        }
        else if (hue < 45.0 / 360.0)
        {
            colorName = @"orange";
        }
        else if (hue < 70.0 / 360.0)
        {
            colorName = @"yellow";
        }
        else if (hue < 150.0 / 360.0)
        {
            colorName = @"green";
        }
        else if (hue < 190.0 / 360.0)
        {
            colorName = @"cyan";
        }
        else if (hue < 250.0 / 360.0)
        {
            colorName = @"blue";
        }
        else if (hue < 290.0 / 360.0)
        {
            colorName = @"purple";
        }
        else
        {
            colorName = @"magenta";
        }

        if (brightness < 0.5)
        {
            colorName = [@"dark " stringByAppendingString:colorName];
        } 
        else if (brightness > 0.8)
        {
            colorName = [@"bright " stringByAppendingString:colorName];
        }
    }

    return colorName;
}

this not good ,want all color name , nay idea about it or suggestion ? — Dhaval Bhadania, Oct 04 '14 at 08:16

score 0 · Answer 4 · answered Oct 22 '13 at 19:24

0

Try like this:-

color =[UIColor colorWithRed:66.0f/255.0f green:79.0f/255.0f blue:91.0f/255.0f alpha:1.0f]

answered Oct 22 '13 at 19:24

Hussain Shabbir

14,801
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i have print no RGB Color code to name but i have print color name Black ,blue ,red etc... – hemant Oct 22 '13 at 19:28
i have tray this code out put : UIDeviceRGBColorSpace 0.258824 0.309804 0.356863 1 Request out put not color RGB code but Color name – hemant Oct 22 '13 at 19:31

score 0 · Answer 5 · answered Oct 22 '13 at 19:39

0

There is no built-in way in Foundation to do this but if you really want to do this due to any requirement. Here's what you can do:

1- Pick the list of colors along with their names here

2- Save those color names somewhere against RGB value.

3- Now, you can pick color name which has the closest match to the RGB value.

answered Oct 22 '13 at 19:39

nomann

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i have touch to image and fetch color name – hemant Oct 22 '13 at 19:43
my fetch color code unsigned char pixel[4] = {0}; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, kCGImageAlphaPremultipliedLast); CGContextTranslateCTM(context, -point.x, -point.y); [self.view.layer renderInContext:context]; CGContextRelease(context); CGColorSpaceRelease(colorSpace); UIColor *color = [UIColor colorWithRed:pixel[0]/255.0 green:pixel[1]/255.0 blue:pixel[2]/255.0 alpha:pixel[3]/255.0]; – hemant Oct 22 '13 at 19:43

How to print RGB color's name in objective c?

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