What is the formula to determine the precise hue-rotate needed for producing a particular shade?

I'm looking to change the color of a white background image in a div to match the main theme color. I know I can use filters like sepia(), saturate(10000%), and hue-rotate() to achieve this, but is there a way to calculate these values beforehand? Since my hex value is quite dark, I might need to include the invert() filter as well.

Given the hex value #689d94, how would I calculate the necessary hue-rotate and invert values to transform my white background image into that color?

Edit

Here's an example of a div with a white background image filtered to green. The key here is that the entire div is being filtered, not just the image. If text is added to the div, it will also be colored green.

div {
  background:url(http://richard.parnaby-king.co.uk/basket.svg) no-repeat scroll 0 0 transparent;
  background-size:5em;
  width:5em;
  height:5em;
  -webkit-filter: invert(25%) sepia() saturate(100000%) hue-rotate(174deg);
  filter: invert(25%) sepia() saturate(100000%) hue-rotate(174deg);
}
<div></div>
<p style="background: #689d94">​</p>

Answer №1

One important aspect to consider is choosing an initial color. Technically, white, black, and grayscale are not actual colors as they cannot be saturated or rotated. To work with these shades, a form of colorization must be applied, such as the sepia filter.

If the image were a 100% pure red, it would be easier to achieve the desired result by directly adding the target degree and adjusting saturation and lightness using HSL (Hue, Saturation, Lightness). However, since we are starting with white, the first step is to convert it into an intermediate color that can be later saturated and rotated.

Let's begin by darkening the white image and applying the sepia filter to obtain a "base" color for further adjustments:

filter: brightness(50%) sepia(1);

The above code will produce an approximately RGB color value of:

rgb(178, 160, 128)

The second step involves converting this base color to the target color. This process remains static, meaning its result can be reused every time a target adjustment is needed. By converting the target color (#689d94 in this example) to its corresponding HSL values, we get:

hsl(170, 21.3%, 51.2%);

Resulting Base Color

div {
  background:url(http://richard.parnaby-king.co.uk/basket.svg) no-repeat;
  background-size:5em;
  width:5em;
  height:5em;
  -webkit-filter: brightness(50%) sepia(1);
  filter: brightness(50%) sepia(1);
}
<div></div>

Converting Base Color to Target Color

The hue, saturation, and lightness values between the base color and target color need to be calculated. To determine the hue, subtract the base hue value from the target hue value. For saturation and lightness, assume a base value of 100% and calculate the difference accordingly:

H:  170 - 38             ->  132°
S:  100 + (24.5 - 21.3)  ->  103.2%  (relative to base 100% =  3.2%)
L:  100 + (51.2 - 60.0)  ->   91.2%  (relative to base 100% = -8.8%)

Concatenate these values into a filter string and append them to the existing filter. Finally, apply this updated filter to the div element:

/*      ------ base color ------  -------  new target -------------------------------*/
filter: brightness(50%) sepia(1)  hue-rotate(132deg) saturate(103.2%) brightness(91.2%);

To set this filter dynamically, utilize JavaScript and modify the style of the div element:

...
filter = "brightness(0.5) sepia(1) hue-rotate(132deg) saturate(103.2%) brightness(91.2%)";
divElement.style.filter = filter;
divElement.style.webkitFilter = filter;

Note that due to rounding errors between integer-based RGB and floating point HSL representations, the actual result may not be exact but should closely approximate the target color.

Live Example

div {
  background:url(http://richard.parnaby-king.co.uk/basket.svg) no-repeat;
  background-size:5em;
  width:5em;
  height:5em;
  -webkit-filter: 
      brightness(50%) sepia(1) hue-rotate(132deg) saturate(103.2%) brightness(91.2%);
  filter: 
      brightness(50%) sepia(1) hue-rotate(132deg) saturate(103.2%) brightness(91.2%);
}
<div></div>
<span style="font:14px sans-serif;padding:7px;color:#fff;background:#689d94">
Target color</span>

Viable alternatives include:

  • Predefining SVGs with the desired colors already set.
  • Working directly with HSL/RGB values in JavaScript and modifying the SVG tree to incorporate the required color. This approach avoids filters, which can impact performance, especially when chaining multiple filters together as shown here. Additionally, not all browsers support filters.

Answer №2

The answer provided is incorrect. The hue-rotate method does not maintain saturation or brightness, requiring complex calculations to obtain accurate values.

[Update: The original poster has modified their response and the statements mentioned above are no longer valid]

A simpler approach that guarantees correct results is to use a CSS filter that references an SVG filter. By utilizing the feColorMatrix primitive within SVG filters, it becomes possible to directly select a color.

For instance, take the color #424242 - divide each RGB channel value by #FF and input them into the fifth column of the first three rows within your color matrix. In this specific case, hex #42 equals 68 in decimal, dividing it by 255 (#FF in decimal) yields 0.257 - which will be placed in the fifth column of the first three rows.

div {
  background:url(http://richard.parnaby-king.co.uk/basket.svg) no-repeat scroll 0 0 transparent;
  background-size:5em;
  width:5em;
  height:5em;
  -webkit-filter: url(#colorize);
  filter: url(#colorize);
}
<div>
  </div>

<svg>
<defs>
<filter id="colorize" color-interpolation-filters="sRGB">
<feColorMatrix type="matrix" values="0 0 0 0 .257
                                 0 0 0 0 .257
                                 0 0 0 0 .257
                                 0 0 0 1 0"/>
 
/filter>
</defs>
</svg>

Answer №3

The best way to achieve an exact match is by utilizing an SVG color matrix filter.

If you have an RGB color code like #689d94, which translates to rgb(104, 157, 148), you can easily obtain the desired effect by dividing each primary color value by 255:

To implement this, simply insert the provided weights into the SVG <filter> matrix's fifth column within the first three rows:

<svg xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="689d94" color-interpolation-filters="sRGB">
      <feColorMatrix type="matrix" 
        values="0 0 0 0 0.40784 
                0 0 0 0 0.61569 
                0 0 0 0 0.58039 
                0 0 0 1 0"/>
    </filter>
  </defs>
</svg>

The <filter> element must have a unique identifier (in this case, I used the RGB hex code 689d94) so we can reference it correctly.

However, consider that some browsers (such as Firefox) might not recognize or apply the SVG filter if the display property of the SVG element is set to none. Moreover, having the SVG element in HTML code could unnecessarily occupy space. To overcome these drawbacks, it's more advisable to transform the SVG into a pure inline CSS filter.

To obtain an inline filter value, you need to take the previously mentioned SVG code, remove line breaks and unnecessary spaces to make it a single-line string, and then prepend url('data:image/svg+xml, before appending the aforementioned unique identifier as #689d94'):

div {
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="71.063" height="60.938"><path d="M33.938 0l-16.97 19.906H1.625L0 21.781v8.781l1.25 1.407h4.781l5.875 28.969h46.969l6.188-28.97h4.687l1.313-1.343v-8.844L69.5 19.906H54.656L37.312 0h-3.375zm1.593 7.594l9.594 12.312H26.25l9.281-12.312zm-20.281 16s-.405 2.9 1.594 3.844c1.998.942 4.406.03 4.406.03-1.666 2.763-3.638 3.551-5.469 2.688-3.312-1.562-.531-6.562-.531-6.562zm41.188.031s2.749 4.969-.563 6.531c-2.487 1.162-4.848-1.541-5.438-2.656 0 0 2.377.88 4.375-.063 1.999-.942 1.625-3.812 1.625-3.812z"/></svg>') no-repeat; // optimized from http://richard.parnaby-king.co.uk/basket.svg
  background-size: 100%;
  display: inline-block;
  height: 5em;
  width: 5em;
}
#colored {
  filter: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg"><defs><filter id="689d94" color-interpolation-filters="sRGB"><feColorMatrix type="matrix" values="0 0 0 0 0.40784 0 0 0 0 0.61569 0 0 0 0 0.58039 0 0 0 1 0"/></filter></defs></svg>#689d94');
  margin-left: 20px;
}
<!-- No <svg> in HTML; pure CSS -->
<div></div><div id="colored"></div>
<p style="background: #689d94">​</p>

Answer №4

CSS Filter Converter for Hex Colors

Discover an efficient tool to convert hex colors into CSS filters by visiting:

Answer №5

Here is a unique extension method in C# that I came up with:

public static class CustomColorExtensions
{
    public static string ConvertToSvgFilter(this string value)
    {
        Color color = ColorTranslator.FromHtml(value);
        int r = Convert.ToInt16(color.R);
        int g = Convert.ToInt16(color.G);
        int b = Convert.ToInt16(color.B);

        decimal converted_r = (decimal)r / 255;
        decimal converted_g = (decimal)g / 255;
        decimal converted_b = (decimal)b / 255;

        return $"url('data:image/svg+xml,<svg xmlns=\"http://www.w3.org/2000/svg\"><defs><filter id=\"{value.Replace("#", "")}\" color-interpolation-filters=\"sRGB\"><feColorMatrix type=\"matrix\" values=\"0 0 0 0 {converted_r} 0 0 0 0 {converted_g} 0 0 0 0 {converted_b} 0 0 0 1 0\"/></filter></defs></svg>{value}')";
    }
}

You can use it like this:

    protected override async Task OnInitializedAsync()
    {
        _menuItemSvgFilter = "#f20c96".ConvertToSvgFilter();            

        await base.OnInitializedAsync();
    }

Here is an example of how to use it in your razor code:

<NavLink class="menu-font" href="inboundorders">
     <img src="/img/svg_icon/ICON_ORDER.svg" /> Orders
</NavLink>

To apply the styling, make sure to add this CSS at the end:

<style type="text/css">
.menu-font img 
{
    filter: @_menuItemSvgFilter;
}
</style>

Answer №6

If you are using SVG, you can follow these steps:

  1. Open the SVG file with a text editor.
  2. Copy and paste the contents into an HTML file.
  3. Change the path color as required by modifying the fill attribute of the respective element.

In the example code below, I have changed the path color of the center ring:

var imgg = document.getElementById("path");
imgg.style.fill = "#424242";

To use SVG as a background image, you can do the following:

  1. Create an SVG file with the desired shape and colors.
  2. Convert the SVG file to a data URI string.
  3. Set the background image of an HTML element using CSS and the data URI string.

In the example code below, I have set the background image of a div element:

var myimg = 'url(data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" id="Capa_1" x="0px" y="0px" viewBox="0 0 296.838 296.838" style="enable-background:new 0 0 296.838 296.838;" xml:space="preserve" width="512px" height="512px"><g><path d="M58.733,64.566L41.763,47.596C14.832,74.526,0,110.333,0,148.419s14.832,73.893,41.763,100.823l16.971-16.971   C36.335,209.874,24,180.095,24,148.419S36.335,86.964,58.733,64.566z" fill="#91DC5A"/><path d="M82.137,81.969c-17.75,17.748-27.525,41.348-27.525,66.45s9.775,48.702,27.525,66.45l16.971-16.971   c-13.218-13.216-20.496-30.788-20.496-49.479s7.278-36.264,20.496-49.48L82.137,81.969z" fill="#91DC5A"/><path d="M255.075,47.596l-16.971,16.971c22.399,22.397,34.733,52.177,34.733,83.853s-12.335,61.455-34.733,83.852l16.971,16.971   c26.931-26.931,41.763-62.737,41.763-100.823S282.006,74.526,255.075,47.596z" fill="#91DC5A"/><path d="M214.701,81.969L197.73,98.939c13.218,13.216,20.496,30.788,20.496,49.48s-7.278,36.264-20.496,49.479l16.971,16.971   c17.75-17.748,27.525-41.348,27.525-66.45S232.451,99.717,214.701,81.969z" fill="#91DC5A"/><path d="M148.586,114.789c-8.607,0-17.212,3.284-23.78,9.851c-13.131,13.133-13.131,34.424,0,47.559   c6.568,6.566,15.174,9.851,23.78,9.851c8.606,0,17.212-3.284,23.779-9.851c13.131-13.135,13.131-34.426,0-47.559   C165.798,118.073,157.192,114.789,148.586,114.789z M155.395,155.228c-2.454,2.454-5.319,2.821-6.809,2.821   c-1.489,0-4.356-0.367-6.808-2.818c-3.755-3.756-3.755-9.867-0.003-13.619c2.455-2.455,5.321-2.822,6.811-2.822   c1.489,0,4.354,0.367,6.808,2.82C159.147,145.363,159.147,151.475,155.395,155.228z" fill="#91DC5A"/></g></svg>)';

document.getElementById("mydiv").style.backgroundImage = myimg;

// Changing color according to a new theme - new theme color: #424242
myimg = myimg.replace(/#91DC5A/g, "#424242");
document.getElementById("mydiv").style.backgroundImage = myimg;
div {
  background-size: 5em;
  width: 5em;
  height: 5em;
}

Target color

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