How can I cycle through hex color codes in PHP?

Question

I want an array where each field in the array contains a color code

array(0 => '#4CFF00', 1 => '#FFE97F')

And I want this to go through the whole spectrum of colors starting from green to black.

green-> blue -> dark blue -> purple -> yellow -> orange -> red -> brown ->black

This order doesn't need to be exactly the same, but I think you get the picture. Can anybody help with this? Is there a website that has done this before?

Answer 1

http://www.visibone.com/colorlab/

Answer 2

http://colorschemedesigner.com/

Answer 3

00FF00 is Green 000000 is Black. all you have to do it increment one color at a time while decrementing the other colors. Stick it in a loop, where it be php, javascript or whatever and go.

EDIT: Here is a link to code that shows how to loop through Hex color codes.

Answer 4

You need some color schemes? I think it depends on the color scheme of the rest of your page. You can google "Color scheme generators" and you can find at least 10. Examples provided by @edg and @santiiiii above.

If you have a photo, there is a tool which can get colors from the photo to fit your site.

http://www.atalasoft.com/31apps/ColorSchemeGenerator/

Answer 5

I recommend writing a function to do this. If you need to go between multiple colors, just call it multiple times and concatenate the arrays.

Psuedocode: `colorRange(arrayReference, startColor, endColor, numSteps)`

Get {R, G, B} startColor and endColor
Get R_diff, G_diff, and B_diff

for i in 0 to numSteps {
   arrayReference.append(
          i => {min(startR, endR) + (R_diff * (i / numSteps)),
                min(startG, endG) + (G_diff * (i / numSteps)),
                min(startB, endB) + (B_diff * (i / numSteps))}
          )
}

Answer 6

Look at hexdec, dechex and this snippet:

for ($i = 0; $i < 255; $i++) {
    # here happens some colour-magic
}

Cheers,

Answer 7

function dechexpad($i){
$s="";
if($i<16) $s="0";
$s.=dechex($i);
return $s;
}
function hexcolor($r,$g,$b){
return "#".dechexpad($r%255).dechexpad($g%255).dechexpad($b%255);
}

$xx=array();
for($i=0;$i<255;$i++){
$xx[]=hexcolor($i*4,$i*2,$i);
}

Answer 8

function list_colours($start, $end, $steps = 5)
{
    $ret = array();

    $start_r = hexdec(substr($start, 1, 2));
    $start_g = hexdec(substr($start, 3, 2));
    $start_b = hexdec(substr($start, 5, 2));
    $end_r = hexdec(substr($end, 1, 2));
    $end_g = hexdec(substr($end, 3, 2));
    $end_b = hexdec(substr($end, 5, 2));

    $shift_r = ($end_r - $start_r) / $steps;
    $shift_g = ($end_r - $start_r) / $steps;
    $shift_b = ($end_r - $start_r) / $steps;

    for ($i = 0; $i < $steps; $i++)
    { $ret[] = "#".dechex($start_r + i * $shift_r).dechex($start_g + i * $shift_g).dechex($start_b + i * $shift_b); }

    return $ret;
}

$spectrum = array();
array_push($spectrum, "#00FF00", "#0000FF"); // green to blue
array_push($spectrum, "#0000FF", "#000066"); // blue to dark blue
// etc...

Disclaimer: not tested in the least.

Answer 9

I guess if you need all of those colors you could build the 16776960 element array as follows:

<?php
    $end = 'FFFFFF';

    $arrMassiveColor = array();

    for($curr = 0; $curr <= dechex($end); $curr++) {
        $arrMassiveColor[] = '#'.hexdec($curr);
    }
?>

It seems a bit odd though...