PHP - 替换图像中的颜色 [英] PHP - Replace colour within image

问题描述

我希望有人可以帮助，

我制作了一个掩盖图片的脚本...但是它依赖于一种颜色来掩盖（'green screen'样式）。麻烦的是，如果我掩盖的图像包含那种颜色，它被毁了。

I have made a script that masks images... however it is reliant on a colour to mask with ( 'green screen' style). The trouble is if the image that I am masking contains that colour it is ruined.

我想要做的是在掩蔽图像之前替换任何发生的我的键

What I am looking to do is prior to masking the image replace any occurance of my keying colour (0,0,255) with a similar colour such as 0,0,254.

我已经找到了一些基于gif或256色PNG的解决方案，因为它们被索引..

I have found a few solutions based around gif's or 256 colour PNG as they are indexed..

所以我的问题也是更有效的将它转换为一个gif或256 png然后看看索引，替换颜色或搜索每个像素和替换

So my question is also will it be more efficient to convert it to a gif or 256 png then look through the index and replace the colour or search through every pixel and replace the colours.

感谢，

推荐答案

输入文件并扫描每个像素以检查您的chromokey值。

You need to open the input file and scan each pixel to check for your chromokey value.

像这样：

// Open input and output image
$src = imagecreatefromJPEG('input.jpg') or die('Problem with source');
$out = ImageCreateTrueColor(imagesx($src),imagesy($src)) or die('Problem In Creating image');

// scan image pixels
for ($x = 0; $x < imagesx($src); $x++) {
    for ($y = 0; $y < imagesy($src); $y++) {
        $src_pix = imagecolorat($src,$x,$y);
        $src_pix_array = rgb_to_array($src_pix);

            // check for chromakey color
            if ($src_pix_array[0] == 0 && $src_pix_array[1] == 0 && $src_pix_array[2] == 255) {
                $src_pix_array[2] = 254;
            }


        imagesetpixel($out, $x, $y, imagecolorallocate($out, $src_pix_array[0], $src_pix_array[1], $src_pix_array[2]));
    }
}


// write $out to disc

imagejpeg($out, 'output.jpg',100) or die('Problem saving output image');
imagedestroy($out);

// split rgb to components
function rgb_to_array($rgb) {
    $a[0] = ($rgb >> 16) & 0xFF;
    $a[1] = ($rgb >> 8) & 0xFF;
    $a[2] = $rgb & 0xFF;

    return $a;
}

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