PHP copy palette from one image to another

php editor Strawberry brings you tips on how to copy a color palette from one image to another. In the image processing process, the color palette is a very important element, which determines the color expression of the image. Through PHP's image processing function, we can easily implement this function, making your image processing more flexible and efficient. Next, let’s discuss the specific implementation methods!

Copy a palette from one image to another

In php, you can easily copy a palette from one image to another using the GD library. Here are the detailed steps:

1. Create source and target images

$srcImage = imagecreatefromjpeg("source.jpg");
$dstImage = imagecreate(width, height);

2. Create palette

$palette = imagecreatetruecolor(256, 1);
imagefilledrectangle($palette, 0, 0, 255, 1, 0xFFFFFF);

3. Copy palette

Assign a new index<strong class="keylink"> to each color in the destination image using the </strong>imagecolORMatch function.

for ($i = 0; $i < imagesy($srcImage); $i ) {
for ($j = 0; $j < imagesx($srcImage); $j ) {
$srcColor = imagecolorat($srcImage, $j, $i);
$dstColor = imagecolormatch($dstImage, $srcColor);
imagesetpixel($dstImage, $j, $i, $dstColor);
}
}

4. Apply the source image’s palette to the target image

imagepalettecopy($dstImage, $palette);

5. Save the target image

imagejpeg($dstImage, "destination.jpg");

Sample code:

$srcImage = imagecreatefromjpeg("source.jpg");
$dstImage = imagecreate(500, 300);
$palette = imagecreatetruecolor(256, 1);
imagefilledrectangle($palette, 0, 0, 255, 1, 0xFFFFFF);

for ($i = 0; $i < imagesy($srcImage); $i ) {
for ($j = 0; $j < imagesx($srcImage); $j ) {
$srcColor = imagecolorat($srcImage, $j, $i);
$dstColor = imagecolormatch($dstImage, $srcColor);
imagesetpixel($dstImage, $j, $i, $dstColor);
}
}

imagepalettecopy($dstImage, $palette);
imagejpeg($dstImage, "destination.jpg");

By following these steps, you can easily copy a color palette from one image to another, maintaining color accuracy in the destination image.

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