使用imagecreatetruecolor和imagecreatefromjpeg不是真正的颜色

Question

Hy there,

I use this code to resize my images to improve size...

<?php
    // File
    $filename = 'ok.jpg';
    list($width, $height) = getimagesize($filename);
    $ratio = ($width >= $height) ? 683 : 1152;
    $percent = $ratio / $height;

    // New sizes
    $new_width = $width * $percent;
    $new_height = $height * $percent;

    // Apply new sizes
    $image_p = imagecreatetruecolor($new_width, $new_height);
    $image = imagecreatefromjpeg($filename);
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

    // Save
    imagejpeg($image_p, 'tes.jpg', 80);
    imagedestroy($image);
    imagedestroy($image_p);

But I saw a problem with the colors quality... image looks more grey than original.

Original picture :

And after resizing :

What can I do to keep same colors ? Thanks