使用 PHP 脚本调整大小后照片颜色错误

Question

我正在使用以下 PHP 函数调整大图像的大小以适应 500 像素宽度：

<?php
function resizeImage($name) {
header('Content-type: image/jpeg');
$filename = "file.jpg";
$new_width = 500;
list($width, $height) = getimagesize($filename);
$new_height = (($height*$new_width)/$width);
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
imagejpeg($image_p, "file.jpg", 100);
}
?>

由于某种原因，调整后的图片颜色与之前不完全相同。它们不像以前那样清晰和强大。如您所见[图片已删除]，左侧（原始）照片中有更多的红色和亮度。

为什么？我的脚本有问题吗？还是正常的缩放效果？

Answer 1

这是我现在的工作代码：

<?php
// Call the function with: resizeImage("INSERT_YOUR_FILE_NAME_INCLUDING_SUFFIX_HERE");
function resizeImage($file_name) {

// File is located at: files/original/
$filename = "files/original/".$file_name;

// The width you want the converted image has
$new_width = 500;

// Calculate right height
list($width, $height) = getimagesize($filename);
$new_height = (($height*$new_width)/$width);

// Get image
$small = new Imagick($filename);

// Resize image, but only if original image is wider what the wanted 500 px
if($width > $new_width) {$small->resizeImage($new_width, $new_height, Imagick::FILTER_LANCZOS, 1);}

// Some code to correct the color profile
$version = $small->getVersion();
$profile = "sRGB_IEC61966-2-1_no_black_scaling.icc";
if((is_array($version) === true) && (array_key_exists("versionString", $version) === true)) {$version = preg_replace("~ImageMagick ([^-]*).*~", "", $version["versionString"]);if(is_file(sprintf("/usr/share/ImageMagick-%s/config/sRGB.icm", $version)) === true) {$profile = sprintf("/usr/share/ImageMagick-%s/config/sRGB.icm", $version);}}if(($srgb = file_get_contents($profile)) !== false){$small->profileImage("icc", $srgb);$small->setImageColorSpace(Imagick::COLORSPACE_SRGB);}

// Safe the image to: files/small/
$small->writeImage("files/small/".$file_name);

// Clear all resources associated to the Imagick object
$small->clear();
}
?>

不要忘记从 http://www.color.org/sRGB_IEC61966-2-1_no_black_scaling.icc 下载 icc 文件并将其保存在与调整大小文件相同的目录中，或者将 $profile = "sRGB_IEC61966-2-1_no_black_scaling.icc"; 更改为 $profile = "http://www.color.org/sRGB_IEC61966-2-1_no_black_scaling.icc";！

使用 PHP 脚本调整大小后照片颜色错误

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