我如何使用php imagefilter创建jpg图像矢量图像

Question

请帮助我创建像下面这样的矢量图像，我尝试使用图像过滤器灰度，但是它不是创建我想要的暗黑色，所以如果你能帮助我在PHP中创建像这样的暗黑色矢量，那将是伟大的。

这是我之前尝试过的代码，它创建了一个矢量，但它是灰色的，而不是黑色的

from this image

形象

我的代码是

if($effect){
imagefilter($dst_img, IMG_FILTER_GRAYSCALE);


//imagefilter($dst_img, IMG_FILTER_CONTRAST, -100);
}

我的完整代码是

function createThumbnail($imageName,$newWidth,$newHeight,$effect)
{
$uploadDir="assets/front/collage/images/9fd0c8fe";
$path = $uploadDir . '/' . $imageName;
$mime = getimagesize($path);
if($mime['mime']=='image/png'){ $src_img = imagecreatefrompng($path); }
if($mime['mime']=='image/jpg'){ $src_img = imagecreatefromjpeg($path); }
if($mime['mime']=='image/jpeg'){ $src_img = imagecreatefromjpeg($path); }
if($mime['mime']=='image/pjpeg'){ $src_img = imagecreatefromjpeg($path); }
$old_x = imageSX($src_img);
$old_y = imageSY($src_img);
if($old_x > $old_y)
{
$thumb_w    =   $newWidth;
$thumb_h    =   $old_y/$old_x*$newWidth;
}
if($old_x < $old_y)
{
$thumb_w    =   $old_x/$old_y*$newHeight;
$thumb_h    =   $newHeight;
}
if($old_x == $old_y)
{
$thumb_w    =   $newWidth;
$thumb_h    =   $newHeight;
}

$dst_img        =   ImageCreateTrueColor($thumb_w,$thumb_h);
imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);
if($effect){
imagefilter($dst_img, IMG_FILTER_GRAYSCALE);


//imagefilter($dst_img, IMG_FILTER_CONTRAST, -100);
}
// New save location
//$new_thumb_loc = $moveToDir . $imageName;
if($mime['mime']=='image/png'){ $result = imagepng($dst_img); }
if($mime['mime']=='image/jpg'){ $result = imagejpeg($dst_img); }
if($mime['mime']=='image/jpeg'){ $result = imagejpeg($dst_img); }
if($mime['mime']=='image/pjpeg'){ $result = imagejpeg($dst_img); }


imagedestroy($dst_img);
imagedestroy($src_img);
return $result;
}

Answer 1

这对我有用:

<?php
createThumbnail('test.png',50,50,true);
function createThumbnail($imageName,$newWidth,$newHeight,$effect)
{
$uploadDir="assets/front/collage/images/9fd0c8fe";
$path = $uploadDir . '/' . $imageName;
$mime = getimagesize($path);
if($mime['mime']=='image/png'){ $src_img = imagecreatefrompng($path); }
if($mime['mime']=='image/jpg'){ $src_img = imagecreatefromjpeg($path); }
if($mime['mime']=='image/jpeg'){ $src_img = imagecreatefromjpeg($path); }
if($mime['mime']=='image/pjpeg'){ $src_img = imagecreatefromjpeg($path); }
$old_x = imagesx($src_img);
$old_y = imagesy($src_img);
if($old_x > $old_y)
{
$thumb_w    =   $newWidth;
$thumb_h    =   $old_y/$old_x*$newWidth;
}
if($old_x < $old_y)
{
$thumb_w    =   $old_x/$old_y*$newHeight;
$thumb_h    =   $newHeight;
}
if($old_x == $old_y)
{
$thumb_w    =   $newWidth;
$thumb_h    =   $newHeight;
}

$dst_img        =   imagecreatetruecolor($thumb_w,$thumb_h);

imagecopyresampled($dst_img,$src_img,0,0,0,0,$thumb_w,$thumb_h,$old_x,$old_y);

if($effect){
imagefilter($dst_img, IMG_FILTER_GRAYSCALE);
imagefilter($dst_img, IMG_FILTER_CONTRAST, -100);

}
// New save location
//$new_thumb_loc = $moveToDir . $imageName;
header('Content-Type: ' . $mime['mime']); //Changed for my test
if($mime['mime']=='image/png'){ $result = imagepng($dst_img); }
if($mime['mime']=='image/jpg'){ $result = imagejpeg($dst_img); }
if($mime['mime']=='image/jpeg'){ $result = imagejpeg($dst_img); }
if($mime['mime']=='image/pjpeg'){ $result = imagejpeg($dst_img); }
return $result;
}