我创建了一个函数，它根据参数以不同的方式处理图像。我在函数中有注释来解释一下。
当我拍摄jpg图像并将其保存为png时，一切都可以工作。我只是检查，即使我使用imagepng()，但保存它的扩展名。jpg，图像显示，而适当调整大小，但与。jpg扩展。但是，如果我上传相同的。jpg图像，使用imagepng()并将其保存为。png扩展名，则在调整大小后，我将获得期望宽度和高度的图像，以png格式，扩展名为。png。虽然整个图片是100%透明的，但我在左上角设置了一个1px * 1px的黑色像素
如果有人能看看这个，看看他们是否看到我错过了什么，我会很感激的。我相信1px X 1px来自我用于imagefill()的点，但我不明白为什么;它应该像图片的其他部分一样全透明。
下面是我的函数:
if(!function_exists("upload")){
//$image = $image file name
//$width = intended width of resized image, if 0 it will proportion to height, overrides proportion
//$height = intended width of resized image, if 0 it will proportion to width, overrides proportion
//$proportion = 2,1,0;
//------ 2 = Preserve proportions while adding a border to fill width and height
//------ 1 = retain proportion to fit within both given width and height
//------ 0 = disregard proportions and resize to the exact width and height
function upload($image, $width, $height, $proportion){
// IS GD HERE?
$gdv = get_gd_info();
if (!$gdv){
return FALSE;
}
// GET AN IMAGE THING
$ext = trim(strtolower(end(explode('.', $image))));
list($imageX, $imageY, $type) = getimagesize($image); //gets information about new server image
// GET THE LESSER OF THE RATIO OF THUMBNAIL H OR W DIMENSIONS
$ratio_w = ($width / $imageX);
$ratio_h = ($height / $imageY);
$ratio = ($ratio_w < $ratio_h) ? $ratio_w : $ratio_h;
if($width == 0){
if($imageY > $height){
$newHeight = $height;
$newWidth = ($height/$imageY) * $imageX;
}else{
$newHeight = $imageY;
$newWidth = $imageX;
}
$width = $newWidth;
$height = $newHeight;
// COMPUTE THUMBNAIL IMAGE CENTERING OFFSETS
$fromMidX = 0;
$fromMidY = 0;
}elseif($height == 0){
if ($imageX > $width){
$newWidth = $width;
$newHeight = ($width/$imageX) * $imageY;
}else{
$newHeight = $imageY;
$newWidth = $imageX;
}
$width = $newWidth;
$height = $newHeight;
// COMPUTE THUMBNAIL IMAGE CENTERING OFFSETS
$fromMidX = 0;
$fromMidY = 0;
}elseif($proportion == 2){
// COMPUTE THUMBNAIL IMAGE DIMENSIONS
$newWidth = $imageX * $ratio;
$newHeight = $imageY * $ratio;
// COMPUTE THUMBNAIL IMAGE CENTERING OFFSETS
$fromMidX = ($width - $newWidth) / 2.0;
$fromMidY = ($height - $newHeight) / 2.0;
}elseif($proportion == 1){
if ($imageX > $width){
$newHeight = ($width/$imageX) * $imageY;
$newWidth = $width;
}
if ($imageY > $height){
$newHeight = $height;
$newWidth = ($height/$imageY) * $imageX;
}
$fromMidY = 0;
$fromMidX = 0;
}elseif($proportion == 0){
$newWidth = $width;
$newHeight = $height;
$fromMidY = 0;
$fromMidX = 0;
}
switch(strtoupper($ext))
{
case 'JPG' :
case 'JPEG' :
$source = imagecreatefromjpeg($image);
break;
case 'PNG' :
$source = imagecreatefrompng($image);
break;
default : die("UNKNOWN IMAGE TYPE: $image");
}
// WHICH FUNCTIONS CAN RESIZE / RESAMPLE THE IMAGE?
if ($gdv >= 2)
{
// IF GD IS AT LEVEL 2 OR ABOVE
$target = imagecreatetruecolor($width, $height);
$color = imagecolorallocatealpha($target, 0, 0, 0, 127);
imagefill($target, 0, 0, $color);
imagesavealpha($target, TRUE);
imagecopyresampled ($target, $source, $fromMidX, $fromMidY, 0, 0, $newWidth, $newHeight, $imageX, $imageY);
}
else
{
// IF GD IS AT A LOWER REVISION LEVEL
$target = imagecreate($width, $height);
imagesavealpha($target, TRUE);
$empty = imagecolorallocatealpha($thumb,0x00,0x00,0x00,127);
imagefill($target, 0, 0, $empty);
imagecopyresized($target, $source, $fromMidX, $fromMidY, 0, 0, $newWidth, $newHeight, $imageX, $imageY);
}
// SHARPEN THE PIC
$sharpenMatrix = array
( array( -1.2, -1, -1.2 )
, array( -1, 20, -1 )
, array( -1.2, -1, -1.2 )
)
;
$divisor = array_sum(array_map('array_sum', $sharpenMatrix));
$offset = 0;
imageconvolution($target, $sharpenMatrix, $divisor, $offset);
if(imagepng($target, $image,9)){
imagedestroy($target);
}else{
}
return $image;
}
}
编辑1:我想我应该注意到，我正在上传一个。jpg图像(例如:100px X 200px)并将它们转换为。png(例如:400px X 200px)，但我保留了图像的比例，以完美地适应目标。png的中心。所以我要有一个400px X 200px的。png，中间是我的图像，左右是100px，应该是透明的。这样，它就可以很好地适应滑动条，而不需要纯色填充。因此，我调用我的函数的一个例子是upload($image, 400, 200, 2)。
我知道问题出在哪里了。决定我是否应该使用imagecreatefromjpeg或imagecreatefrompng的代码部分错误地离开了传递的图像的扩展，而不是通过其mime类型。我把它改成了:
switch($type)
{
case '2' :
$source = imagecreatefromjpeg($image);
break;
case '3' :
$source = imagecreatefrompng($image);
break;
default : die("UNKNOWN IMAGE TYPE: $image");
}
其中$type来自我刚才写的那行
list($imageX, $imageY, $type) = getimagesize($image);
所以整个函数是:
if(!function_exists("upload")){
//$image = $image file name
//$width = intended width of resized image, if 0 it will proportion to height, overrides proportion
//$height = intended width of resized image, if 0 it will proportion to width, overrides proportion
//$proportion = 2,1,0;
//------ 2 = Preserve proportions while adding a border to fill width and height
//------ 1 = retain proportion to fit within both given width and height
//------ 0 = disregard proportions and resize to the exact width and height
function upload($image, $width, $height, $proportion){
// IS GD HERE?
$gdv = get_gd_info();
if (!$gdv){
return FALSE;
}
// GET AN IMAGE THING
$ext = trim(strtolower(end(explode('.', $image))));
list($imageX, $imageY, $type) = getimagesize($image); //gets information about new server image
// GET THE LESSER OF THE RATIO OF THUMBNAIL H OR W DIMENSIONS
$ratio_w = ($width / $imageX);
$ratio_h = ($height / $imageY);
$ratio = ($ratio_w < $ratio_h) ? $ratio_w : $ratio_h;
if($width == 0){
if($imageY > $height){
$newHeight = $height;
$newWidth = ($height/$imageY) * $imageX;
}else{
$newHeight = $imageY;
$newWidth = $imageX;
}
$width = $newWidth;
$height = $newHeight;
// COMPUTE THUMBNAIL IMAGE CENTERING OFFSETS
$fromMidX = 0;
$fromMidY = 0;
}elseif($height == 0){
if ($imageX > $width){
$newWidth = $width;
$newHeight = ($width/$imageX) * $imageY;
}else{
$newHeight = $imageY;
$newWidth = $imageX;
}
$width = $newWidth;
$height = $newHeight;
// COMPUTE THUMBNAIL IMAGE CENTERING OFFSETS
$fromMidX = 0;
$fromMidY = 0;
}elseif($proportion == 2){
// COMPUTE THUMBNAIL IMAGE DIMENSIONS
$newWidth = $imageX * $ratio;
$newHeight = $imageY * $ratio;
// COMPUTE THUMBNAIL IMAGE CENTERING OFFSETS
$fromMidX = ($width - $newWidth) / 2.0;
$fromMidY = ($height - $newHeight) / 2.0;
}elseif($proportion == 1){
if ($imageX > $width){
$newHeight = ($width/$imageX) * $imageY;
$newWidth = $width;
}
if ($imageY > $height){
$newHeight = $height;
$newWidth = ($height/$imageY) * $imageX;
}
$fromMidY = 0;
$fromMidX = 0;
}elseif($proportion == 0){
$newWidth = $width;
$newHeight = $height;
$fromMidY = 0;
$fromMidX = 0;
}
switch($type)
{
case '2' :
$source = imagecreatefromjpeg($image);
break;
case '3' :
$source = imagecreatefrompng($image);
break;
default : die("UNKNOWN IMAGE TYPE: $image");
}
// WHICH FUNCTIONS CAN RESIZE / RESAMPLE THE IMAGE?
if ($gdv >= 2)
{
// IF GD IS AT LEVEL 2 OR ABOVE
$target = imagecreatetruecolor($width, $height);
$color = imagecolorallocatealpha($target, 0, 0, 0, 127);
imagefill($target, 0, 0, $color);
imagesavealpha($target, TRUE);
imagecopyresampled ($target, $source, $fromMidX, $fromMidY, 0, 0, $newWidth, $newHeight, $imageX, $imageY);
}
else
{
// IF GD IS AT A LOWER REVISION LEVEL
$target = imagecreate($width, $height);
imagesavealpha($target, TRUE);
$empty = imagecolorallocatealpha($thumb,0x00,0x00,0x00,127);
imagefill($target, 0, 0, $empty);
imagecopyresized($target, $source, $fromMidX, $fromMidY, 0, 0, $newWidth, $newHeight, $imageX, $imageY);
}
// SHARPEN THE PIC
$sharpenMatrix = array
( array( -1.2, -1, -1.2 )
, array( -1, 20, -1 )
, array( -1.2, -1, -1.2 )
)
;
$divisor = array_sum(array_map('array_sum', $sharpenMatrix));
$offset = 0;
imageconvolution($target, $sharpenMatrix, $divisor, $offset);
if(imagepng($target, $image,9)){
imagedestroy($target);
}
return $image;
}
}
一个示例调用将是:upload("path/to/image/on/server.png", 400, 200, 2)其中图像路径可以是jpg或png mime类型。但扩展名必须是。png。我想我可以使它更聪明的地方，你可以有任何扩展，但与当前的代码使用这个函数，它使我更有意义，让它是。我想最终添加选项来打开或关闭透明度，而不是使用纯色，如黑色，如果需要的话。请随意使用和修改它。
有很好的hex2rgb/rgb2hex函数，我计划在这里使用