Php 一些图像/GD问题:裁剪、设置颜色和透明度
我在Ubuntu机器(PHP5.5.9)上编写了一些使用GD的PHP代码,并将其转移到使用amazon Linux(PHP5.5.31)的amazon EC2上,我从相同的输入数据文件(我只使用Php 一些图像/GD问题:裁剪、设置颜色和透明度,php,gd,Php,Gd,我在Ubuntu机器(PHP5.5.9)上编写了一些使用GD的PHP代码,并将其转移到使用amazon Linux(PHP5.5.31)的amazon EC2上,我从相同的输入数据文件(我只使用imagecreatefromstring();$data包含JPEG文件的内容)中得到了完全不同的结果 在我更换机器之前,它会将白色变为透明。它不再带来这种变化 它过去常常完美地裁剪图形。现在它在左边留下一点白色,在右边剪掉一点图像 左边有一条细黑线 我甚至无法使用imagecolorset()使图像改
imagecreatefromstring()
;$data
包含JPEG文件的内容)中得到了完全不同的结果
imagecolorset()
使图像改变颜色if ($isFileString) {
$src2 = imagecreatefromstring($data);
} else {
$src2 = imagecreatefromjpeg($data);
}
// This was an attempt to get it to recognize transparent.
if (!unlink ("../drive/sigs/tmp.png"))
die("Failed to delete tmp.png");
imagepng($src2, "../drive/sigs/tmp.png");
imagedestroy($src2);
$src = imagecreatefrompng("../drive/sigs/tmp.png");
imagealphablending($src, false);
imagesavealpha($src, true);
for ($i=0; $i< 1024; $i++) {
echo $i;
echo print_r(imagecolorsforindex($src, $i));
imagecolorset($src, $i, 255, 255, 255,255);
echo print_r(imagecolorsforindex($src, $i));
echo "<BR>";
}
$src = imagecropauto($src, IMG_CROP_WHITE);
$white = imagecolorallocate($src, 255, 255, 255);
imagecolortransparent($src, $white);
$src = imagerotate($src, -90, 0);
EDIT2
更多信息:我检查了gd版本(php-I | grep-I gd
)。我很惊讶地看到带有GD版本2.1.1-dev的Ubuntu盒和带有“捆绑(2.1.0兼容)”的EC2盒。我是GD新手,所以我更倾向于相信这是我的错,而不是亚马逊提供了一个糟糕的GD版本
EDIT3
- 这似乎不是内存问题。
报告的内存约为35MBmemory\u get\u peak\u usage()
报告的唯一区别是版本号gd_info()
if ($isFileString) {
$im1 = imagecreatefromstring($data);
} else {
$im1 = imagecreatefromjpeg($data);
}
$tmp_file = $this->tmp_dir . md5(time() . mt_rand());
imagepng($im1, $tmp_file);
imagedestroy($im1);
// rotate, pre-resize and resample the source image
$im2 = imagecreatefrompng($tmp_file);
unlink($tmp_file);
if (imagesy($im2) > imagesx($im2))
$im2 = imagerotate($im2, $this->rotate, 0);
$width = imagesx($im2);
$height = imagesy($im2);
$percent = ($this->standard_width * 2) / $width;
$newWidth = $width * $percent;
$newHeight = $height * $percent;
$im = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($im, $im2, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
// create a transparent image with a size like $im image
$im3 = imagecreatetruecolor($newWidth, $newHeight);
imagesavealpha($im3, TRUE);
imagefill($im3, 0, 0, imagecolorallocatealpha($im3, 0, 0, 0, 127));
// find non-white-ish pixels on $im and copy them to $dst
$sizeX = $newWidth;
$sizeY = $newHeight;
$startX = $startY = 100000;
$finishX = $finishY = 0;
for ($x = 1; $x < $sizeX - 1; $x++) {
for ($y = 1; $y < $sizeY - 1; $y++) {
$rgb = imagecolorat($im, $x, $y);
$colors = imagecolorsforindex($im, $rgb);
$r = $colors['red'];
$g = $colors['green'];
$b = $colors['blue'];
if ($r < $this->redLimit && $g < $this->greenLimit && $b < $this->blueLimit) {
imagesetpixel($im3, $x, $y, $rgb);
if ($startX > $x) {
$startX = $x;
}
if ($startY > $y) {
$startY = $y;
}
if ($finishX < $x)
$finishX = $x;
if ($finishY < $y)
$finishY = $y;
}
}
}
// final resize
$width = $finishX - $startX + 1;
$height = $finishY - $startY + 1;
$percent = $this->standard_width / $width;
$newWidth = $width * $percent;
$newHeight = $height * $percent;
$im4 = imagecreatetruecolor($newWidth, $newHeight);
imagesavealpha($im4, TRUE);
imagefill($im4, 0, 0, imagecolorallocatealpha($im4, 0, 0, 0, 127));
imagecopyresampled($im4, $im3, 0, 0, $startX, $startY, $newWidth, $newHeight, $width, $height);
// returning image
ob_start();
imagepng($im4);
$image_data = ob_get_contents();
ob_end_clean();
return $image_data;
if($isFileString){
$im1=imagecreatefromstring($data);
}否则{
$im1=imagecreatefromjpeg($data);
}
$tmp_file=$this->tmp_dir。md5(time().mt_rand());
imagepng($im1,$tmp_文件);
国际货币基金组织(1美元);
//对源图像进行旋转、预调整大小和重采样
$im2=imagecreatefrompng($tmp_文件);
取消链接($tmp_文件);
if(imagesy($im2)>imagesx($im2))
$im2=imagerotate($im2,$this->rotate,0);
$width=imagesx($im2);
$height=imagesy($im2);
$percent=($this->standard_width*2)/$width;
$newWidth=$width*$percent;
$newHeight=$height*$percent;
$im=ImageCreateTureColor($newWidth,$newHeight);
imagecopyresampled($im、$im2、0、0、0、0、$newWidth、$newHeight、$width、$height);
//创建一个大小类似$im image的透明图像
$im3=ImageCreateTureColor($newWidth,$newHeight);
imagesavealpha($im3,TRUE);
imagefill($im3,0,0,imagecolorallocatealpha($im3,0,0,0127));
//在$im上查找非白色像素并将其复制到$dst
$sizeX=$newWidth;
$sizeY=$newHeight;
$startX=$startY=100000;
$finishX=$finishY=0;
对于($x=1;$x<$sizeX-1;$x++){
对于($y=1;$y<$sizeY-1;$y++){
$rgb=imagecolorat($im,$x,$y);
$colors=imagecolorsforindex($im,$rgb);
$r=$colors['red'];
$g=$colors['green'];
$b=$colors['blue'];
如果($r<$this->redLimit&&$g<$this->greenLimit&&$b<$this->blueLimit){
imagesetpixel($im3,$x,$y,$rgb);
如果($startX>$x){
$startX=$x;
}
如果($startY>$y){
$startY=$y;
}
如果($finishX<$x)
$finishX=$x;
如果($finishY<$y)
$finishY=$y;
}
}
}
//最终调整大小
$width=$finishX-$startX+1;
$height=$finishY-$startY+1;
$percent=$this->standard_width/$width;
$newWidth=$width*$percent;
$newHeight=$height*$percent;
$im4=ImageCreateTureColor($newWidth,$newHeight);
imagesavealpha($im4,TRUE);
imagefill($im4,0,0,imagecolorallocatealpha($im4,0,0,0127));
imagecopyresampled($im4、$im3、0、0、$startX、$startY、$newWidth、$newHeight、$width、$height);
//返回图像
ob_start();
图像PNG(每平方米4美元);
$image_data=ob_get_contents();
ob_end_clean();
返回$image\u数据;
if ($isFileString) {
$im1 = imagecreatefromstring($data);
} else {
$im1 = imagecreatefromjpeg($data);
}
$tmp_file = $this->tmp_dir . md5(time() . mt_rand());
imagepng($im1, $tmp_file);
imagedestroy($im1);
// rotate, pre-resize and resample the source image
$im2 = imagecreatefrompng($tmp_file);
unlink($tmp_file);
if (imagesy($im2) > imagesx($im2))
$im2 = imagerotate($im2, $this->rotate, 0);
$width = imagesx($im2);
$height = imagesy($im2);
$percent = ($this->standard_width * 2) / $width;
$newWidth = $width * $percent;
$newHeight = $height * $percent;
$im = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresampled($im, $im2, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
// create a transparent image with a size like $im image
$im3 = imagecreatetruecolor($newWidth, $newHeight);
imagesavealpha($im3, TRUE);
imagefill($im3, 0, 0, imagecolorallocatealpha($im3, 0, 0, 0, 127));
// find non-white-ish pixels on $im and copy them to $dst
$sizeX = $newWidth;
$sizeY = $newHeight;
$startX = $startY = 100000;
$finishX = $finishY = 0;
for ($x = 1; $x < $sizeX - 1; $x++) {
for ($y = 1; $y < $sizeY - 1; $y++) {
$rgb = imagecolorat($im, $x, $y);
$colors = imagecolorsforindex($im, $rgb);
$r = $colors['red'];
$g = $colors['green'];
$b = $colors['blue'];
if ($r < $this->redLimit && $g < $this->greenLimit && $b < $this->blueLimit) {
imagesetpixel($im3, $x, $y, $rgb);
if ($startX > $x) {
$startX = $x;
}
if ($startY > $y) {
$startY = $y;
}
if ($finishX < $x)
$finishX = $x;
if ($finishY < $y)
$finishY = $y;
}
}
}
// final resize
$width = $finishX - $startX + 1;
$height = $finishY - $startY + 1;
$percent = $this->standard_width / $width;
$newWidth = $width * $percent;
$newHeight = $height * $percent;
$im4 = imagecreatetruecolor($newWidth, $newHeight);
imagesavealpha($im4, TRUE);
imagefill($im4, 0, 0, imagecolorallocatealpha($im4, 0, 0, 0, 127));
imagecopyresampled($im4, $im3, 0, 0, $startX, $startY, $newWidth, $newHeight, $width, $height);
// returning image
ob_start();
imagepng($im4);
$image_data = ob_get_contents();
ob_end_clean();
return $image_data;