要修剪所有空白，就像您所说的那样，围绕图像的有趣部分，首先我们找出“空白”在哪里停止，然后我们复制这些边界内的所有内容。
//load the image$img = imagecreatefromjpeg("http://ecx.images-amazon.com/images/I/413XvF0yukL._SL500_AA280_.jpg");//find the size of the borders$b_top = 0;$b_btm = 0;$b_lft = 0;$b_rt = 0;//topfor(; $b_top < imagesy($img); ++$b_top) { for($x = 0; $x < imagesx($img); ++$x) { if(imagecolorat($img, $x, $b_top) != 0xFFFFFF) { break 2; //out of the 'top' loop } }}//bottomfor(; $b_btm < imagesy($img); ++$b_btm) { for($x = 0; $x < imagesx($img); ++$x) { if(imagecolorat($img, $x, imagesy($img) - $b_btm-1) != 0xFFFFFF) { break 2; //out of the 'bottom' loop } }}//leftfor(; $b_lft < imagesx($img); ++$b_lft) { for($y = 0; $y < imagesy($img); ++$y) { if(imagecolorat($img, $b_lft, $y) != 0xFFFFFF) { break 2; //out of the 'left' loop } }}//rightfor(; $b_rt < imagesx($img); ++$b_rt) { for($y = 0; $y < imagesy($img); ++$y) { if(imagecolorat($img, imagesx($img) - $b_rt-1, $y) != 0xFFFFFF) { break 2; //out of the 'right' loop } }}//copy the contents, excluding the border$newimg = imagecreatetruecolor( imagesx($img)-($b_lft+$b_rt), imagesy($img)-($b_top+$b_btm));imagecopy($newimg, $img, 0, 0, $b_lft, $b_top, imagesx($newimg), imagesy($newimg));//finally, output the imageheader("Content-Type: image/jpeg");imagejpeg($newimg);我的旧示例假设图像的所有侧面都具有相同的“边框”，只是为了澄清注释：）
//load the image$img = imagecreatefromjpeg("img.jpg");//find the size of the border.$border = 0;while(imagecolorat($img, $border, $border) == 0xFFFFFF) { $border++;}//copy the contents, excluding the border//This pre assumes that the border is the same size on all sides of the image.$newimg = imagecreatetruecolor(imagesx($img)-($border*2), imagesy($img)-($border*2));imagecopy($newimg, $img, 0, 0, $border, $border, imagesx($newimg), imagesy($newimg));//finally, if you want, overwrite the original imageimagejpeg($newimg, "img.jpg");
