gd

问题 I'm trying to create a Thumbnail Generator in PHP with GD that will take an image and reduce it to a fixed width/height. The square it takes from the original image (based on my fixed width/height) will come from the center of the image to give a proportionally correct thumbnail. I'll try to demonstrate that confusing sentence with some nice ASCII :} LANDSCAPE EXAMPLE: XXXXXXXXXXXXXXXX XXXXOOOOOOOOXXXX XXXXOOOOOOOOXXXX XXXXOOOOOOOOXXXX XXXXOOOOOOOOXXXX XXXXXXXXXXXXXXXX XXXXXXXX XXXXXXXX

问题 I am using this code to create an image <?php // Set the content-type header('Content-Type: image/png'); // Create the image $im = imagecreatetruecolor(400, 30); // Create some colors $white = imagecolorallocate($im, 255, 255, 255); $grey = imagecolorallocate($im, 128, 128, 128); $black = imagecolorallocate($im, 0, 0, 0); imagefilledrectangle($im, 0, 0, 399, 29, $white); // The text to draw $text = 'Testing...'; // Replace path by your own font path $font = 'arial.ttf'; // Add some shadow to

问题 What can cause php gd to produce a black image after resizing? The following code always outputs a black image for every valid jpeg file. <?php $filename = 'test.jpg'; $percent = 0.5; header('Content-Type: image/jpeg'); list($width, $height) = getimagesize($filename); $newwidth = $width * $percent; $newheight = $height * $percent; $thumb = imagecreatetruecolor($newwidth, $newheight); $source = imagecreatefromjpeg($filename); imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight,

问题 I'm using GD to resize and convert images, however during my tests I found a weird behavior when converting transparent PNG's to JPEG's. According to the manual ImageAlphaBlending() is on by default but in order to preserve the transparency I must set ImageSaveAlpha() to true (which in turn requires that I set ImageAlphaBlending() to false). So the correct way should be: $result = ImageCreateFromPNG(...); ImageAlphaBlending($result, false); ImageSaveAlpha($result, true); ImageFill($result, 0,

问题 I am running running a script which moves an uploaded file with move_uploaded_file() . I have done this thousands of times but for some reason it's not working. I have confimred the following: <form> using method="post" and correct enctype correct file referenced from form directory has permissions 777 all the memory_limit , max_execution_time , etc are set to super high settings to avoid timeouts Basically, the script below returns with just Your image is too big. . I have also enabled ALL

问题 The final output should be like image(HELLO WORLD): Here is what i am doing:- $im = imagecreate(400,400); $txtcol = imagecolorallocate($im, 0xFF, 0x00, 0x00); $size = 20; $txt = 'DUMMY TEXT'; $font = './font/Capriola-Regular.ttf'; /*two points for base line*/ $x1 = 50; $x2 = 300; $y1 = 150; $y2 = 170; /*bof finding line angle*/ $delta_x = $x2-$x1; $delta_y = $y2-$y1; $texangle = (rad2deg(atan2($delta_y,$delta_x)) * 180 / M_PI)-360; /*eof finding the line angle*/ imageline($im,$x1,$y1,$x2,$y2,

问题 I'm looking for a finshed solution or possibly some math/algorithms for creating a big image collage out of smaller product pictures? I know how to do it in a square fashion, from same sized pictures with gd/imagemagick but I'd like to have some variation built in. For example, some of the pictures might be slightly taller, and if all are the same size and square - i might want 1 of them take up more space, just to mix up the design. keeping it interesting. the more i think about this the

问题 I would like to create a picture in PHP with GD composed by different other pictures. For example I have 6 pictures (or more) and I would like to create ONE picture who contain these different pictures. The Difficulty is that my final picture must have a fixed width and height (304x179), so if the different pictures are too big they must be cut. This is an example from IconFinder : This picture is composed by 6 images, but the 3rd bird (green) is cutted, and the 4, 5 and 6 are cutted in the

问题 How does one enable (or perhaps I need to install) GD when my phpinfo() output in "Configure Command" says; --without-gd ? I also have nothing in my phpinfo() output "Core" that lists "gd" PHP Version 5.2.4 on AWS. 回答1: if you are on a Debian based server (such as Ubuntu) you can run the following command: apt-get install php5-gd Then once it is complete run: /etc/init.d/apache2 restart This will restart your server and enable GD in PHP. If you are on another type of system you will need to

问题 I have a lot of JPEG images that I want to convert to PNG images using PHP. The JPEGs are going to be uploaded by clients so I can't trust them to make sure they are in the right format. I also want to make their white backgrounds transparent. Does PHP have any functions I can use to achieve this? 回答1: After a few days of trying different solutions and doing some more research, this is what I found worked for me. $image = imagecreatefromjpeg( 'image.jpg' ); imagealphablending($image, true);