i want to make my image size as my given size when it upload.
my php code
$picture_name =time().'-' .$_FILES["picture"]["name"];
if($c->Insert())
{
move_uploaded_file($_FILES["picture"]["tmp_name"], "Portfolio_Image/" . $picture_name);
}
But how can i re-size image at upload time
Take a look at the PHP GD library. In particular the imagecopyresized function. The example on there is a pretty good one.
Related
I am making an avatar script from scratch and am having some problems. I got transparency working, and multi-image support for heads, bodies, shirts, etc.
Anyhow, I want to be able to generate specific sizes of the avatar within the PHP script. At this time, I have the variable $baseImage, which is an image generated using the GD script below:
$baseImage = imagecreatefrompng($startAsset);
imagealphablending($baseImage, true);
imagesavealpha($baseImage, true);
... combine all images into $base here
header("Content-type: image/png");
imagepng($baseImage);
The size of the image this generates is 350x550 (pixels) and I want to be able to get a smaller size.
I've done research but cannot find a working solution. What built-in PHP GD functions can resize this, retain transparency, and keep the great quality/colors?
There is no way to change the size of an image resource directly. Instead, you need to create a new image of the desired size and use imagecopyresampled to copy from the fullsize image to the resized one.
I have a website where users have been uploading a bunch of high quality PNG files. I want to use PHP to convert them to JPEG and re-size them to make them smaller in file size.
How can I do this when they upload the file? What is the process for doing this? Is a new image created or is it edited?
Thanks
You can use something like this :
function pngTojpg($pngImage, $outputPngFile, $outputJpgFile, $quality) {
$image = imagecreatefrompng($pngImage);
//Save the png image
imagepng($image, $outputPngFile);
//Save the jpeg image
imagejpeg($image, $outputJpgFile, $quality);
// Free up memory
imagedestroy($image);
}
"quality is optional, and ranges from 0 (worst quality, smaller file) to 100 (best quality, biggest file). The default is the default IJG quality value (about 75)"
The php doc : imagejpeg, imagecreatefrompng
These functions are from the GD library, here the installation instruction : Php GD
Use ImageMagick to do all kinds of conversions. You should be able to find examples at this link:
http://www.php.net/manual/en/book.imagick.php
Just try ImageMagick:
http://www.imagemagick.org/script/convert.php
I think, that is what you are looking for.
Well, you can use simple php code to do that but I use and recomend this library to work with images:
Verot - Class Upload http://www.verot.net/php_class_upload.htm
You can convert images to other format, reduce size, transform and do a lot others stuffs.
I've heard that the best way to handle uploaded images is to "re-process" them using the GD library and save the processed image. see: PHP image upload security check list
My question is how do this "re-processing" in GD? What this means exactly? I don't know the GD library very well and I'm afraid I will mess it up...
So if anyone who did this before could you give me an example for this?
(I know, another other option is to use ImageMagick. For ImageMagick I found an answer here: Remove EXIF data from JPG using PHP, but I can't use ImgMagick now. By the way.. removing EXIF data means completely recreate the image in this case?)
(I'm using Zend Framework if someone interested.)
If the user uploads a JPEG file, you could do something like this to reprocess it:
$newIm = #imagecreatefromjpeg($_FILES['file']['tmp_name']);
if (!$newIm) {
// gd could not create an image from the source
// most likely, the file was not a valid jpeg image
}
You could then discard the $newIm image using imagedestroy() and use the uploaded file from the user, or save out the image from GD and use that. There could be some issues with saving the GD image as it is not the original image.
Another simple method would be to check the header (first several bytes) of the image file to make sure it is correct; for example all JPEG files begin with 0xff 0xd8.
See also imagecreatefromstring(), and you can also use getimagesize() to run similar checks on the uploaded image.
function isvalidjpeg($file)
{
$finfo = finfo_open(FILEINFO_MIME_TYPE);
return is_resource($finfo) &&
(finfo_file($finfo, $file) === 'image/jpeg') &&
finfo_close($finfo);
}
if(isvalidjpeg($_FILES['file']['tmp_name'])) {
$newIm = #imagecreatefromjpeg($_FILES['file']['tmp_name']); .....
I have a php script that will receive a bunch of images uploaded.
What I need to do is create a small thumbnail of each, on the fly using imagemagick.
I can do that easy enough but I also need to crop it so that the thumbnail is always 100x100.
the images supplied won't be the same proportions so simply downsizing won't work.
Can I downsize, crop to 100x100 and save to jpeg all in one step?
I believe this should do what you want:
convert 'just_uploaded/*' -resize 100x100^ -gravity center -extent 100x100 -set filename:f '%t' +adjoin 'just_uploaded_thumbs/%[filename:f].jpg'
resize will downsize, extent (in combination with gravity) will crop, and the rest takes care of saving with a modified name, in JPEG format, in a different directory.
Short answer: no. That'll be 3 steps, no less.
Longer answer: you can do it using the command line interface. In PHP, the only way is to write a function that will do what you ask. Then, for each image, you can just call your function. I'm not sure how this is more beneficial than just using the 3 Imagick functions separately...
I like the sfThumbnailPlugin. It wraps around both ImageMagick or GD
http://www.symfony-project.org/plugins/sfThumbnailPlugin
Example:
public function executeUpload()
{
// Retrieve the name of the uploaded file
$fileName = $this->getRequest()->getFileName('file');
// Create the thumbnail
$thumbnail = new sfThumbnail(150, 150);
$thumbnail->loadFile($this->getRequest()->getFilePath('file'));
$thumbnail->save(sfConfig::get('sf_upload_dir').'/thumbnail/'.$fileName, 'image/png');
// Move the uploaded file to the 'uploads' directory
$this->getRequest()->moveFile('file', sfConfig::get('sf_upload_dir').'/'.$fileName);
// Do whatever is next
$this->redirect('media/show?filename='.$fileName);
}
I am working on building gallery where the user uploads all the images. I had tried to use GD originally but found that it used way too much memory when dealing with images from a digital camera. So I have been looking into ImageMagick and ran into this problem.
My end goal is to resize the image and then upload it. I am not sure if this is possible with ImageMagick or not. I have gotten it to resize the image after upload but it doesn't save the resized image, just the original size.
This is the code I am currently using: ($image is the path to the file on my server)
$resource = NewMagickWand();
MagickReadImage($resource,$image);
MagickSetImageCompressionQuality( $resource, 100);
$resource = MagickTransformImage($resource,'0x0','660x500');
Any input would be appreciated,
Levi
Your code will send the modified image to the client (the web browser), but it will not save it to the server (replacing the original image, for example)
To save the image, use:
MagickWriteImage( $resource, 'new_image.jpg' );