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Currently, I am resizing avatars on my server using PHP's resize_crop_image. The code below takes an image, crops and resizes it so that it's exactly 500px X 500px square.
resize_crop_image(500, 500, $filename, $filename);
But I'd like to move this process from the server to the flutter app. Most of the plugins I'm seeing on pub.dev are overkill with the user cropping the image using a crop tool. But I'd like this function to happen automatically the way I currently do it in PHP.
Here's the resize_crop_image code;
function resize_crop_image($max_width, $max_height, $source_file, $dst_dir, $quality = 100){
$imgsize = getimagesize($source_file);
$width = $imgsize[0];
$height = $imgsize[1];
$mime = $imgsize['mime'];
switch($mime){
case 'image/gif':
$image_create = "imagecreatefromgif";
$image = "imagegif";
break;
case 'image/png':
$image_create = "imagecreatefrompng";
$image = "imagepng";
$quality = 10;
break;
case 'image/jpeg':
$image_create = "imagecreatefromjpeg";
$image = "imagejpeg";
$quality = 100;
break;
default:
return false;
break;
}
$dst_img = imagecreatetruecolor($max_width, $max_height);
$src_img = $image_create($source_file);
$width_new = $height * $max_width / $max_height;
$height_new = $width * $max_height / $max_width;
//if the new width is greater than the actual width of the image, then the height is too large and the rest cut off, or vice versa
if($width_new > $width){
//cut point by height
$h_point = (($height - $height_new) / 2);
//copy image
imagecopyresampled($dst_img, $src_img, 0, 0, 0, $h_point, $max_width, $max_height, $width, $height_new);
}else{
//cut point by width
$w_point = (($width - $width_new) / 2);
imagecopyresampled($dst_img, $src_img, 0, 0, $w_point, 0, $max_width, $max_height, $width_new, $height);
}
$image($dst_img, $dst_dir, $quality);
if($dst_img)imagedestroy($dst_img);
if($src_img)imagedestroy($src_img);
}
?>
You could use this library: flutter_native_image for resizing/croping your images.
Important to take a look at the other parameters of this function, you can probably customize the way the image will be cropped.
Something like that:
ImageProperties properties = await FlutterNativeImage.getImageProperties(file.path);
File croppedFile = await FlutterNativeImage.cropImage(file.path, originX, originY, 500, 500);
originX/originY: x/y position for the cut.
I'm building a wallpaper website and therefore i need to be able to resize the original image before downloading. I tried this code to resize the image:
//resize and crop image by center
function resize_crop_image($max_width, $max_height, $source_file, $dst_dir, $quality = 80){
$imgsize = getimagesize($source_file);
$width = $imgsize[0];
$height = $imgsize[1];
$mime = $imgsize['mime'];
switch($mime){
case 'image/gif':
$image_create = "imagecreatefromgif";
$image = "imagegif";
break;
case 'image/png':
$image_create = "imagecreatefrompng";
$image = "imagepng";
$quality = 7;
break;
case 'image/jpeg':
$image_create = "imagecreatefromjpeg";
$image = "imagejpeg";
$quality = 80;
break;
default:
return false;
break;
}
$dst_img = imagecreatetruecolor($max_width, $max_height);
$src_img = $image_create($source_file);
$width_new = $height * $max_width / $max_height;
$height_new = $width * $max_height / $max_width;
//if the new width is greater than the actual width of the image, then the height is too large and the rest cut off, or vice versa
if($width_new > $width){
//cut point by height
$h_point = (($height - $height_new) / 2);
//copy image
imagecopyresampled($dst_img, $src_img, 0, 0, 0, $h_point, $max_width, $max_height, $width, $height_new);
}else{
//cut point by width
$w_point = (($width - $width_new) / 2);
imagecopyresampled($dst_img, $src_img, 0, 0, $w_point, 0, $max_width, $max_height, $width_new, $height);
}
$image($dst_img, $dst_dir, $quality);
if($dst_img)imagedestroy($dst_img);
if($src_img)imagedestroy($src_img);
}
And this will do the resize:
resize_crop_image($width, $height, $image_URL, $save_URL)
This code works fine for me but i want to ONLY send the output to user's browser, since saving thousands of extra images isn't possible. There are libraries i can use, but i don't want to use a third party snippet. Is there a way to alter this code in the way i desire?
Thanks.
For your $image function , do not specify a destination directory (null) and an image stream will be created.
header("Content-type:{$mime}");
That should send the image to the user
You just need to set the proper headers and echo the output. Every PHP request "downloads a file" to the browser, more or less. You just need to specify how the browser handles it. So try something like:
header("Content-Type: $mime");
header("Content-Disposition: attachment; filename=$dst_img");
echo $dst_img;
That should do it for you.
I am trying to resize an image after uploading but the image is always converted to black. Though the image has the right dimension, it just shows black. I'm not sure where I messed up. I already searched SO to no avail.
if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $full_path)){
$orig_image = imagecreatefromjpeg($full_path);
$image_info = getimagesize($full_path);
$width_orig = $image_info[0]; // current width as found in image file
$height_orig = $image_info[1]; // current height as found in image file
if($width_orig > $height_orig){
$width = 105;
$ratio = $width/$width_orig;
$height = $height_orig*$ratio;
}else{
$height = 360;
$ratio = $height/$height_orig;
$width = $width_orig*$ratio;
}
$destination_image = imagecreatetruecolor($width, $height);
imagecopyresampled($destination_image, $orig_image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);
imagejpeg($destination_image, $full_path, 100);
}
Check image type before function imagecreatefromjpeg() to be shure.
Something like this:
$image_type = exif_imagetype($full_path);
switch ($image_type)
{
case IMAGETYPE_GIF : $orig_image = imagecreatefromgif($file); break;
case IMAGETYPE_JPEG : $orig_image = imagecreatefromjpeg($file); break;
case IMAGETYPE_PNG : $orig_image = imagecreatefrompng($file); break;
//...
default: echo 'Wrong image type'; break;
}
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Can anybody suggest the best image resize script in php?
I'm still a newbie regarding image handling or file handling for that matter in PHP.
Would appreciate any input regarding the following
I post an image file using a simple html form and upload it via php.
When i try and alter my code to accomodate larger files (i.e. resize) I get an error.
Have been searching online but cant find anything really simple.
$size = getimagesize($_FILES['image']['tmp_name']);
//compare the size with the maxim size we defined and print error if bigger
if ($size == FALSE)
{
$errors=1;
}else if($size[0] > 300){ //if width greater than 300px
$aspectRatio = 300 / $size[0];
$newWidth = round($aspectRatio * $size[0]);
$newHeight = round($aspectRatio * $size[1]);
$imgHolder = imagecreatetruecolor($newWidth,$newHeight);
}
$newname= ROOTPATH.LOCALDIR."/images/".$image_name; //image_name is generated
$copy = imagecopyresized($imgHolder, $_FILES['image']['tmp_name'], 0, 0, 0, 0, $newWidth, $newHeight, $size[0], $size[1]);
move_uploaded_file($copy, $newname); //where I want to move the file to the location of $newname
The error I get is:
imagecopyresized(): supplied argument
is not a valid Image resource in
Thanks in advance
Thanks for all your input, i've changed it to this
$oldImage = imagecreatefromstring(file_get_contents($_FILES['image']['tmp_name']));
$copy = imagecopyresized($imgHolder, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $size[0], $size[1]);
if(!move_uploaded_file($copy, $newname)){
$errors=1;
}
Not getting a PHP log error but its not saving :(
Any ideas?
Thanks again
Result
Following works.
$oldImage = imagecreatefromjpeg($img);
$imageHolder = imagecreatetruecolor($newWidth, $newHeight);
imagecopyresized($imageHolder, $oldImage, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
imagejpeg($imageHolder, $newname, 100);
Thanks for everyones help
imagecopyresized takes an image resource as its second parameter, not a file name. You'll need to load the file first. If you know the file type, you can use imagecreatefromFILETYPE to load it. For example, if it's a JPEG, use imagecreatefromjpeg and pass that the file name - this will return an image resource.
If you don't know the file type, all is not lost. You can read the file in as a string and use imagecreatefromstring (which detects file types automatically) to load it as follows:
$oldImage = imagecreatefromstring(file_get_contents($_FILES['image']['tmp_name']));
$_FILES['image']['tmp_name'] is path not image resource. You have to use one of imagecreatefrom*() functions to create resource.
Here is my implementation of saving a thumbnail picture:
Resize and save function:
function SaveThumbnail($imagePath, $saveAs, $max_x, $max_y)
{
ini_set("memory_limit","32M");
$im = imagecreatefromjpeg ($imagePath);
$x = imagesx($im);
$y = imagesy($im);
if (($max_x/$max_y) < ($x/$y))
{
$save = imagecreatetruecolor($x/($x/$max_x), $y/($x/$max_x));
}
else
{
$save = imagecreatetruecolor($x/($y/$max_y), $y/($y/$max_y));
}
imagecopyresized($save, $im, 0, 0, 0, 0, imagesx($save), imagesy($save), $x, $y);
imagejpeg($save, $saveAs);
imagedestroy($im);
imagedestroy($save);
}
Usage:
$thumb_dir = "/path/to/thumbnaildir/"
$thumb_name = "thumb.jpg"
$muf = move_uploaded_file($_FILES['imgfile']['tmp_name'], "/tmp/test.jpg")
if($muf)
{
SaveThumbnail("/tmp/test.jpg", $thumb_dir . $thumb_name, 128, 128);
}
I use ImageMagick for stuff like that. Look how much simpler it is!
An example from one of my scripts:
$target= //destination path
move_uploaded_file($_FILES['item']['tmp_name'],$target);
$image = new imagick($target);
$image->setImageColorspace(imagick::COLORSPACE_RGB);
$image->scaleImage(350,0);
$image->writeImage($target);
You could then use getImageGeometry() to obtain the width and height.
For example:
$size=$image->getImageGeometry();
if($size['width'] > 300){ //if width greater than
$image->scaleImage(300,0);
}
Also, using scaleImage(300,0) means that ImageMagick automatically calculates the height based on the aspect ratio.
I was working on sth similar. I tried Ghostscript and ImageMagic. They are good tools but takes a but of time to set up. I ended up using 'sips' on a Snow Leopard server. Not sure if it's built in to Linux server but it's the faster solution I have found if you need sth done quick.
function resizeImage($file){
define ('MAX_WIDTH', 1500);//max image width
define ('MAX_HEIGHT', 1500);//max image height
define ('MAX_FILE_SIZE', 10485760);
//iamge save path
$path = 'storeResize/';
//size of the resize image
$new_width = 128;
$new_height = 128;
//name of the new image
$nameOfFile = 'resize_'.$new_width.'x'.$new_height.'_'.basename($file['name']);
$image_type = $file['type'];
$image_size = $file['size'];
$image_error = $file['error'];
$image_file = $file['tmp_name'];
$image_name = $file['name'];
$image_info = getimagesize($image_file);
//check image type
if ($image_info['mime'] == 'image/jpeg' or $image_info['mime'] == 'image/jpg'){
}
else if ($image_info['mime'] == 'image/png'){
}
else if ($image_info['mime'] == 'image/gif'){
}
else{
//set error invalid file type
}
if ($image_error){
//set error image upload error
}
if ( $image_size > MAX_FILE_SIZE ){
//set error image size invalid
}
switch ($image_info['mime']) {
case 'image/jpg': //This isn't a valid mime type so we should probably remove it
case 'image/jpeg':
$image = imagecreatefromjpeg ($image_file);
break;
case 'image/png':
$image = imagecreatefrompng ($image_file);
break;
case 'image/gif':
$image = imagecreatefromgif ($image_file);
break;
}
if ($new_width == 0 && $new_height == 0) {
$new_width = 100;
$new_height = 100;
}
// ensure size limits can not be abused
$new_width = min ($new_width, MAX_WIDTH);
$new_height = min ($new_height, MAX_HEIGHT);
//get original image h/w
$width = imagesx ($image);
$height = imagesy ($image);
//$align = 'b';
$zoom_crop = 1;
$origin_x = 0;
$origin_y = 0;
//TODO setting Memory
// generate new w/h if not provided
if ($new_width && !$new_height) {
$new_height = floor ($height * ($new_width / $width));
} else if ($new_height && !$new_width) {
$new_width = floor ($width * ($new_height / $height));
}
// scale down and add borders
if ($zoom_crop == 3) {
$final_height = $height * ($new_width / $width);
if ($final_height > $new_height) {
$new_width = $width * ($new_height / $height);
} else {
$new_height = $final_height;
}
}
// create a new true color image
$canvas = imagecreatetruecolor ($new_width, $new_height);
imagealphablending ($canvas, false);
if (strlen ($canvas_color) < 6) {
$canvas_color = 'ffffff';
}
$canvas_color_R = hexdec (substr ($canvas_color, 0, 2));
$canvas_color_G = hexdec (substr ($canvas_color, 2, 2));
$canvas_color_B = hexdec (substr ($canvas_color, 2, 2));
// Create a new transparent color for image
$color = imagecolorallocatealpha ($canvas, $canvas_color_R, $canvas_color_G, $canvas_color_B, 127);
// Completely fill the background of the new image with allocated color.
imagefill ($canvas, 0, 0, $color);
// scale down and add borders
if ($zoom_crop == 2) {
$final_height = $height * ($new_width / $width);
if ($final_height > $new_height) {
$origin_x = $new_width / 2;
$new_width = $width * ($new_height / $height);
$origin_x = round ($origin_x - ($new_width / 2));
} else {
$origin_y = $new_height / 2;
$new_height = $final_height;
$origin_y = round ($origin_y - ($new_height / 2));
}
}
// Restore transparency blending
imagesavealpha ($canvas, true);
if ($zoom_crop > 0) {
$src_x = $src_y = 0;
$src_w = $width;
$src_h = $height;
$cmp_x = $width / $new_width;
$cmp_y = $height / $new_height;
// calculate x or y coordinate and width or height of source
if ($cmp_x > $cmp_y) {
$src_w = round ($width / $cmp_x * $cmp_y);
$src_x = round (($width - ($width / $cmp_x * $cmp_y)) / 2);
} else if ($cmp_y > $cmp_x) {
$src_h = round ($height / $cmp_y * $cmp_x);
$src_y = round (($height - ($height / $cmp_y * $cmp_x)) / 2);
}
// positional cropping!
if ($align) {
if (strpos ($align, 't') !== false) {
$src_y = 0;
}
if (strpos ($align, 'b') !== false) {
$src_y = $height - $src_h;
}
if (strpos ($align, 'l') !== false) {
$src_x = 0;
}
if (strpos ($align, 'r') !== false) {
$src_x = $width - $src_w;
}
}
// positional cropping!
imagecopyresampled ($canvas, $image, $origin_x, $origin_y, $src_x, $src_y, $new_width, $new_height, $src_w, $src_h);
} else {
imagecopyresampled ($canvas, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
}
//Straight from Wordpress core code. Reduces filesize by up to 70% for PNG's
if ( (IMAGETYPE_PNG == $image_info[2] || IMAGETYPE_GIF == $image_info[2]) && function_exists('imageistruecolor') && !imageistruecolor( $image ) && imagecolortransparent( $image ) > 0 ){
imagetruecolortopalette( $canvas, false, imagecolorstotal( $image ) );
}
$quality = 100;
$nameOfFile = 'resize_'.$new_width.'x'.$new_height.'_'.basename($file['name']);
if (preg_match('/^image\/(?:jpg|jpeg)$/i', $image_info['mime'])){
imagejpeg($canvas, $path.$nameOfFile, $quality);
} else if (preg_match('/^image\/png$/i', $image_info['mime'])){
imagepng($canvas, $path.$nameOfFile, floor($quality * 0.09));
} else if (preg_match('/^image\/gif$/i', $image_info['mime'])){
imagegif($canvas, $path.$nameOfFile);
}
}
im looking to create thumbnails that has 100px by 100px dimension. i've seen many articles explaining the methods but most end up having the width!=height if the dimension ratio is to be kept.
for example, i have a 450px by 350px image. i would like to crop to 100px by 100px. if i were to keep the ratio, i would end up having 100px by 77px. this makes it ugly when im listing these images in a row and column. however, a image without dimension ratio will look terrible as well.
i've seen images from flickr and they look fantastic. for example:
thumbnail: http://farm1.static.flickr.com/23/32608803_29470dfeeb_s.jpg
medium size: http://farm1.static.flickr.com/23/32608803_29470dfeeb.jpg
large size: http://farm1.static.flickr.com/23/32608803_29470dfeeb_b.jpg
tks
This is done by only using a part of the image as the thumbnail which has a 1:1 aspect ratio (mostly the center of the image). If you look closely you can see it in the flickr thumbnail.
Because you have "crop" in your question, I'm not sure if you didn't already know this, but what do you want to know then?
To use cropping, here is an example:
//Your Image
$imgSrc = "image.jpg";
//getting the image dimensions
list($width, $height) = getimagesize($imgSrc);
//saving the image into memory (for manipulation with GD Library)
$myImage = imagecreatefromjpeg($imgSrc);
// calculating the part of the image to use for thumbnail
if ($width > $height) {
$y = 0;
$x = ($width - $height) / 2;
$smallestSide = $height;
} else {
$x = 0;
$y = ($height - $width) / 2;
$smallestSide = $width;
}
// copying the part into thumbnail
$thumbSize = 100;
$thumb = imagecreatetruecolor($thumbSize, $thumbSize);
imagecopyresampled($thumb, $myImage, 0, 0, $x, $y, $thumbSize, $thumbSize, $smallestSide, $smallestSide);
//final output
header('Content-type: image/jpeg');
imagejpeg($thumb);
Crop image with square based on lesser width or height
public function croppThis($target_url) {
$this->jpegImgCrop($target_url);
}
$target_url - is Name of image.
public function jpegImgCrop($target_url) {//support
$image = imagecreatefromjpeg($target_url);
$filename = $target_url;
$width = imagesx($image);
$height = imagesy($image);
$image_type = imagetypes($image); //IMG_GIF | IMG_JPG | IMG_PNG | IMG_WBMP | IMG_XPM
if($width==$height) {
$thumb_width = $width;
$thumb_height = $height;
} elseif($width<$height) {
$thumb_width = $width;
$thumb_height = $width;
} elseif($width>$height) {
$thumb_width = $height;
$thumb_height = $height;
} else {
$thumb_width = 150;
$thumb_height = 150;
}
$original_aspect = $width / $height;
$thumb_aspect = $thumb_width / $thumb_height;
if ( $original_aspect >= $thumb_aspect ) {
// If image is wider than thumbnail (in aspect ratio sense)
$new_height = $thumb_height;
$new_width = $width / ($height / $thumb_height);
}
else {
// If the thumbnail is wider than the image
$new_width = $thumb_width;
$new_height = $height / ($width / $thumb_width);
}
$thumb = imagecreatetruecolor( $thumb_width, $thumb_height );
// Resize and crop
imagecopyresampled($thumb,
$image,
0 - ($new_width - $thumb_width) / 2, // Center the image horizontally
0 - ($new_height - $thumb_height) / 2, // Center the image vertically
0, 0,
$new_width, $new_height,
$width, $height);
imagejpeg($thumb, $filename, 80);
}
You can use this code.
You need to pass source image path and thumbnail size in px, and optional destination path. if you pass it will save the image else the thumb will be shown.
Only jpg, jpeg and png are allowed.
function cropImage($sourcePath, $thumbSize, $destination = null) {
$parts = explode('.', $sourcePath);
$ext = $parts[count($parts) - 1];
if ($ext == 'jpg' || $ext == 'jpeg') {
$format = 'jpg';
} else {
$format = 'png';
}
if ($format == 'jpg') {
$sourceImage = imagecreatefromjpeg($sourcePath);
}
if ($format == 'png') {
$sourceImage = imagecreatefrompng($sourcePath);
}
list($srcWidth, $srcHeight) = getimagesize($sourcePath);
// calculating the part of the image to use for thumbnail
if ($srcWidth > $srcHeight) {
$y = 0;
$x = ($srcWidth - $srcHeight) / 2;
$smallestSide = $srcHeight;
} else {
$x = 0;
$y = ($srcHeight - $srcWidth) / 2;
$smallestSide = $srcWidth;
}
$destinationImage = imagecreatetruecolor($thumbSize, $thumbSize);
imagecopyresampled($destinationImage, $sourceImage, 0, 0, $x, $y, $thumbSize, $thumbSize, $smallestSide, $smallestSide);
if ($destination == null) {
header('Content-Type: image/jpeg');
if ($format == 'jpg') {
imagejpeg($destinationImage, null, 100);
}
if ($format == 'png') {
imagejpeg($destinationImage);
}
if ($destination = null) {
}
} else {
if ($format == 'jpg') {
imagejpeg($destinationImage, $destination, 100);
}
if ($format == 'png') {
imagepng($destinationImage, $destination);
}
}
}
I like using GDLib to fiddle with images, it's fantastically easy to work with also. There are lots of blog posts and tutorials out there. I would recommend using a class for it or similar though, as taking care of all the variations in the image can be very time consuming.
To complete #SvenKoschnicke code, here is little tool to process other image formats:
$sourceProperties = getimagesize($imgSrc);
$width = $sourceProperties[0];
$height = $sourceProperties[1];
switch ($sourceProperties[2]) {
case IMAGETYPE_PNG:
$myImage = imagecreatefrompng($imgSrc);
break;
case IMAGETYPE_GIF:
$myImage = imagecreatefromgif($imgSrc);
break;
case IMAGETYPE_JPEG:
$myImage = imagecreatefromjpeg($imgSrc);
break;
}