hi
How to create jpeg image in PHP.

Hi
using GD library we can create jpeg image in PHP
Thanks

Can you able to give me the sample for create jpeg using GD library ?

Hi Varghese,
Please view this link it can help to know more to create thumbnail whatever it is either jpeg or gif
Article - How to create thumbnails with PHP and gd.

For simple we can

header("Content-type: image/jpeg");
$im = @imagecreate(100, 50)
or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 255, 255, 255);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 1, 5, 5, "A Simple Text String", $text_color);
imagejpeg($im);
imagedestroy($im);

i think it will help you

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Everything Possible

You can create thumbnail image with the use of imagecopyresampled method. This is one GD image library method. In this method just mention the source and destination location with specific width and height. With this you can create thumbnail of any image. Sample is as follow.

<?php
// The file
$filename = 'test.jpg';
$percent = 0.5;

// Content type
header('Content-type: image/jpeg');

// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

// Output
imagejpeg($image_p, null, 100);
?>

Varghese,

You can also use Imagemagick library for image manipulations. Imagemagick is much faster with better quality compared to GD library.

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Hi Jeyaseelan & venkat_charya,
The above examples shows the image in the browser. Actually i want to save the image into a specific location. How to do this.

Hi

Add the destination path in output

for example if you want to store the image in the same location then


<?php
// The file
$filename = 'test.jpg';
$percent = 0.5;

// Get new dimensions
list($width, $height) = getimagesize($filename);
$new_width = $width * $percent;
$new_height = $height * $percent;

// Resample
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);

// Output
imagejpeg($image_p, $filename, 100);
?>

The above code will save the image in jpg format with the file name 'test.jpg'.

Thanks

Varghese

In ImageJPEG function we just have to remove the null parameter and put the destination path. As i stated in bold red color, just put the destination path in that variable it will store the image in that specified location.

imagejpeg($image_p, $filename, 100);

Anand,

Can you tell me which magick function we can use for image creation and how we can say it is much faster than GD?

Creating images with Imagemagick is very easy.

<?
$ImgPath = "test.jpg";
$newWidth = 150;
$newHeight = 150;

//# -- Reads the jpg image
$ImgHandler = Imagick_readimage($ImgPath);

//#-- function used to resize the image
Imagick_sample($ImgHandler, $newWidth, $newHeight ,"100x100");

$DestImgPath = "newimage.jpg";
//#-- Writes the image as newimage.jpg
Imagick_writeimages($ImgHandler,$DestImgPath);
?>

The above code will reads an image and saves into a specific location with a new name.

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Imagemagick creates the images much faster when compared to GD library. Also GD creates the image with 72 DPI only, where as Imagemagick holds the actual DPI of the original image to the newly created images. Thus Imagemagick is much better than GD library.

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hi Anand,

can you give a simple example program, how to create a image by using Imagemagic and how faster then GD.

Thanks
-Kathir

Anand

I checked your code and it is working good. Actually GD library creates image with 96 DPI resolution not 72 DPI.

Kathir

As above anand specified you can create image with the help of Imagick read and write.

<?
//Specify image name and set desired height and width
$ImgPath = "test.jpg";
$newWidth = 150;
$newHeight = 150;

//# -- Reads the jpg image
$ImgHandler = Imagick_readimage($ImgPath);

//#-- function used to resize the image
Imagick_sample($ImgHandler, $newWidth, $newHeight ,"100x100");

$DestImgPath = "newimage.jpg";
//#-- Writes the image as newimage.jpg
Imagick_writeimages($ImgHandler,$DestImgPath);
?>

I used this and found it is much faster than GD and also the created image resolution having same DPI like the original image. This is not possible in GD.

I checked with sample code and found magick creates image with same resolution like original image but Can anybody tell me how we can set our desired DPI for new creation image?

venkat_charya,

you can set the resolution of the image by using imagick_setdpi function.

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Anand,

Can you please provide one sample about how to use that function?

Hi KK

use the below sample to change the image DPI
<?
//Specify image name and set desired height and width
$ImgPath = "test.jpg";
$newWidth = 150;
$newHeight = 150;
$horizontalDPI = 400;
$verticalDPI = 400;

//# -- Reads the jpg image
$ImgHandler = Imagick_readimage($ImgPath);

//#-- function used to resize the image
Imagick_sample($ImgHandler, $newWidth, $newHeight ,"100x100");

$DestImgPath = "newimage.jpg";

//#-- set the image Horizontal and Vertical dots per inch
Imagick_setdpi ( $ImgHandler, $horizontalDPI,$verticalDPI )

//#-- Writes the image as newimage.jpg
Imagick_writeimages($ImgHandler,$DestImgPath);
?>

Thanks

Hi Anand
as kk say..
it will be really aapreciatable if u give more information..
thanx in advance

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