display image

Функции GD и функции для работы с изображениями

The image sharpen function (by Alex R. Austin) provided below seems to be very resource hungry and I couldn’t make it work on two different servers — trying to sharpen a 413 x 413 image I ended up with «Fatal error: Allowed memory size of 8388608 bytes exhausted» or «Internal Server Error» or the script terminated without notice. Because I had no priviliges to change the default memory limit on these servers I started looking for other sharpen functions. I have come across a php Unsharp Mask function which works like a charm on both of the servers I dealt with. It can be found at http://vikjavev.no/hovudsida/umtestside.php.

Representation decimal of a color in hexadecimal for use on functions of library GD.

// Representation hexadecimal
$var = ‘#FFFFFF’ ;

function getRgbFromGd ( $color_hex )

return array_map ( ‘hexdec’ , explode ( ‘|’ , wordwrap ( substr ( $color_hex , 1 ), 2 , ‘|’ , 1 )));

print_r ( getRgbFromGd ( $var ));

// Output: Array ( [0] => 255 [1] => 255 [2] => 255 )

If you happen to need a way to output a Windows BMP file (e.g. when using the PEAR ExcelWriter), feel free to use the following code:

function imagebmp ( $im , $fn = false )
if (! $im ) return false ;

if ( $fn === false ) $fn = ‘php://output’ ;
$f = fopen ( $fn , «w» );
if (! $f ) return false ;

//Image dimensions
$biWidth = imagesx ( $im );
$biHeight = imagesy ( $im );
$biBPLine = $biWidth * 3 ;
$biStride = ( $biBPLine + 3 ) & ~ 3 ;
$biSizeImage = $biStride * $biHeight ;
$bfOffBits = 54 ;
$bfSize = $bfOffBits + $biSizeImage ;

//BITMAPFILEHEADER
fwrite ( $f , ‘BM’ , 2 );
fwrite ( $f , pack ( ‘VvvV’ , $bfSize , 0 , 0 , $bfOffBits ));

//BITMAPINFO (BITMAPINFOHEADER)
fwrite ( $f , pack ( ‘VVVvvVVVVVV’ , 40 , $biWidth , $biHeight , 1 , 24 , 0 , $biSizeImage , 0 , 0 , 0 , 0 ));

$numpad = $biStride — $biBPLine ;
for ( $y = $biHeight — 1 ; $y >= 0 ; — $y )
for ( $x = 0 ; $x < $biWidth ; ++ $x )
$col = imagecolorat ( $im , $x , $y );
fwrite ( $f , pack ( ‘V’ , $col ), 3 );
>
for ( $i = 0 ; $i < $numpad ; ++ $i )
fwrite ( $f , pack ( ‘C’ , 0 ));
>
fclose ( $f );
return true ;
>
?>

It works the same way as regular imagejpeg/imagepng do and only supports GD2.0 true colour bitmaps (which is what’s required by ExcelWriter).

I wrote a simple function to convert an image resource to PGM (portable graymap) in order to feed it to an OCR program. It works just like the rest of the image output functions, and will convert to grayscale for you:

function imagepgm ( $image , $filename = null )
$pgm = «P5 » . imagesx ( $image ). » » . imagesy ( $image ). » 255\n» ;
for( $y = 0 ; $y < imagesy ( $image ); $y ++)
for( $x = 0 ; $x < imagesx ( $image ); $x ++)
$colors = imagecolorsforindex ( $image , imagecolorat ( $image , $x , $y ));
$pgm .= chr ( 0.3 * $colors [ «red» ] + 0.59 * $colors [ «green» ] + 0.11 * $colors [ «blue» ]);
>
>
if( $filename != null )
$fp = fopen ( $filename , «w» );
fwrite ( $fp , $pgm );
fclose ( $fp );
>
else
return $pgm ;
>
>
?>

I know this might look somewhat superfluous to others, but i once came across a situation where i needed a *strong* blur on an image without having ImageMagick installed. Executing the convolution-filter several times on the same image is awfully slow and still doesn’t give a good blur.

The function below accepts a truecolor-image and a blur-factor between 0.0 and 1.0. Beware: It’s still quite slow.

function blurImage ( $srcimg , $blur )
$blur = $blur * $blur ;
$blur = max ( 0 , min ( 1 , $blur ));

$srcw = imagesx ( $srcimg );
$srch = imagesy ( $srcimg );

$dstimg = imagecreatetruecolor ( $srcw , $srch );

$cr = 0 ; $cg = 0 ; $cb = 0 ;
$nr = 0 ; $ng = 0 ; $nb = 0 ;

$rgb = imagecolorat ( $srcimg , 0 , 0 );
$or = ( $rgb >> 16 ) & 0xFF ;
$og = ( $rgb >> 8 ) & 0xFF ;
$ob = ( $rgb ) & 0xFF ;

$nr = ( $cr * $f1a ) + ( $or * $f1b );
$ng = ( $cg * $f1a ) + ( $og * $f1b );
$nb = ( $cb * $f1a ) + ( $ob * $f1b );

$rgb = imagecolorat ( $srcimg , 0 , $y );
$or = ( $rgb >> 16 ) & 0xFF ;
$og = ( $rgb >> 8 ) & 0xFF ;
$ob = ( $rgb ) & 0xFF ;

$x = $srcw ;
while ( $x —)
//horizontal
$rgb = imagecolorat ( $srcimg , $x , $y );
$cr = ( $rgb >> 16 ) & 0xFF ;
$cg = ( $rgb >> 8 ) & 0xFF ;
$cb = ( $rgb ) & 0xFF ;

$nr = ( $cr * $f1a ) + ( $or * $f1b );
$ng = ( $cg * $f1a ) + ( $og * $f1b );
$nb = ( $cb * $f1a ) + ( $ob * $f1b );

//vertical
$rgb = imagecolorat ( $dstimg , $x , $y + 1 );
$vr = ( $rgb >> 16 ) & 0xFF ;
$vg = ( $rgb >> 8 ) & 0xFF ;
$vb = ( $rgb ) & 0xFF ;

$nr = ( $nr * $f1a ) + ( $vr * $f1b );
$ng = ( $ng * $f1a ) + ( $vg * $f1b );
$nb = ( $nb * $f1a ) + ( $vb * $f1b );

$srcimg = imagecreatefromjpeg ( «test.jpg» );
$dstimg = blurImage ( $srcimg , 0.2 );

header ( ‘Content-type: image/jpeg’ );
echo( imagejpeg ( $dstimg ) );
exit();

This is an example of get high resolution images.

/**
* Class name : resizeImage
* Created by : wang
* Description : This class is to resize the image from original size to new size
*/
class resizeImage
/**
* Function name : resize_img
* Description : This function is to resize image
* @param : $origimg variable is the original image
* @param : $newimg variable is the new image
* @param : $w variable is the width of image
* @param : $f variable is the height of image
*/
public function resize_img ( $origimg , $newimg , $w , $h ) $info = getimagesize ( $origimg );
$mime = $info [ ‘mime’ ];

// Make sure that the requested file is actually an image
if( substr ( $mime , 0 , 6 ) != ‘image/’ )
header ( ‘HTTP/1.1 400 Bad Request’ );
return ‘Error: requested file is not an accepted type: ‘ . $origimg ;
exit();
>

// Check they extention of image
$extension = image_type_to_extension ( $info [ 2 ]);
if( strtolower ( $extension ) == ‘.png’ ) $img = $this -> resize_imagepng ( $origimg , $w , $h );
imagepng ( $img , $newimg );
imagedestroy ( $img );
>elseif( strtolower ( $extension ) == ‘.jpeg’ ) $img = $this -> resize_imagejpeg ( $origimg , $w , $h );
imagejpeg ( $img , $newimg );
imagedestroy ( $img );
>elseif( strtolower ( $extension == ‘.gif’ )) $img = $this -> resize_imagegif ( $origimg , $w , $h );
imagegif ( $img , $newimg );
imagedestroy ( $img );
>

>
/**
* End function name : resize_img
*/

/**
* Function name : resize_imagepng
* Description : This function is to resize png image
* @param : $file variable is the original image
* @param : $w variable is the width of image
* @param : $f variable is the height of image
*/
private function resize_imagepng ( $file , $w , $h ) list( $width , $height ) = getimagesize ( $file );
$src = imagecreatefrompng ( $file );
$dst = imagecreatetruecolor ( $w , $h );
imagecopyresampled ( $dst , $src , 0 , 0 , 0 , 0 , $w , $h , $width , $height );
return $dst ;
>
/**
* End function name : resize_imagepng
*/

/**
* Function name : resize_imagejpeg
* Description : This function is to resize jpeg image
* @param : $file variable is the original image
* @param : $w variable is the width of image
* @param : $f variable is the height of image
*/
private function resize_imagejpeg ( $file , $w , $h ) list( $width , $height ) = getimagesize ( $file );
$src = imagecreatefromjpeg ( $file );
$dst = imagecreatetruecolor ( $w , $h );
imagecopyresampled ( $dst , $src , 0 , 0 , 0 , 0 , $w , $h , $width , $height );
return $dst ;
>
/**
* End function name : resize_imagejpeg
*/

/**
* Function name : resize_imagegif
* Description : This function is to resize gif image
* @param : $file variable is the original image
* @param : $w variable is the width of image
* @param : $f variable is the height of image
*/
private function resize_imagegif ( $file , $w , $h ) list( $width , $height ) = getimagesize ( $file );
$src = imagecreatefromgif ( $file );
$dst = imagecreatetruecolor ( $w , $h );
imagecopyresampled ( $dst , $src , 0 , 0 , 0 , 0 , $w , $h , $width , $height );
return $dst ;
>
/**
* End function name : resize_imagegif
*/
>
/**
* End class name : resizeImage
*/
?>

Источник

How to Display Image in PHP from Folder/Directory

Here, I have to show the code display image in PHP from folder. As well as, might get image from the database.

After that, you might see some examples of the list of all images in folder and subfolders from the directory and folder using PHP.

Display Image in Php from Folder

Hence, I have to show some methods of displaying image from the directory folder path.

    
Here in your form and text
 "; ?> 

Thus, we have to use echo to print the image. this is the keywords of Php. Php provides this for print an integer and string values.

After that, Html syntax for displaying an image. now, as you know put the image name from the main folder.

As a rule, in the image, there is a source option. you can add image name make sure must know your image folder path in your project.

So, if you have a folder and subfolder inside the folder available number of images. therefore, pick the specific image name and copy image name.

for example, you can see have to mention an example of image source src=’image-name.png’ this is a direct image path.

So, if the image in directory or folder and subfolder then put this code src=’folderName/SubfolderName/image-name.png’. Make sure you understand the folder directory and subfolder directory.

Similarly, list all images in folder and subfolders you can get an image and fetch the image from a folder.

How to Display Image from Database in Php

Similarly, we created an above code for retrieve images from directory same as getting the image name from the database in PHP and retrieve an image.

   
Here in your form and text
 "; > ?> 

Here, you saw a display image from the database in Php. This the main method to apply this code on your Html code.

Firstly, create a connection between the database and then get the image details. Also, check out this code How to Insert JSON data into MySQL using PHP

After that, added a MySQL select query for fetch the image from MySQL database.

Afterward, this is the keyword of SQL which is provided for array $row[‘image name’].

Now, in this image name, you can replace your own field name in your database as you defined.

Image is not Displaying in Php

So, sometimes image not display. they showing error rather than blank.

So, what do you want firstly, you can check the path. it means directory and folder name.

If it’s correct then check your image name as well as, check image extension likewise, jpg or png check out image and image name.

If both are the same image might display this is the right to wait. make sure images have available are there and check your database image name and field name.

Hence, print your image details array which you get for fetch image from the database.

Also, check both names otherwise one time can put direct image because sometimes comes error from Html syntax.

The main method read your warning message and follow line number and insertions what saying.

If syntax error you can put out our image displaying syntax code.

Conclusion

Finally, view all codes method best method of displaying an image from the folder and directory with example.

If any query checks and asks us in the comment section. Also, have main relative similar topic How to Store and Retrieve Image from database in Php

Источник

Output or Display an Image in the Browser from PHP

This article will show you how to output or display an image in the web browser from PHP, with a quick copy & paste code snippet.

Images in PHP

We’ve covered how to resize images in PHP using the GD library. Once an image is created, it can be saved or returned to the browser to be displayed without saving it.

Outputting/Displaying an Image in PHP without Saving it

The following PHP code snippet creates an image object and returns it without saving it:

// The header() function is used to set the HTTP header which tells the web browser what kind of response it is receiving // This must be changed based on the image format - eg. image/jpeg or image/png header('content-type: image/jpeg'); // Depending on the format of the image, different functions must be used to create an image object from the file // pathinfo() is used to determine the image type by the file extension switch (pathinfo($image_file_path)['extension]) < case 'png': $image = imagecreatefrompng($image_file_path); break; case 'gif': $image = imagecreatefromgif($image_file_path); break; default: $image = imagecreatefromjpeg($image_file_path); >// Here, you could perform operations on the image - resizing, watermarking, etc before returning it // Output the image. The browser will know what to do with the image data because it was told what kind of data to expect with the header() function above echo imagejpeg($image); // Destroy the image object to free up memory imagedestroy($image);

The PHP GD library includes a variety of functions for manipulating and resizing images.

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