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    GD and Image Functions

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    User Contributed Notes 8 notes

    up
    6
    chuckstudios at gmail dot com
    15 years ago
    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:

    <?php
    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;
    }
    }
    ?>
    up
    5
    michal-ok at o2 dot pl
    19 years ago
    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.
    up
    4
    felipensp at gmail dot com
    18 years ago
    Representation decimal of a color in hexadecimal for use on functions of library GD.

    <?php

    // 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 )

    ?>
    up
    -1
    shd at earthling dot net
    18 years ago
    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:

    <?php
    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).
    up
    -2
    ingo at jache dot de
    13 years ago
    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.

    <?php

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

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

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

    $f1a = $blur;
    $f1b = 1.0 - $blur;


    $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;

    //-------------------------------------------------
    // first line is a special case
    //-------------------------------------------------
    $x = $srcw;
    $y = $srch-1;
    while (    $x--)
    {
    //horizontal blurren
    $rgb = imagecolorat($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);

    $or = $nr;
    $og = $ng;
    $ob = $nb;

    imagesetpixel($dstimg,$x,$y,($nr << 16) | ($ng << 8) | ($nb));
    }
    //-------------------------------------------------

    //-------------------------------------------------
    // now process the entire picture
    //-------------------------------------------------
    $y = $srch-1;
    while (    $y--)
    {

    $rgb = imagecolorat($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);

    $or = $nr;
    $og = $ng;
    $ob = $nb;


    //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);

    $vr = $nr;
    $vg = $ng;
    $vb = $nb;

    imagesetpixel($dstimg,$x,$y,($nr << 16) | ($ng << 8) | ($nb));
    }

    }
    //-------------------------------------------------
    return $dstimg;

    }


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

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


    ?>
    up
    -2
    jeff at lushmedia dot com
    21 years ago
    I wrote an online overview of the image functions that people might find useful. In addition to a general overview of the various function categories and code samples, I have included many interactive examples of the functions, allowing viewers to experiment with the parameters, and seeing the results in real time. The presentation is located at New York PHP
    http://www.nyphp.org/content/presentations/GDintro/
    up
    -3
    delabahan at gmail dot com
    8 years ago
    This is an example of get high resolution images.

    <?php
    /**
    * 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
    */
    ?>
    up
    -4
    mpyw
    8 years ago
    This is an example of black-and-white imagebmp() implementation.

    <?php

    /**
    * Output a black-and-white BMP image to either the browser or a file.
    *
    * @param resource $image
    * An image resource, returned by one of the image creation functions,
    * such as imagecreatetruecolor().
    *
    * @param string|null $to
    * The path or an open stream resource
    * (which is automatically being closed after this function returns)
    * to save the file to.
    * If not set or NULL, the raw image stream will be outputted directly.
    *
    * @param float $threshold
    * The number in the range of 0.0 to 1.0.
    * Brighter for larger, or darker for smaller.
    *
    * @return bool Returns TRUE on success or FALSE on failure.
    *
    */
    function imagebwbmp($image, $to = null, $threshold = 0.5)
    {
    if (    func_num_args() < 1) {
    $fmt = "imagebwbmp() expects a least 1 parameters, %d given";
    trigger_error(sprintf($fmt, func_num_args()), E_USER_WARNING);
    return;
    }
    if (!    is_resource($image)) {
    $fmt = "imagebwbmp() expects parameter 1 to be resource, %s given";
    trigger_error(sprintf($fmt, gettype($image)), E_USER_WARNING);
    return;
    }
    if (!    is_numeric($threshold)) {
    $fmt = "imagebwbmp() expects parameter 3 to be float, %s given";
    trigger_error(sprintf($fmt, gettype($threshold)), E_USER_WARNING);
    return;
    }

    if (    get_resource_type($image) !== 'gd') {
    $msg = "imagebwbmp(): supplied resource is not a valid gd resource";
    trigger_error($msg, E_USER_WARNING);
    return     false;
    }
    switch (    true) {
    case     $to === null:
    break;
    case     is_resource($to) && get_resource_type($to) === 'stream':
    case     is_string($to) && $to = fopen($to, 'wb'):
    if (    preg_match('/[waxc+]/', stream_get_meta_data($to)['mode'])) {
    break;
    }
    default:
    $msg = "imagebwbmp(): Invalid 2nd parameter, it must a writable filename or a writable stream";
    trigger_error($msg, E_USER_WARNING);
    return     false;
    }

    if (    $to === null) {
    $to = fopen('php://output', 'wb');
    }

    $biWidth = imagesx($image);
    $biHeight = imagesy($image);
    $biSizeImage = ((int)ceil($biWidth / 32) * 32 / 8 * $biHeight);
    $bfOffBits = 54 + 4 * 2; // Use two colors (black and white)
    $bfSize = $bfOffBits + $biSizeImage;

    fwrite($to, 'BM');
    fwrite($to, pack('VvvV', $bfSize, 0, 0, $bfOffBits));
    fwrite($to, pack('VVVvvVVVVVV', 40, $biWidth, $biHeight, 1, 1, 0, $biSizeImage, 0, 0, 0, 0));
    fwrite($to, "\xff\xff\xff\x00"); // white
    fwrite($to, "\x00\x00\x00\x00"); // black

    for ($y = $biHeight - 1; $y >= 0; --$y) {
    $byte = 0;
    for (    $x = 0; $x < $biWidth; ++$x) {
    $rgb = imagecolorsforindex($image, imagecolorat($image, $x, $y));
    $value = (0.299 * $rgb['red'] + 0.587 * $rgb['green'] + 0.114 * $rgb['blue']) / 0xff;
    $color = (int)($value > $threshold);
    $byte = ($byte << 1) | $color;
    if (    $x % 8 === 7) {
    fwrite($to, pack('C', $byte));
    $byte = 0;
    }
    }
    if (    $x % 8) {
    fwrite($to, pack('C', $byte << (8 - $x % 8)));
    }
    if (    $x % 32) {
    fwrite($to, str_repeat("\x00", (int)((32 - $x % 32) / 8)));
    }
    }

    return     true;
    }
    ?>
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