imagecopymergegray

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

imagecopymergegrayCopia e funde parte de uma imagem com escala de cinza

Descrição

imagecopymergegray(
    GdImage $dst_image,
    GdImage $src_image,
    int $dst_x,
    int $dst_y,
    int $src_x,
    int $src_y,
    int $src_width,
    int $src_height,
    int $pct
): bool

imagecopymergegray() copia uma parte de src_image sobre dst_image iniciando nas coordenadas x,y src_x, src_y com uma largura de src_width e uma altura de src_height. A porção definida será copiada nas coordenadas x,y, dst_x e dst_y.

Esta função é idêntica a imagecopymerge() exceto que ao fundir ela preserva a matiz da origem convertendo os pixels de destino para escala de cinza antes da operação de cópia.

Parâmetros

dst_image

Recurso da imagem de destino.

src_image

Recurso da imagem de origem.

dst_x

Coordenada x do ponto de destino.

dst_y

Coordenada y do ponto de destino.

src_x

Coordenada x do ponto de origem.

src_y

Coordenada y do ponto de origem.

src_width

Largura da imagem de origem.

src_height

Altura da imagem de origem.

pct

O parâmetro src_image será alterado para escala de cinza de acordo com pct, onde 0 é totalmente em cinza e 100 é sem alteração. Quando pct = 100, esta função é idêntica a imagecopy() para imagems de paleta, exceto por ignorar componentes alfa, enquanto implementa transparência alfa para imagens em cores verdadeiras.

Valor Retornado

Retorna true em caso de sucesso ou false em caso de falha.

Registro de Alterações

Versão Descrição
8.0.0 dst_image e src_image esperam instâncias GdImage agora; anteriormente, resources eram esperados.

Exemplos

Exemplo #1 Uso de imagecopymergegray()

<?php
// Cria instâncias de imagens
$dest = imagecreatefromgif('php.gif');
$src = imagecreatefromgif('php.gif');

// Copia e funde - Cinza = 20%
imagecopymergegray($dest, $src, 10, 10, 0, 0, 100, 47, 20);

// Mostra e libera da memória
header('Content-Type: image/gif');
imagegif($dest);

imagedestroy($dest);
imagedestroy($src);
?>

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User Contributed Notes 8 notes

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1
amezghal at msn dot com
15 years ago
gray effect :)
<?php
header
('content-type:image/png');
$url_img = 'my_image.png';
$img = imagecreatefrompng($url_img);
$x = imagesx($img);
$y = imagesy($img);
$gray_img = imagecreatetruecolor($x, $y);
imagecolorallocate($gray_img, 0, 0, 0);
for (
$i = 0; $i < $x; $i++) {
  for (
$j = 0; $j < $y; $j++) {
   
$rgb = imagecolorat($img, $i, $j);
   
$r = ($rgb >> 16) & 0xFF;
   
$g = ($rgb >> 8) & 0xFF;
   
$b = $rgb & 0xFF;
    
//for gray mode $r = $g = $b
   
$color = max(array($r, $g, $b));
   
$gray_color = imagecolorexact($new_img, $color, $color,   $color);
    
imagesetpixel($gray_img, $i, $j, $gray_color);
   }
}
?>
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1
Mark Barba
18 years ago
//  Using the same code I found here on php.net,
// I was able to figure out how to convert GIF (or any other
// format GD supports) to CIP format.  CIP is the image
// format for Cisco IP Phones...  7905/7940 and 7960
// models...  Hope someone finds this useful and make it
// better... 

/////// GIF2CIP PHP code ///////

// Convert image in memory to grayscale
    $img_width  = imageSX($im2);
    $img_height = imageSY($im2);

   // convert to grayscale
   // note: this will NOT affect your original image, unless
   // originalFileName and destinationFileName are the same
   for ($y = 0; $y <$img_height; $y++) {
       for ($x = 0; $x <$img_width; $x++) {
           $rgb = imagecolorat($im2, $x, $y);
           $red  = ($rgb >> 16) & 0xFF;
           $green = ($rgb >> 8)  & 0xFF;
           $blue  = $rgb & 0xFF;

           $gray = round(.299*$red + .587*$green + .114*$blue);
          
           // shift gray level to the left
           $grayR = $gray << 16;  // R: red
           $grayG = $gray << 8;    // G: green
           $grayB = $gray;        // B: blue
          
           // OR operation to compute gray value
           $grayColor = $grayR | $grayG | $grayB;

           // set the pixel color
           imagesetpixel ($im2, $x, $y, $grayColor);
           imagecolorallocate ($im2, $gray, $gray, $gray);
       }
   }
/////////////////////////////////////////////////////////

    // Modifies palette to only 4-colors (CIP Images on 7905/7940 & 7960 is 2-bit color)
    ImageTrueColorToPalette2($im2,FALSE,4);

    // Basic header for CIP Image files...
    header ("Content-type: text/xml");
    echo "<CiscoIPPhoneImage> ";
    echo "<LocationX>-1</LocationX> ";
    echo "<LocationY>-1</LocationY> ";
    echo "<Width>132</Width> ";
    echo "<Height>65</Height> ";
    echo "<Depth>2</Depth> ";
    echo "<Data>";

// get image dimensions (almost same code as above)
   $img_width  = imageSX($im2);
   $img_height = imageSY($im2);

   // convert to grayscale
   // note: this will NOT affect your original image, unless
   // originalFileName and destinationFileName are the same
   for ($y = 0; $y <$img_height; $y++) {
       for ($x = 0; $x+4 <$img_width; $x = $x+4)
       {
            for ($ix = 0; $ix < 4; $ix++)
            {
               $rgb = imagecolorat($im2, $x + $ix, $y);

               // I came up with this translation on my own
               // Some smart person is bound to perfect it
               if ($rgb=="2") {$rgb=0;$Gray1[$ix] = $rgb;continue;}
               if ($rgb=="0") {$rgb=2;$Gray1[$ix] = $rgb;continue;}
               if ($rgb=="1") {$rgb=1;$Gray1[$ix] = $rgb;continue;}
               if ($rgb=="3") {$rgb=3;$Gray1[$ix] = $rgb;continue;}
           }
                $gray1 = $Gray1[0];
                $gray2 = $Gray1[1] << 2;
                $gray3 = $Gray1[2] << 4;
                $gray4 = $Gray1[3] << 6;
               
                // Pack 4 pixels into a single byte for CIP images
                $grey = $gray1 | $gray2 | $gray3 | $gray4;

                // CIP image data is sent in HEX, strtoupper is not really needed.
                $code = strtoupper(dechex($grey));

                // My quick fix to padding single HEX values
                if (strlen($code)==1) $code = "0".$code;
                echo $code;
               
       }

   }
    echo "</Data>";
    echo "<Title>$myvar</Title> ";
    echo "<Prompt>$city</Prompt> ";
    echo "</CiscoIPPhoneImage>";
    exit;
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1
switch251 at netcourrier dot com
19 years ago
In addition to code_couturier too: his code will produce blue pictures, because the value he uses to set the pixel color (the code is incomplete: I first thought it should be $gray) is between 0 and 255, which corresponds to blue levels.

To convert the picture to grayscale, use the following code:

<?php
   
// replace with your files
   
$originalFileName    = "colorPicture.jpg";
   
$destinationFileName = "bwPicture.jpg";
   
   
// create a copy of the original image
    // works with jpg images
    // fell free to adapt to other formats ;)
   
$fullPath = explode(".",$originalFileName);
   
$lastIndex = sizeof($fullPath) - 1;
   
$extension = $fullPath[$lastIndex];
    if (
preg_match("/jpg|jpeg|JPG|JPEG/", $extension)){
       
$sourceImage = imagecreatefromjpeg($originalFileName);
    }

   
// get image dimensions
   
$img_width  = imageSX($sourceImage);
   
$img_height = imageSY($sourceImage);

   
// convert to grayscale
    // note: this will NOT affect your original image, unless
    // originalFileName and destinationFileName are the same
   
for ($y = 0; $y <$img_height; $y++) {
        for (
$x = 0; $x <$img_width; $x++) {
           
$rgb = imagecolorat($sourceImage, $x, $y);
           
$red   = ($rgb >> 16) & 0xFF;
           
$green = ($rgb >> 8)  & 0xFF;
           
$blue  = $rgb & 0xFF;

           
$gray = round(.299*$red + .587*$green + .114*$blue);
           
           
// shift gray level to the left
           
$grayR = $gray << 16;   // R: red
           
$grayG = $gray << 8;    // G: green
           
$grayB = $gray;         // B: blue
           
            // OR operation to compute gray value
           
$grayColor = $grayR | $grayG | $grayB;

           
// set the pixel color
           
imagesetpixel ($sourceImage, $x, $y, $grayColor);
           
imagecolorallocate ($sourceImage, $gray, $gray, $gray);
        }
    }

   
// copy pixel values to new file buffer
   
$destinationImage = ImageCreateTrueColor($img_width, $img_height);
   
imagecopy($destinationImage, $sourceImage, 0, 0, 0, 0, $img_width, $img_height);

   
// create file on disk
   
imagejpeg($destinationImage, $destinationFileName);
   
   
// destroy temp image buffers
   
imagedestroy($destinationImage);   
   
imagedestroy($sourceImage);
?>

Copy-paste, replace the file names on the top and there you go (picture files must be in same folder as this script. If not, you will have to do your own file management).
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0
anonymous at domain dot com
14 years ago
grayscale conversion is built-in with imagefilter().

<?php
    
/* other code */

    
$image = imagecreatefromjpeg('some.jpg');
    
imagefilter($image, IMG_FILTER_GRAYSCALE);

    
/* other code (ie save) */

    
imagedestroy($image);

    
/* other code */
?>

you could create the sepia effect by the following:

<?php
    
/* other code */

    
$image = imagecreatefromjpeg('some.jpg');
    
imagefilter($image, IMG_FILTER_GRAYSCALE);
    
imagefilter($image, IMG_FILTER_COLORIZE, 112, 66, 20);
    
//Wikipedia RGB definition of sepia

     /* other code (ie save) */

    
imagedestroy($image);

    
/* other code */
?>
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0
szamil at ginf dot pl
16 years ago
I've changed a little switch251's code and here we have sephia effect
<?php
  
// replace with your files
   
$originalFileName    = $filename;
   
$destinationFileName = "2".$filename;
   
   
// create a copy of the original image
    // works with jpg images
    // fell free to adapt to other formats ;)
   
$fullPath = explode(".",$originalFileName);
   
$lastIndex = sizeof($fullPath) - 1;
   
$extension = $fullPath[$lastIndex];
    if (
preg_match("/jpg|jpeg|JPG|JPEG/", $extension))
    {
       
$sourceImage = imagecreatefromjpeg($originalFileName);
    }

   
// get image dimensions
   
$img_width  = imageSX($sourceImage);
   
$img_height = imageSY($sourceImage);

   
// convert to grayscale
    // note: this will NOT affect your original image, unless
    // originalFileName and destinationFileName are the same
   
for ($y = 0; $y <$img_height; $y++)
    {
        for (
$x = 0; $x <$img_width; $x++)
        {
           
$rgb = imagecolorat($sourceImage, $x, $y);
           
$red   = ($rgb >> 16) & 0xFF;
           
$green = ($rgb >> 8)  & 0xFF;
           
$blue  = $rgb & 0xFF;

         
//sephia
           
$red2 = min($red*.393 + $green*.769 + $blue*.189,255);
           
$green2 = min($red*.349 + $green*.686 + $blue*.168,255);
           
$blue2  = min($red*.272 + $green*.534 + $blue*.131,255);
           
// shift gray level to the left
           
           
$grayR = $red2 << 16;   // R: red
           
$grayG = $green2 << 8 ;    // G: green
           
$grayB = $blue2;         // B: blue
           
            // OR operation to compute gray value
           
$grayColor = $grayR | $grayG | $grayB;

           
           
// set the pixel color
           
imagesetpixel ($sourceImage, $x, $y, $grayColor);
           
imagecolorallocate ($sourceImage, $gray, $gray, $gray);
        }
    }

   
// copy pixel values to new file buffer
   
$destinationImage = ImageCreateTrueColor($img_width, $img_height);
   
imagecopy($destinationImage, $sourceImage, 0, 0, 0, 0, $img_width, $img_height);

   
// create file on disk
   
imagejpeg($destinationImage, $destinationFileName);
   
   
// destroy temp image buffers
   
imagedestroy($destinationImage);   
   
imagedestroy($sourceImage);
?>
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0
annonymous at example dot com
20 years ago
in addition to code_couturier - try this formula to calculate gray-value (luminance) in his "more exact" way:

$gray = round(.299*$red + .587*$green + .114*$blue);
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0
code_couturier at graffiti dot net
20 years ago
# very fast way to generate a grayscal-
# image from a true color image

#...

# --- quick grayscale image
for ($y = 0; $y <$img_height; $y++) {
for ($x = 0; $x <$img_width; $x++) {

# here we extract the green from
# the pixel at x,y , to use it as gray value
$gray = (ImageColorAt($image, $x, $y) >> 8) & 0xFF;

# a more exact way would be this:
# $rgb = ImageColorAt($image, $x, $y);
# $red = ($rgb >> 16) & 0xFF;
# $green = (trgb >> 8) & 0xFF;
# $blue = $rgb & 0xFF;
# $gray = (int)(($red+$green+$blue)/4);

# and here we set the new pixel/color
  imagesetpixel ($image, $x, $y,
  ImageColorAllocate ($image, $gray,$gray,$gray));
}
}

# ...
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0
mail at laeubi dot de
20 years ago
This function don't work properly for me on trucolerimages (have not tried yet for other types) it jsut produce a part-grayscale image, and some color get mesed up.
I found a workaround here:
http://www.phpbuilder.com/columns/cash20030526.php3?page=2

[quote]
Advanced Image Editing Under the GD Library
Colorizing
Colorizing images is fairly easy to do. The easiest way to colorize an image is fairly simple to grasp. Create an image of the same dimensions and fill that image with the color you want to change it to. This new image is then placed on top of the older image, giving it a colorized look.

<?php
function imagecolorize(&$im,&$col,$pct) {
   
// Get the image's width
   
$im_w = imagesx($im); 
   
// Get the image's height
   
$im_h = imagesy($im); 
   
// Set a pixel with the color, so we can get it easily
   
$setpixel = imagesetpixel($im,$im_w,0,$col); 
   
// Get the color
   
$index = imagecolorat($im,$im_w,0); 
   
// Find the color in the index
   
$rgb = imagecolorsforindex($im,$index); 
   
// Get the red value
   
$r = $rgb["red"];
   
// Get the green value
   
$g = $rgb["green"]; 
   
// Get the blue value
   
$b = $rgb["blue"]; 
   
// Create the layover
   
$layover = imagecreate($im_w,$im_h); 
   
// Allocate the color on this image
   
$color = imagecolorallocate($layover,$r,$g,$b); 
   
// Fill the image with the new color (this really isn't needed)
   
$fill = imagefill($layover,0,0,$color); 
   
// Merge the layover on top of the older image
   
$merge = imagecopymerge($im,$layover,0,0,0,0,$im_w,$im_h,$pct);
   
imagedestroy($layover); // Destroy the layover
}
?>

If we use a blue layover RGB(0,0,255), we get this result:
[/quote]

if you use black or gray, its not perfekt, but better than nothing ;)
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