Trying to create a sepia image...

[munkynpunky]

I use this script to make my images B+W, but is there anyway to make the images appear sepia too?

<?php 
// The file you are grayscaling 
$file = $_GET['imageid'];

// This sets it to a .jpg, but you can change this to png or gif if that is what you are working with
header('Content-type: image/jpeg'); 

// Get the dimensions
list($width, $height) = getimagesize($file); 

// Define our source image 
$source = imagecreatefromjpeg($file); 

// Creating the Canvas 
$bwimage= imagecreate($width, $height); 

//Creates the 256 color palette
for ($c=0;$c<256;$c++) 
{
$palette[$c] = imagecolorallocate($bwimage,$c,$c,$c);
}

//Creates yiq function
function yiq($r,$g,$b) 
{
return (($r*0.299)+($g*0.587)+($b*0.114));
} 

//Reads the origonal colors pixel by pixel 
for ($y=0;$y<$height;$y++) 
{
for ($x=0;$x<$width;$x++) 
{
$rgb = imagecolorat($source,$x,$y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;

//This is where we actually use yiq to modify our rbg values, and then convert them to our grayscale palette
$gs = yiq($r,$g,$b);
imagesetpixel($bwimage,$x,$y,$palette[$gs]);
}
} 

// Outputs a jpg image, but you can change this to png or gif if that is what you are working with
imagejpeg($bwimage); 
?>

[shachi]

http://www.ditman.net/ps/index.php

[djr33]

Think about sepia. It's just brown tones.

That means you will want to have (generally) a high red value, and a higher green value than blue. Aside from that, to make it darker, just increase RGB equally, and that should work.

[Twey]

to make it darker, just increase RGB equally

Decrease, surely?

[djr33]

Ah, yes. That would soon be found out

[munkynpunky]

I'm using this script

<?php
//This class turns a color image into Sepia
class bw {
  
  var $_bw;
  var $_type;

  function printImage() {
    switch ($this->_type) {
        case IMAGETYPE_GIF : {
      header('Content-Type: image/gif');
      imagegif($this->_bw);
    } break;
    case IMAGETYPE_JPEG : {
      header('Content-Type: image/jpeg');
      imagejpeg($this->_bw);
    } break;
    case IMAGETYPE_PNG : {
      header('Content-Type: image/png');
      imagepng($this->_bw);
    } break;
    default : {
      header('Content-Type: image/jpeg');
      imagejpeg($this->_bw);
    } break;
    } // switch
    imagedestroy($this->_bw);
  }
  
  function bw($path) {
    // Let's find out what type is this image:
    if (@is_file($path)) {
      $this->_type = @exif_imagetype($path);
      switch ($this->_type) {
        case IMAGETYPE_GIF : {
      $img = @imagecreatefromgif($path);
    } break;
    case IMAGETYPE_JPEG : {
      $img = @imagecreatefromjpeg($path);
    } break;
    case IMAGETYPE_PNG : {
      $img = @imagecreatefrompng($path);
    } break;
    default : {
      $img =_errorImg();
    } break;
      } // switch ($this->_type)
      
      // If image was created successfully, do some magic stuff
      if ($img) {
    $this->_bw = $this->_toBW($img);
    imagedestroy($img);
      } // if ($this->_img)
    } // if (@is_file...)
    else {
      $this->_bw = $this->_errorImg();
    }
  }
  function _errorImg() {
    return imagecreate(200,200);
  }
  
  function _toBW($src){
    $x = imagesx($src);
    $y = imagesy($src);

    $dest = imagecreatetruecolor($x, $y);

    for ($i=0;$i<$x;$i++) {
      for ($j=0;$j<$y;$j++) {
        $oldcolor = imagecolorsforindex($src, imagecolorat($src, $i, $j));
    $newcolor = (int)(($oldcolor['red'] + $oldcolor['green'] + $oldcolor['blue']) / 3);
    $sepia = array(
            "red" => 145,
            "green" => 65,
            "blue" => 10
             );
    $mix = array(
                "o" => 0.7,
            "d" => 0.3
             );
        $newr = ($newcolor*$mix['o'] + $sepia['red']*$mix['d'])>255?255:($newcolor*$mix['o'] + $sepia['red']*$mix['d']);
        $newg = ($newcolor*$mix['o'] + $sepia['green']*$mix['d'])>255?255:($newcolor*$mix['o'] + $sepia['green']*$mix['d']);
        $newb = ($newcolor*$mix['o'] + $sepia['blue']*$mix['d'])>255?255:($newcolor*$mix['o'] + $sepia['blue']*$mix['d']);
    imagesetpixel($dest, $i, $j, imagecolorallocate($dest, $newr, $newg, $newb ));
      } // for($j
    } // for ($i
    
    return $dest;
  }
}

import_request_variables('g','bw_');

$bw = new bw($bw_im);
$bw->printImage();

?>

I tried to pass the image as $this, but I just get a load of scribble on the page, how do i tell it which image to make sepia?

any thoughts - im still a newbie

[munkynpunky]

Think about sepia. It's just brown tones.

That means you will want to have (generally) a high red value, and a higher green value than blue. Aside from that, to make it darker, just increase RGB equally, and that should work.

Yeah i was thinking that, however I could not see on the original script where to set the RGB codes... there wasnt a really clear way to do it

[djr33]

Here's something you could play with--

<?php
function graytosepia($im) {
  for ($x=0; $x<imagesx($im);$x++) {
   for ($y=0; $y<imagesy($im);$y++) {
      $c = imagecolorsforindex($im,imagecolorat($im,$x,$y));
      $r = 1.5*$c['red'];
      $g = 1*$c['red'];
      $b = 0.5*$c['red'];
      imagesetpixel($im,$x,$y,imagecolorallocate($im,$r,$g,$b));
    }
  }
}
?>

Might want to look here:
http://www.php.net/manual/en/function.imagefilter.php
Note IMG_FILTER_COLORIZE

[munkynpunky]

Is there anyway to edit this to get it displaying sepia?

<?php 
// The file you are grayscaling 
$file = $_GET['image'];

// This sets it to a .jpg, but you can change this to png or gif if that is what you are working with
header('Content-type: image/jpeg'); 

// Get the dimensions
list($width, $height) = getimagesize($file); 

// Define our source image 
$source = imagecreatefromjpeg($file); 

// Creating the Canvas 
$bwimage= imagecreate($width, $height); 

//Creates the 256 color palette
for ($c=0;$c<256;$c++) 
{
$palette[$c] = imagecolorallocate($bwimage,$c,$c,$c);
}

//Creates yiq function
function yiq($r,$g,$b) 
{
return (($r*0.299)+($g*0.587)+($b*0.114));
} 

//Reads the origonal colors pixel by pixel 
for ($y=0;$y<$height;$y++) 
{
for ($x=0;$x<$width;$x++) 
{
$rgb = imagecolorat($source,$x,$y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;

//This is where we actually use yiq to modify our rbg values, and then convert them to our grayscale palette
$gs = yiq($r,$g,$b);
imagesetpixel($bwimage,$x,$y,$palette[$gs]);
}
} 

// Outputs a jpg image, but you can change this to png or gif if that is what you are working with
imagejpeg($bwimage); 
?>

[munkynpunky]

http://www.ditman.net/ps/index.php

hey,

i need help actually working out how to tell the script what the image is, my other script just uses $image... but i cannot work out how to get this to work.. do you know who created that script?

<?php
/**
* This class turns a color image into Sepia
**/
class bw {
  
  var $_bw;
  var $_type;

  function printImage() {
    switch ($this->_type) {
        case IMAGETYPE_GIF : {
      header('Content-Type: image/gif');
      imagegif($this->_bw);
    } break;
    case IMAGETYPE_JPEG : {
      header('Content-Type: image/jpeg');
      imagejpeg($this->_bw);
    } break;
    case IMAGETYPE_PNG : {
      header('Content-Type: image/png');
      imagepng($this->_bw);
    } break;
    default : {
      header('Content-Type: image/jpeg');
      imagejpeg($this->_bw);
    } break;
    } // switch
    imagedestroy($this->_bw);
  }
  
  function bw($path) {
    // Let's find out what type is this image:
    if (@is_file($path)) {
      $this->_type = @exif_imagetype($path);
      switch ($this->_type) {
        case IMAGETYPE_GIF : {
      $img = @imagecreatefromgif($path);
    } break;
    case IMAGETYPE_JPEG : {
      $img = @imagecreatefromjpeg($path);
    } break;
    case IMAGETYPE_PNG : {
      $img = @imagecreatefrompng($path);
    } break;
    default : {
      $img =_errorImg();
    } break;
      } // switch ($this->_type)
      
      // If image was created successfully, do some magic stuff
      if ($img) {
    $this->_bw = $this->_toBW($img);
    imagedestroy($img);
      } // if ($this->_img)
    } // if (@is_file...)
    else {
      $this->_bw = $this->_errorImg();
    }
  }
  function _errorImg() {
    return imagecreate(200,200);
  }
  
  function _toBW($src){
    $x = imagesx($src);
    $y = imagesy($src);

    $dest = imagecreatetruecolor($x, $y);

    for ($i=0;$i<$x;$i++) {
      for ($j=0;$j<$y;$j++) {
        $oldcolor = imagecolorsforindex($src, imagecolorat($src, $i, $j));
    $sepiacolor = 0.299/255*$oldcolor['red'] + 0.587/255*$oldcolor['green'] + 0.114/255*$oldcolor['blue'];
        $newr = (($sepiacolor + 0.1912)*255)>255?255:($sepiacolor + 0.1912)*255;
        $newg = (($sepiacolor - 0.0544)*255)<0?0:($sepiacolor - 0.0544)*255;
        $newb = (($sepiacolor - 0.2210)*255)<0?0:($sepiacolor - 0.2210)*255;
    imagesetpixel($dest, $i, $j, imagecolorallocate($dest, $newr, $newg, $newb ));
      } // for($j
    } // for ($i
    
    return $dest;
  }
}

import_request_variables('g','bw_');

$bw = new bw($bw_im);
$bw->printImage();

?>