/** * Dither by applying a threshold map. * * @param Image $image * * @return Image */ private function ordered($image) { // Localize vars $width = $image->getWidth(); $height = $image->getHeight(); $thresholdMap = array(array(15, 135, 45, 165), array(195, 75, 225, 105), array(60, 180, 30, 150), array(240, 120, 210, 90)); // Loop using image1 $pixelIterator = $image->getCore()->getPixelIterator(); foreach ($pixelIterator as $y => $rows) { /* Loop through pixel rows */ foreach ($rows as $x => $px) { /* Loop through the pixels in the row (columns) */ /** * @var $px \ImagickPixel */ $rgba = $px->getColor(); $gray = round($rgba['r'] * 0.3 + $rgba['g'] * 0.59 + $rgba['b'] * 0.11); $threshold = $thresholdMap[$x % 4][$y % 4]; $oldPixel = ($gray + $threshold) / 2; if ($oldPixel <= 127) { // Determine if black or white. Also has the benefit of clipping excess value $newPixel = 0; } else { $newPixel = 255; } // Current pixel $px->setColor("rgb({$newPixel},{$newPixel},{$newPixel})"); } $pixelIterator->syncIterator(); /* Sync the iterator, this is important to do on each iteration */ } $type = $image->getType(); $file = $image->getImageFile(); $image = $image->getCore(); return new Image($image, $file, $width, $height, $type); // Create new image with updated core }
/** * Resize helper function. * * @param Image $image * @param int $newWidth * @param int $newHeight * * @return self * @throws \Exception */ private function _resize(&$image, $newWidth, $newHeight) { if ('GIF' == $image->getType()) { // Animated image. Eg. GIF $imagick = $image->getCore()->coalesceImages(); foreach ($imagick as $frame) { $frame->resizeImage($newWidth, $newHeight, \Imagick::FILTER_BOX, 1, false); $frame->setImagePage($newWidth, $newHeight, 0, 0); } // Assign new image with frames $image = new Image($imagick->deconstructImages(), $image->getImageFile(), $newWidth, $newHeight, $image->getType()); } else { // Single frame image. Eg. JPEG, PNG $image->getCore()->resizeImage($newWidth, $newHeight, \Imagick::FILTER_LANCZOS, 1, false); // Assign new image $image = new Image($image->getCore(), $image->getImageFile(), $newWidth, $newHeight, $image->getType()); } }
/** * @param Image $image * * @return Image */ public function apply($image) { $pixels = array(); $finalPx = array(); // Localize vars $width = $image->getWidth(); $height = $image->getHeight(); // Loop $pixelIterator = $image->getCore()->getPixelIterator(); foreach ($pixelIterator as $y => $rows) { /* Loop through pixel rows */ foreach ($rows as $x => $px) { /* Loop through the pixels in the row (columns) */ // row 0 if ($x > 0 and $y > 0) { $matrix[0][0] = $this->getColor($px, $pixels, $x - 1, $y - 1); } else { $matrix[0][0] = $this->getColor($px, $pixels, $x, $y); } if ($y > 0) { $matrix[1][0] = $this->getColor($px, $pixels, $x, $y - 1); } else { $matrix[1][0] = $this->getColor($px, $pixels, $x, $y); } if ($x + 1 < $width and $y > 0) { $matrix[2][0] = $this->getColor($px, $pixels, $x + 1, $y - 1); } else { $matrix[2][0] = $this->getColor($px, $pixels, $x, $y); } // row 1 if ($x > 0) { $matrix[0][1] = $this->getColor($px, $pixels, $x - 1, $y); } else { $matrix[0][1] = $this->getColor($px, $pixels, $x, $y); } if ($x + 1 < $width) { $matrix[2][1] = $this->getColor($px, $pixels, $x + 1, $y); } else { $matrix[2][1] = $this->getColor($px, $pixels, $x, $y); } // row 1 if ($x > 0 and $y + 1 < $height) { $matrix[0][2] = $this->getColor($px, $pixels, $x - 1, $y + 1); } else { $matrix[0][2] = $this->getColor($px, $pixels, $x, $y); } if ($y + 1 < $height) { $matrix[1][2] = $this->getColor($px, $pixels, $x, $y + 1); } else { $matrix[1][2] = $this->getColor($px, $pixels, $x, $y); } if ($x + 1 < $width and $y + 1 < $height) { $matrix[2][2] = $this->getColor($px, $pixels, $x + 1, $y + 1); } else { $matrix[2][2] = $this->getColor($px, $pixels, $x, $y); } $edge = $this->convolve($matrix); $edge = intval($edge / 2); if ($edge > 255) { $edge = 255; } /** * @var \ImagickPixel $px Current pixel. */ $finalPx[] = $edge; // R $finalPx[] = $edge; // G $finalPx[] = $edge; // B } $pixelIterator->syncIterator(); /* Sync the iterator, this is important to do on each iteration */ } $new = new \Imagick(); $new->newImage($width, $height, new \ImagickPixel('black')); /* Import the pixels into image. width * height * strlen("RGB") must match count($pixels) */ $new->importImagePixels(0, 0, $width, $height, "RGB", \Imagick::PIXEL_CHAR, $finalPx); $type = $image->getType(); $file = $image->getImageFile(); return new Image($new, $file, $width, $height, $type); // Create new image with updated core }