/**
* Takes samples from the given GD at 5 pixel increments
* @param GDBackend $gd The source image
* @param integer $horizontal Number of samples to take horizontally
* @param integer $vertical Number of samples to take vertically
* @return array List of colours for each sample, each given as an associative
* array with red, blue, green, and alpha components
*/
protected function sampleAreas(GDBackend $gd, $horizontal = 4, $vertical = 4)
{
$samples = array();
for ($y = 0; $y < $vertical; $y++) {
for ($x = 0; $x < $horizontal; $x++) {
$colour = imagecolorat($gd->getImageResource(), $x * 5, $y * 5);
$samples[] = ImageColorsforIndex($gd->getImageResource(), $colour);
}
}
return $samples;
}
function greyscale($rv = 38, $gv = 36, $bv = 26)
{
$this->rv = $rv;
$this->gv = $gv;
$this->bv = $bv;
$this->rt = $this->rv + $this->bv + $this->gv;
$this->rr = $this->rv == 0 ? 0 : 1 / ($this->rt / $this->rv);
$this->br = $this->bv == 0 ? 0 : 1 / ($this->rt / $this->bv);
$this->gr = $this->gv == 0 ? 0 : 1 / ($this->rt / $this->gv);
for ($this->dy = 0; $this->dy <= $this->r; $this->dy++) {
for ($this->dx = 0; $this->dx <= $this->q; $this->dx++) {
$this->pxrgb = @imagecolorat($this->t, $this->dx, $this->dy);
$this->rgb = @ImageColorsforIndex($this->t, $this->pxrgb);
$this->newcol = $this->rr * $this->rgb['red'] + $this->br * $this->rgb['blue'] + $this->gr * $this->rgb['green'];
$this->setcol = @ImageColorAllocate($this->t, $this->newcol, $this->newcol, $this->newcol);
@imagesetpixel($this->t, $this->dx, $this->dy, $this->setcol);
}
}
}
/**
* Make the image greyscale
* $rv = red value, defaults to 38
* $gv = green value, defaults to 36
* $bv = blue value, defaults to 26
* Based (more or less entirely, with changes for readability) on code from
* http://www.teckis.com/scriptix/thumbnails/teck.html
*/
public function greyscale($rv = 38, $gv = 36, $bv = 26)
{
if (!$this->gd) {
return null;
}
$width = $this->width;
$height = $this->height;
$newGD = imagecreatetruecolor($this->width, $this->height);
// Preserves transparency between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
$rt = $rv + $bv + $gv;
$rr = $rv == 0 ? 0 : 1 / ($rt / $rv);
$br = $bv == 0 ? 0 : 1 / ($rt / $bv);
$gr = $gv == 0 ? 0 : 1 / ($rt / $gv);
for ($dy = 0; $dy < $height; $dy++) {
for ($dx = 0; $dx < $width; $dx++) {
$pxrgb = imagecolorat($this->gd, $dx, $dy);
$heightgb = ImageColorsforIndex($this->gd, $pxrgb);
$newcol = $rr * $heightgb['red'] + $br * $heightgb['blue'] + $gr * $heightgb['green'];
$setcol = ImageColorAllocateAlpha($newGD, $newcol, $newcol, $newcol, $heightgb['alpha']);
imagesetpixel($newGD, $dx, $dy, $setcol);
}
}
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Make the image greyscale.
* Default color weights are based on standard BT.601 (those used in PAL, NTSC and many software packages, also see
* https://en.wikipedia.org/wiki/Grayscale#Luma_coding_in_video_systems )
*
* $R = red weight, defaults to 299
* $G = green weight, defaults to 587
* $B = blue weight, defaults to 114
* $brightness = brightness in percentage, defaults to 100
*/
public function greyscale($R = 299, $G = 587, $B = 114, $brightness = 100)
{
$width = $this->width;
$height = $this->height;
$newGD = imagecreatetruecolor($this->width, $this->height);
// Preserves transparency between images
imagealphablending($newGD, false);
imagesavealpha($newGD, true);
$rt = $R + $G + $B;
// if $rt is 0, bad parameters are provided, so result will be a black image
$rr = $rt ? $R / $rt : 0;
$gr = $rt ? $G / $rt : 0;
$br = $rt ? $B / $rt : 0;
// iterate over all pixels and make them grey
for ($dy = 0; $dy < $height; $dy++) {
for ($dx = 0; $dx < $width; $dx++) {
$pxrgb = imagecolorat($this->gd, $dx, $dy);
$heightgb = ImageColorsforIndex($this->gd, $pxrgb);
$newcol = $rr * $heightgb['red'] + $br * $heightgb['blue'] + $gr * $heightgb['green'];
$newcol = min(255, $newcol * $brightness / 100);
$setcol = ImageColorAllocateAlpha($newGD, $newcol, $newcol, $newcol, $heightgb['alpha']);
imagesetpixel($newGD, $dx, $dy, $setcol);
}
}
$output = clone $this;
$output->setImageResource($newGD);
return $output;
}
/**
* Make the image greyscale
* $rv = red value, defaults to 38
* $gv = green value, defaults to 36
* $bv = blue value, defaults to 26
* Based (more or less entirely, with changes for readability) on code from http://www.teckis.com/scriptix/thumbnails/teck.html
*/
function greyscale($rv = 38, $gv = 36, $bv = 26)
{
$width = $this->width;
$height = $this->height;
$newGD = imagecreatetruecolor($this->width, $this->height);
$rt = $rv + $bv + $gv;
$rr = $rv == 0 ? 0 : 1 / ($rt / $rv);
$br = $bv == 0 ? 0 : 1 / ($rt / $bv);
$gr = $gv == 0 ? 0 : 1 / ($rt / $gv);
for ($dy = 0; $dy < $height; $dy++) {
for ($dx = 0; $dx < $width; $dx++) {
$pxrgb = imagecolorat($this->gd, $dx, $dy);
$heightgb = ImageColorsforIndex($this->gd, $pxrgb);
$newcol = $rr * $heightgb['red'] + $br * $heightgb['blue'] + $gr * $heightgb['green'];
$setcol = ImageColorAllocate($newGD, $newcol, $newcol, $newcol);
imagesetpixel($newGD, $dx, $dy, $setcol);
}
}
$output = clone $this;
$output->setGD($newGD);
return $output;
}
/**
* Make the image greyscale
* $rv = red value, defaults to 38
* $gv = green value, defaults to 36
* $bv = blue value, defaults to 26
* Based (more or less entirely, with changes for readability) on code from http://www.teckis.com/scriptix/thumbnails/teck.html
*/
function greyscale($rv = 38, $gv = 36, $bv = 26)
{
$width = $this->width;
$height = $this->height;
$newGD = imagecreatetruecolor($this->width, $this->height);
$rt = $rv + $bv + $gv;
$rr = $rv == 0 ? 0 : 1 / ($rt / $rv);
$br = $bv == 0 ? 0 : 1 / ($rt / $bv);
$gr = $gv == 0 ? 0 : 1 / ($rt / $gv);
for ($dy = 0; $dy <= $height; $dy++) {
for ($dx = 0; $dx <= $width; $dx++) {
$pxrgb = imagecolorat($this->gd, $dx, $dy);
$heightgb = ImageColorsforIndex($this->gd, $pxrgb);
$newcol = $rr * $heightgb['red'] + $br * $heightgb['blue'] + $gr * $heightgb['green'];
$setcol = ImageColorAllocate($newGD, $newcol, $newcol, $newcol);
imagesetpixel($newGD, $dx, $dy, $setcol);
}
}
// imagecopyresampled($newGD, $this->gd, 0,0, $srcX, $srcY, $width, $height, $srcWidth, $srcHeight);
$output = new GD();
$output->setGD($newGD);
if ($this->quality) {
$output->setQuality($this->quality);
}
return $output;
}
function greyscale($rv = 38, $gv = 36, $bv = 26)
{
//BOF - DokuMan - 2011-01-06
// Not working properly for PNG & GIF images, so skipping
if ($this->effects_disabled || $this->k == 3 || $this->k == 1) {
return;
}
$this->bgc = $bg_colour;
$this->br = $this->hex2rgb(substr($this->bgc, 0, 2));
$this->bg = $this->hex2rgb(substr($this->bgc, 2, 2));
$this->bb = $this->hex2rgb(substr($this->bgc, 4, 2));
$this->dot = @ImageCreate(6, 6);
$this->dot_base = @ImageColorAllocate($this->dot, $this->br, $this->bg, $this->bb);
$this->zenitha = @ImageColorClosest($this->t, $this->br, $this->bg, $this->bb);
for ($this->rad = 0; $this->rad < 6.3; $this->rad += 0.005) {
$this->xpos = floor($this->q + sin($this->rad) * $this->q) / 2;
$this->ypos = floor($this->r + cos($this->rad) * $this->r) / 2;
$this->xto = 0;
if ($this->xpos >= $this->q / 2) {
$this->xto = $this->q;
}
@ImageCopyMerge($this->t, $this->dot, $this->xpos - 3, $this->ypos - 3, 0, 0, 6, 6, 30);
@ImageCopyMerge($this->t, $this->dot, $this->xpos - 2, $this->ypos - 2, 0, 0, 4, 4, 30);
@ImageCopyMerge($this->t, $this->dot, $this->xpos - 1, $this->ypos - 1, 0, 0, 2, 2, 30);
//EOF - DokuMan - 2011-01-06
$this->rv = $rv;
$this->gv = $gv;
$this->bv = $bv;
$this->rt = $this->rv + $this->bv + $this->gv;
$this->rr = $this->rv == 0 ? 0 : 1 / ($this->rt / $this->rv);
$this->br = $this->bv == 0 ? 0 : 1 / ($this->rt / $this->bv);
$this->gr = $this->gv == 0 ? 0 : 1 / ($this->rt / $this->gv);
for ($this->dy = 0; $this->dy <= $this->r; $this->dy++) {
for ($this->dx = 0; $this->dx <= $this->q; $this->dx++) {
$this->pxrgb = @imagecolorat($this->t, $this->dx, $this->dy);
$this->rgb = @ImageColorsforIndex($this->t, $this->pxrgb);
$this->newcol = $this->rr * $this->rgb['red'] + $this->br * $this->rgb['blue'] + $this->gr * $this->rgb['green'];
$this->setcol = @ImageColorAllocate($this->t, $this->newcol, $this->newcol, $this->newcol);
@imagesetpixel($this->t, $this->dx, $this->dy, $this->setcol);
}
}
}
//BOF - DokuMan - 2011-01-06
}
