mambax7 / XoopsCore25

						}

						// scan through current truecolor image copy alpha channel to temp image as grayscale

						for ($x = 0; $x < $this->thumbnail_width; $x++) {

							for ($y = 0; $y < $this->thumbnail_height; $y++) {

								$PixelColor = phpthumb_functions::GetPixelColor($this->gdimg_output, $x, $y);

								imagesetpixel($img_alpha_mixdown_dither, $x, $y, $dither_color[($PixelColor['alpha'] * 2)]);

							}

						}

						// dither alpha channel grayscale version down to 2 colors

						imagetruecolortopalette($img_alpha_mixdown_dither, true, 2);

						imagecolortransparent($this->gdimg_output, $TransparentColor);

						// scan through alpha channel image and note pixels with >50% transparency

						for ($x = 0; $x < $this->thumbnail_width; $x++) {

							for ($y = 0; $y < $this->thumbnail_height; $y++) {

								$AlphaChannelPixel = phpthumb_functions::GetPixelColor($img_alpha_mixdown_dither, $x, $y);

								if ($AlphaChannelPixel['red'] > 127) {

									imagesetpixel($this->gdimg_output, $x, $y, $TransparentColor);

								}

							}

						}

						imagedestroy($img_alpha_mixdown_dither);

						$this->DebugMessage('AlphaChannelFlatten() set image to 255+1 colors with transparency for GIF output', __FILE__, __LINE__);