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Digg  imagecolortransparent
Define a color as transparent
(PHP 4, PHP 5)
Related Examples ( Source code ) » imagecolortransparent Examples ( Source code ) » Image copy Examples ( Source code ) » Making Colors Transparent with imagecolortransparent() Examples ( Source code ) » Water mark Effect Code Examples / Notes » imagecolortransparentfred
Wow! I am actually surprized there are no functions to retrieve transparency information from the image. I assume I'm not missing anything since there are all kinds of notes about how to get around this limitation. At any rate, here is some code to read the gif file and retrieve the missing information. The code will speak volumes. <?php class GifInfo { var $m_transparentRed; var $m_transparentGreen; var $m_transparentBlue; var $m_signature; var $m_version; var $m_width; var $m_height; var $m_width; var $m_height; var $m_colorFlag; var $m_backgroundIndex; function GifInfo($filename) { $fp = fopen($filename,"rb"); $result = fread($fp,13); $this->m_signature = substr($result,0,3); $this->m_version = substr($result,3,3); $this->m_width = ord(substr($result,6,1)) + ord(substr($result,7,1)) * 256; $this->m_height = ord(substr($result,8,1)) + ord(substr($result,9,1)) * 256; $this->m_colorFlag = ord(substr($result,10,1)) >> 7; $this->m_background = ord(substr($result,11)); if($this->m_colorFlag) { $tableSizeNeeded = ($this->m_background + 1) * 3; $result = fread($fp,$tableSizeNeeded); $this->m_transparentRed = ord(substr($result,$this->m_background * 3,1)); $this->m_transparentGreen = ord(substr($result,$this->m_background * 3 + 1,1)); $this->m_transparentBlue = ord(substr($result,$this->m_background * 3 + 2,1)); } fclose($fp); } } ?> And to use this class.... <?php $size = getimagesize($userfile); $img2 = ImageCreate($w,$h); $gi = new GifInfo($userfile); if($gi->m_version == '89a' && $gi->m_colorFlag == 1) { $transparent = imagecolorallocate($img2, $gi->m_transparentRed, $gi->m_transparentGreen, $gi->m_transparentBlue); imagecolortransparent ($img2,$transparent); } ?> cinymini
When you use palette images (created with imagecreate()), the first color allocated is the background color. This color cannot be used for transparency. So if you want to make the background transparent, first allocate a dummy background color, then allocate the real background color and declare this is as transparent.
07-dec-2001 03:18
when a color is defined as transparent, anytime that color is used in another function (before or after transparency definition) will be transparent ex: $red = ImageColorAllocate ($im, 233, 14, 91); $blue = ImageColorAllocate ($im, 0x20, 0x60, 0xaa); imagefilledarc ($im, 100, 100, 80, 80, 0, 60, $blue, IMG_ARC_PIE);//arc is transparent even though is not defined yet $trans=imagecolortransparent($im,$blue);//affects all occurances of blue, before and after this line ALSO: ImageString ($im, 10, 5, 5, "Transparent Text String", $blue); ---is equivalent to---- ImageString ($im, 10, 5, 5, "Transparent Text String", $trans); contact
Transparent GIF w/ text from TTF Font ------------------------------------- $image = imagecreatetruecolor(192, 36); $trans_color = imagecolorallocate($image, 255, 0, 0); $color = imagecolorallocate($image, 255, 255, 255); imagecolortransparent($image, $trans_color); imagettftext($image, 10, 0, 10, 23, $color, "impact.ttf", " MENU ITEM"); imagegif($image, "output.gif"); imagedestroy($image); mikasto
To resize transparent PNG (if image is transparent & ImageColorTransparent() returns -1): 1) create a new image with the new sizes 2) make the new image all transparent 3) turn off the alpha blending for the new image (to keep the alpha channel when copy data) 4) do copyresampled or copyresized into new image PHP code: // 1 $im2 = ImageCreateTrueColor($w, $h); // 2 ImageColorTransparent($im2, ImageColorAllocate($im2, 0, 0, 0)); // 3 ImageAlphaBlending($im2, false); // 4 ImageCopyResampled($im2, $im, 0, 0, 0, 0, $w, $h, ImageSX($im), ImageSY($im)); emilus
To resize or copy image (gif [with gd>=2.0.28] or png) with transparency. -Take current transparency color -create a new image with palette like old one and fill new image with transparent color -set transparent color -copy resized image $colorTransparent = imagecolortransparent($im); $im2 = imagecreate($new_w,$new_h); imagepalettecopy($im2,$im); imagefill($im2,0,0,$colorTransparent); imagecolortransparent($im2, $colorTransparent); imagecopyresized($im2,$im,0,0,0,0,$new_w,$new_h,$imsx,$imsy); kevinoe
To resize a transparent image into a thumbnail while keeping its transparency. The quality of the thumbnail is pretty bad though.. but it is transparent. $image = ImageCreateFromGIF('transparentimage.gif'); $img_width = ImagesX($image); $img_height = ImagesY($image); $new_width = '100'; $new_height = ($new_width * $img_height) / $img_width; $resized = imagecreatetruecolor($new_width, $new_height); $colorTransparent = imagecolortransparent($image); imagepalettecopy($image, $resized); imagefill($resized, 0, 0, $colorTransparent); imagecolortransparent($resized, $colorTransparent); imagetruecolortopalette($resized, true, 256); imagecopyresized($resized, $image, 0, 0, 0, 0, $new_width, $new_height, $img_width, $img_height); ingrid
This script should take an animated GIF whit a white background transparancy, put some white=transparant text on it, and can be used in any page using the filename and the normal image tags. Everything works well, exept the animation. The GIF animation stands still. Don't know how to keep the animation animated. Is it possible in PHP? <?php $TextFile = "teller.txt"; $Count = trim(file_get_contents($TextFile)); $FP = fopen($TextFile, "r"); $Count=fgets($FP, 4096); fclose ($FP); settype($Count, "integer"); $Count++; if ($FP = fopen ($TextFile, "w")){ fwrite ($FP, $Count); fclose ($FP); } $image = "blad.gif"; $im = imagecreatefromgif($image); $white = imageColorAllocate ($im, 255, 255, 255); $trans = imagecolortransparent($im,$white); $hit = "$Count"; $ip = $_SERVER["REMOTE_ADDR"]; ImageString($im, 2, 30, 60, " je bent bezoeker ", $white); ImageString($im, 3, 20, 80, " $ip.$hit", $trans); header("Content-Type: image/gif"); Imagegif($im,'',100); ImageDestroy ($im); ?> erik
This script creates transparency for a unspecific RBG color for an already created PNG image. It also includes script of overlay text that does not get ruined in the process. <?php header("Content-type: image/png"); $image = imagecreatetruecolor(250, 250); $string = $_GET['text']; $im = imagecreatefrompng("dynIcon.png"); $img = imagecreatetruecolor(16,16); $orange = imagecolorallocate($im, 220, 210, 60); $bg_color = imagecolorat($im,1,1); $px = (imagesx($im) - 3 * strlen($string)) / 2; imagecolortransparent($im, $bg_color); imagestring($im, 3, $px, 5, $string, $orange); imagepng($im); imagedestroy($im); ?> Use $bg_color = imagecolorat($im,1,1); for instance, if you made the transparent color in photoshop by clearing out all the color leaving you with the checkered background showing you it's empty. blaine ehrhart
This script creates transparency for a specific RBG color for an already created GIF image. <?php $im = imagecreatefromgif('trans.gif'); $img = imagecreatetruecolor(16,16); $trans = imagecolorallocate($img,255,99,140); imagecolortransparent($img,$trans); imagecopy($img,$im,0,0,0,0,16,16); imagetruecolortopalette($img, true, 256); imageinterlace($img); imagegif($img,'trans.gif'); imagedestroy($img); ?> rob
This block of code should preserve transparency when resizing an image using the GD library. <?php /** * Try to preserve transparency info * $orig_type - Original Image Type * $orig_img - GD Image Resource for original image * $new_img - GD Image Resource for resized image */ // Transparency only available for GIFs & PNGs if ( ($orig_type == IMAGETYPE_GIF) || ($orig_type == IMAGETYPE_PNG) ) { $trnprt_indx = imagecolortransparent($orig_img); // If we have a specific transparent color if ($trnprt_indx >= 0) { // Get the original image's transparent color's RGB values $trnprt_color = imagecolorsforindex($orig_img, $trnprt_indx); // Allocate the same color in the new image resource $trnprt_indx = imagecolorallocate($new_img, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']); // Completely fill the background of the new image with allocated color. imagefill($new_img, 0, 0, $trnprt_indx); // Set the background color for new image to transparent imagecolortransparent($new_img, $trnprt_indx); // Always make a transparent background color for PNGs that don't have one allocated already } elseif ($orig_type == IMAGETYPE_PNG) { // Turn off transparency blending (temporarily) imagealphablending($new_img, false); // Create a new transparent color for image $color = imagecolorallocatealpha($new_img, 0, 0, 0, 127); // Completely fill the background of the new image with allocated color. imagefill($this->new_img, 0, 0, $color); // Restore transparency blending imagesavealpha($this->new_img, true); } } ?> talkback
Only one color may be transparent in one image. The last call to imagecolortransparent will be the color that is set to transparent. I am processing button images that have a slightly different fill color than the background color outside the border of the button. I was hoping that I could just make both of those colors transparent and solve the problem. Hope this tidbit of info will save you some time. calar
ok some works... i had a test-sytem with GDLib, phpinfo shows me this version: "GD Version 2.0 or higher" so far no porblems with: imageColorTransparent Then we had to copy ouer codes to another sever on this server phpinfo shots me version: "GD Version bundled (2.0.12 compatible)" The jpg was wrong and nothing was transparent. The point is, you have to use: imagecopymerge Don't if its true on any system just work on SUSE 8.2 PHP 4.3.2 shelley_hina
It took me a while to figure this out. I added visual web thumbnail preview graphic from http://www.thumbshots.org and http://www.thumbshots.com to my customer sites to visualize web pages. Then I needed to create a small blank transparent PNG image if the thumbshot is not available. You can do this easily using imagecolortransparent function. It came out really nice and fast. It's very cool stuff and highly recommended library for all your web site needs! // Use GD library to create transparent color PNG image of the pixel size $ImgGD = imagecreate(120, 90); $ImgWhite = imagecolorallocate($ImgGD, 255, 255, 255); imagefill($ImgGD, 0, 0, $ImgWhite); imagecolortransparent($ImgGD, $ImgWhite); // Capture STDOUT to buffer ob_start(); imagepng($ImgGD); $Image = ob_get_contents(); ob_end_clean(); // Remember to free your memory imagedestroy($ImgGD); // Print image to web browser. print $Image raiserle
it goes also more simply i rather work with arrays <?php if(!function_exists('gif_info')) { function gif_info($filename) { $fp= fopen($filename,'rb'); $result= fread($fp,13); $file['signatur']= substr($result,0,3); $file['version']= substr($result,3,3); $file['width']= ord(substr($result,6,1))+ord(substr($result,7,1))*256; $file['height']= ord(substr($result,8,1))+ord(substr($rsult,9,1))*256; $file['flag']= ord(substr($result,10,1))>>7; $file['trans_red']= ord(substr($result,ord(substr($result,11))*3,1)); $file['trans_green']= ord(substr($result,ord(substr($result,11))*3+1,1)); $file['trans_blue']= ord(substr($result,ord(substr($result,11))*3+2,1)) ; fclose($fp); return $file; } } print_r(gif_info($_FILES['files']['temp_name'])); ?> marshall.at.byterage.net
In response to the note above... ImageColorTransparent() does work on TrueColor images. I have it working myself but I do remember having to add an extra step somewhere. Anyways, here is how I overlay text on a jpeg. Don't forget, you need GD 2.x for true color to work. This example requires TTF support also. // // get src image and dimensions $src_img = ImageCreateFromJPEG("foo.jpg"); $src_w = ImageSX($src_img); $src_h = ImageSY($src_img); // // create empty true color canvas, def bg is black $txt_img = ImageCreateTrueColor($src_w,$src_h); // // define colors $white = ImageColorAllocate ($txt_img, 255, 255, 255); $black = ImageColorAllocate ($txt_img, 0, 0, 0); // // add your white text ImageTTFText ($txt_img, 80, 25, 65, 350, $white, "impact.ttf", "Kung Fu"); // // make black bg transparent ImageColorTransparent($txt_img, $black); // // merge text image onto src image ImageCopyMerge($src_img,$txt_img,0,0,0,0,$src_w,$src_h,30); // 30% opacity 'Now' you can do resizing or whatever and output it. You need to create yet another blank image to resample. (Actually you can resize the image before the text overlay step with some small mods, but its REALLY messy if you want the output size to be dynamic) // // create empty true color canvas for resizing. $dst_img = ImageCreateTrueColor(100,100); // // resize ImageCopyResampled($dst_img,$src_img,0,0,0,0,100,100,$src_w,$src_h); // // output to browser. ImageJPEG($dst_img,'',70); // quality 70 If someone could tell me a shorter way to do this, that would be sweet. The way it is now, it just feels like there is one too many steps to get this done. But I am glad it works at all! glenn
in reference to webmaster at webnetwizard dotco dotuk who had a rather complicated method of determining if a GIF had any transparency set ... imagecolortransparent will return -1 if no transparency is found. eg: $transColorIndexMain = imageColorTransparent($mainImgObj); if ($transColorIndexMain >= 0 ) { # GIF has transparency ... ; } Current PHP Version: 4.4.4 [GD Version] => bundled (2.0.28 compatible) php_comment et 5mm de
In fact this function can be used for two purposes: A.) to work with transparency while dealing with images in php (see watermark example) B.) to create a partially transparent picture For A.) one can work with truecolor images with some regulations, but B.) can only be used with palette-based images (= indexed = created with imagecreate not imagecreatetruecolor) and formats that support transparency (png, gif). For instance if you want to cut out a color out of a give picture that is in truecolor, use the following method to first convert it to palette-based image, assign the transparency and give it to the browser as png: <? $img = imagecreatefromjpeg('test.jpg'); imagetruecolortopalette($img, false, 256); // convert $white = imagecolorresolve($img, 255, 255, 255); // resolve given palette entry imagecolortransparent($img, $white); header("Content-type: image/png"); imagepng($img); ?> cladiniz
If you have a transparent PNG , in PHP 4.3.1 , GD 2.0 , you don't need to set the transparency anymore , it's automatic ...
webmaster
I'm feeling particularly altruistic today, so here is the code to accompany the text I submitted about a script that 'intelligently' detects if an uploaded GIF has transparency or not, and creates a thumbnail accordingly: if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploadfile)) { $note = "Image was successfully uploaded.\n"; // Now create thumbnail version of the uploaded image and save it to // folder "$fixPath/images/thumbs". First, we need to create a // resource "handle" for a copy of the uploaded image $img_error = false; list($width, $height, $type) = getimagesize($uploadfile); switch($type) // Allowed types: image/gif,image/jpeg,image/x-png { case 1: // GIF $src = @imagecreatefromgif($uploadfile); if (!$src) $img_error = true; break; case 2: // JPEG . . . case 3: // PNG . . . default: $img_error = true; } // resource handle for source image now in $src // Now calculate scaling factor and put in $sf if(!$img_error) { if($width >= $height && $width > 100) $sf = $width / 100; elseif($height > 100) $sf = $height / 100; else $sf = 1; $newwidth = intval($width / $sf); $newheight = intval($height / $sf); switch($type) // Allowed types: image/gif,image/jpeg,image/x-png { case 1: // GIF $tpcolor = imagecolorat($src, 0, 0); // in the real world, you'd better test all four corners, not just one! $dest = imagecreate($newwidth, $newheight); // $dest automatically has a black fill... imagepalettecopy($dest, $src); imagecopyresized($dest, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); $pixel_over_black = imagecolorat($dest, 0, 0); // ...but now make the fill white... $bg = imagecolorallocate($dest, 255, 255, 255); imagefilledrectangle($dest, 0, 0, $newwidth, $newheight, $bg); imagecopyresized($dest, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); $pixel_over_white = imagecolorat($dest, 0, 0); // ...to test if transparency causes the fill color to show through: if($pixel_over_black != $pixel_over_white) { // Background IS transparent imagefilledrectangle($dest, 0, 0, $newwidth, $newheight, $tpcolor); imagecopyresized($dest, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); imagecolortransparent($dest, $tpcolor); imagegif($dest, "$fixPath/images/thumbs/$userfile"); } else // Background (most probably) NOT transparent imagegif($dest, "$fixPath/images/thumbs/$userfile"); break; case 2: // JPEG . . . case 3: // PNG . . . break; } imagedestroy($src); imagedestroy($dest); } else $note = "Error: Uploaded image but could not create thumbnail"; header("location: $fixPath/index.php?next=$next&nb=$nb&userfile=$userfile"); } else $note = "Could not find anything to upload\n"; thomas
I wanted to have non-rectangular images being displayed on various website-backgrounds. piece of cake with png-24 and sane browsers, but not with IE. GIF-files are useless since they tend to have ugly edges. So that's what i came up with, a script to merge a given PNG-24 against a background-image. The script only merges areas of partial transparency (think anti-aliased edges) of the PNG onto the background-image, leaving 100% transparent areas as they are. output is a 256-color gif with transparency. <?PHP function alphaishMerge(&$img_unten, &$img_oben, &$transCol) { $sx = imagesx($img_unten); $sy = imagesy($img_oben); // just be sure imagealphablending($img_unten, TRUE); imagealphablending($img_oben, TRUE); // imagecopy respects alpha channels imagecopy($img_unten, $img_oben, 0, 0, 0, 0, $sx, $sy); for ($x = 0; $x < $sx; $x++) { for ($y = 0; $y < $sy; $y++) { // get RGBA of upper image $pxloben = imagecolorat($img_oben, $x, $y); $pxloben = imagecolorsforindex($img_oben, $pxloben); if ($pxloben['alpha'] == 127) { // if this pixel is fully transparent... // ...set it to the transparent color imagesetpixel($img_unten,$x,$y,$transCol); } } } } // images have to be the same size $bg_file = "background.jpg"; $png_file ="kauscha.png"; // background-image (jpg) $img_bg = imagecreatefromjpeg($bg_file); // image which is supposed to be put on the background (PNG-24) $img_png = imagecreatefrompng($png_file); // This color is the one getting transparent in the gif-file $transCol = imagecolorallocate($img_bg, 0, 0, 0); // magic alphaishMerge($img_bg, $img_png, $transCol); // reduce color depth imagetruecolortopalette($img_bg, FALSE, 255); // make it transparent $transCol = imagecolortransparent($img_bg, $transCol); header("Content-type: image/gif"); imagegif($img_bg); ?> i hope thats useful for anyone. jonatan
I have found that ImageColorTransparent() works on true color images if and only if the transparent color is black. (PHP 4.2.3/GD 2.0) php
i had problems with the example by sandhawk at spies dot com because my png overlay, and the jpeg canvas were using different color depths, so, this function corrects this: [code] function WatermarkImage($CanvasImage, $WatermarkImage /* MUST BE PHG */, $Opacity=10, $Quality=75) { // create true color canvas image: $canvas_src = imagecreatefromjpeg($CanvasImage); $canvas_w = ImageSX($canvas_src); $canvas_h = ImageSY($canvas_src); $canvas_img = imagecreatetruecolor($canvas_w, $canvas_h); imagecopy($canvas_img, $canvas_src, 0,0,0,0, $canvas_w, $canvas_h); imagedestroy($canvas_src); // no longer needed // create true color overlay image: $overlay_src = imagecreatefrompng($WatermarkImage); $overlay_w = ImageSX($overlay_src); $overlay_h = ImageSY($overlay_src); $overlay_img = imagecreatetruecolor($overlay_w, $overlay_h); imagecopy($overlay_img, $overlay_src, 0,0,0,0, $overlay_w, $overlay_h); imagedestroy($overlay_src); // no longer needed // setup transparent color (pick one): $black = imagecolorallocate($overlay_img, 0x00, 0x00, 0x00); $white = imagecolorallocate($overlay_img, 0xFF, 0xFF, 0xFF); $magenta = imagecolorallocate($overlay_img, 0xFF, 0x00, 0xFF); // and use it here: imagecolortransparent($overlay_img, $white); // copy and merge the overlay image and the canvas image: imagecopymerge($canvas_img, $overlay_img, 0,0,0,0, $overlay_w, $overlay_h, $Opacity); // output: header("Content-type: image/jpeg"); imagejpeg($canvas_img, '', $Quality); imagedestroy($overlay_img); imagedestroy($canvas_img); } // call function with opcity set to 50% and 95% quality WatermarkImage("canvas.jpg", "overlay.png", 50, 95); [/code] creator79>>web>>de
Hi! I'm using GDLib 1.6.3 so far I know. You can have transparency on any defined color on any image type when using the imagecolorclosest($im, $R, $G, $B) function instead of imagecolorallocate() or imagecolorexact(). sandhawk
here's a little snippet of code that i got for getting images to overlay with transparency(based off text overlay above). $olay_img = imagecreatefromPNG("overlay.png); //NOTE I recomment you use png for this, artifacts from jpeg images can look bad when you overlay them $src_img = ImageCreateFromJPEG("image.jpg"); $src_w = ImageSX($src_img); $src_h = ImageSY($src_img); $can_img = imagecreatetruecolor($src_w, $src_h); $black = ImageColorAllocate ($olay_img, 0, 0, 0); ImageColorTransparent($olay_img, $black); imagecopy($can_img, $src_img, 0,0,0,0, $src_w, $src_h); imagecopymerge($can_img, $olay_img, 0,0,0,0, ImageSX($olay_img), ImageSY($olay_img),100); //Imagecopy won't work, you must used imagecopymerge ImageJPEG($can_img,'',100); imagedestroy($src_img); imagedestroy($olay_img); imagedestroy($can_img); partyheld
Fred wrote: <?php $file['signatur']= substr($result,0,3); $file['version']= substr($result,3,3); $file['width']= ord(substr($result,6,1))+ord(substr($result,7,1))*256; $file['height']= ord(substr($result,8,1))+ord(substr($rsult,9,1))*256; $file['flag']= ord(substr($result,10,1))>>7; $file['trans_red']= ord(substr($result,ord(substr($result,11))*3,1)); $file['trans_green']= ord(substr($result,ord(substr($result,11))*3+1,1)); $file['trans_blue']= ord(substr($result,ord(substr($result,11))*3+2,1)) ; ?> You should write such code like this: <?php $file = array( "signatur" => substr ($result, 0, 3), "version" => substr ($result, 3, 3), "width" => ord (substr ($result, 6, 1)) + ord (substr ($result, 7, 1)) * 256, "height" => ord (substr ($result, 8, 1)) + ord(substr ($result, 9, 1)) * 256, "flag" => ord (substr ($result, 10, 1)) >> 7, "trans_red" => ord (substr ($result, ord (substr ($result, 11)) * 3,1)), "trans_green" => ord (substr ($result, ord (substr($result, 11)) * 3 + 1, 1)), "trans_blue" => ord (substr ($result, ord (substr($result, 11)) * 3 + 2, 1)) ); ?> And there's a typo in line 4, sayin "rsult" instead of "result". I've got no time for checking your code any further, sorry. webmaster
After much devious mindbending, I have found a way to test any GIF for presence of background transparency. This ability is essential for my application which uploads any of GIF, JPEG or PNG and simultaneously creates a thumbnail of identical image type and identical filename (full size and thumbnail versions being stored in different folders). After uploading and moving the image in the usual way, a switch($image_type) statement ensures that the optimum code is used to generate the thumbnail; regardless of image type. The problem with the GIF type is that those with transparent backgrounds need to be treated differently to those without. When I don't detect GIF transparency, I either end up with all transparent GIF's having black backgrounds, or all GIF's get converted to transparent background - even if they weren't transparent in the original. But how to detect transparency in the original? It finally occurred to me that I could test for transparency programmatically by overlaying a copy of the original image over an all-black image, record the color value at particular pixel locations and then repeat the process by overlaying a copy of the original image over an all-white image, recording the color values at identical pixel locations and comparing these with the first set of values. If the two sets of values correlate exactly, and if sensible sampling points are used, the image can be treated as non-transparent. If the two sets of values show differences, the image should be treated as having a transparent background. joachim kruyswijk
A negative color number will turn antialiasing off, but even a positive number chosen for transparency may affect antialiasing. If the text (created with imagettftext) in your image looks horrible, try using a higher color number.
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