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Old 07-13-2008, 02:05 PM   #1
NaCo
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Registered: Jun 2002
Location: L.A.
Distribution: Fedora
Posts: 46

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Talking Resizing images with white background


Hello community,

I am using the following script to resize .gif images; It works very decent:
------------------------------------------------------------------------
$src_img =imagecreatefromgif("bulb_gif.gif");
$srcsize = getimagesize('bulb_gif.gif');
$dest_x = 200;
$dest_y = (200/ $srcsize[0]) * $srcsize[1];//resize ratio.
$dst_img = imagecreatetruecolor($dest_x, $dest_y);

// Resize image
imagecopyresampled($dst_img, $src_img, 0, 0, 0, 0, $dest_x, $dest_y, $srcsize[0], $srcsize[1]);

// Output image
header("content-type: image/gif");
imagegif($dst_img);//imagejpeg($dst_img,"",85);

// Destroy images
imagedestroy($src_img);
imagedestroy($dst_img);

------------------------------------------------------------------------


The problem is when resizing images with white background (not transparency), after the script is executed the image background turns not being 100% white (255,255,255). Links:

Original .gif file: http://10-network.net/image_thumbial/bulb_gif.gif
Resized image: http://10-network.net/image_thumbial/index.php

You can notice the difference between the resized image and the page background. This varies from LCD to LCD, I can tell the difference in my main screen is about 75%, in othe screens I have around this is about 90%.

Any help will be gently apreciated.

Thank you.
 
Old 07-13-2008, 04:53 PM   #2
marozsas
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Registered: Dec 2005
Location: Campinas/SP - Brazil
Distribution: SuSE, RHEL, Fedora, Ubuntu
Posts: 1,437
Blog Entries: 1

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You are right ! Now only the white is not white (in fact it is #fcfefc) but the yellow has changed to. In the original image it is #f7c000 and in the small resized image it is #f4c204 !
I do not recognize the API you are using. What it is this API/language ?
For sure is a problem with the functions you are using.

Try to find a forum for that specific API and post your findings and/or try to contact the development team of that API.
 
Old 07-13-2008, 07:19 PM   #3
simonapnic
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Registered: Jul 2008
Posts: 70

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Post

It looks like you're using the ImageMagick library for your PHP script.
It could be a known bug, so check out their mailing lists, which are available at:
http://www.imagemagick.org/pipermail/
 
Old 07-14-2008, 03:10 AM   #4
NaCo
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Registered: Jun 2002
Location: L.A.
Distribution: Fedora
Posts: 46

Original Poster
Rep: Reputation: 15
Php Gd

Sorry, I totally forgot to mentioned what scripting language I am using, it is PHP (www.php.net/gd) with the GD library(www.libgd.org).

Yes this is somehow strange. I am not an expert using this library, being this the reason to seek some help.

It is not imagemagick it is GD.
 
  


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