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Dynamically Transparent Gif's


Basically what i would like to do is dynamically set the transparency of a selection of images (GIF'S) depending on variables set in a My SQL Database. What i need to do is tint some jpg,s by setting the transparency of a solid blue gif which is set over the top of it in a table.




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PHP (GD) Created Transparent PNG: AlphaImageLoader Makes Black Parts Transparent Instead Of Transparent Color Set With PHP
I have a problem with PHP (GD) created transparent PNG and Microsofts
AlphaImageLoader.

You will immediately see what the problem is if you view
http://www.useful-scripts.biz/test/.../transpng_2.php with IE 7
or Firefox and then with IE 6. It seems that the AlphaImageLoader
works correctly on a PNG image that has been created with an image
processor and then uploaded, but not with a PNG image created with
PHP. It seems to ignore the transparent color set with PHP and instead
to render the black color transparent.

The image in question was created using this code:

<?php
$source = imagecreatefrompng("parrot_orig.png");
$transp = imagecolorallocate($source,255,0,0);
imagecolortransparent($source,$transp);
imagefilledrectangle($source,15,15,70,70,$transp);
imagepng($source,"parrot_php.png");
?>

The HTML used on the page is this:

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What is the easiest way to do this?

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Using this code to resize a .gif file and then place it in another dir. The file appears in the correct location and gets resized however it is black..... this code works fine for jpegs when imagegif is changed to imagejpeg etc.

Any ideas on a way round this or some code what resizes gifs that works would be great too..

<?php

$new_width = 300;
$new_height = 250;
$imgname = "test.gif";
$size = GetImageSize("$imgname");
$img_in = imagecreatefromgif("test.gif");
$img_out = imagecreate($new_width, $new_height);

ImageCopyResized($img_out, $img_in, 0, 0, 0, 0, $new_width, $new_height, $size[0], $size[1]);
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?>

<img src=test.gif>
<img src=tempimages/testsmall.gif>

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Wondering if anyone else has had problems with gifs created by php or if
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Symptom: created jpegs work fine and created gifs work fine in Netscape and
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IE displays gif fine *via internet* BUT off of a CD or local HTML file it
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I have run a dozen gifs through the process and it has happened to every one
of them.

function thumbnail ($src_file, $path) {
$orig = $path . '/' . $src_file;
list($w,$h,$type) = getimagesize($orig);
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$thmb_and_path = $path . $name;
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$thmb_and_path = $path . $name;
if(!file_exists($thmb_and_path)) {
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$dest_height= 80;
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return $thmb_and_path;
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I want to resize uploaded GIF images. Currently I do it like this:

<?php
// ...
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?>

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anyone sees a problem with this code.

Symptom: created jpegs work fine and created gifs work fine in Netscape and

Firefox and when directly viewed.

IE displays gif fine *via internet* BUT off of a CD or local HTML file it

won't display the file.

function thumbnail ($src_file, $path) {
$orig = $path . '/' . $src_file;
list($w,$h,$type) = getimagesize($orig);
if ($type == 2) { // jpeg
$src_img = imagecreatefromjpeg("$orig");
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$src_height = $image_info[1];
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imagedestroy($src_img);
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} else if ($type == 1) { // gif
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$image_info = getimagesize($orig);
$src_width = $image_info[0];
$src_height = $image_info[1];
$dest_height= 80;
$dest_width = ($dest_height/$src_height) * $src_width;
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imagejpeg($dst_img, $thmb_and_path, $quality);
chmod("$thmb_and_path", 0777);
imagedestroy($src_img);
imagedestroy($dst_img);
}
}
return $thmb_and_path;
}

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Transparent GIF
I am trying to resize transparent GIF images, so I was reading, and they say to use fopen, fread, and read the first 13 bytes... OK, so I read in a transparent gif, and the first 13 bytes... and echo it out to the screen, and I get this: GIF89a›&#65533;s&#65533;÷&#65533;&#65533;What am I supposed to do with that? they then say "allocate that color as transparent, and use imagecopy(); to set the transparency back."

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Transparent .png
This isn't totally related to php, but I am using a php generated page that is using transparent .png's.

Anyway, when I view the page in Internet Explorer, the transparency within the png is replaced with grey?? But when I view it in Firefox it works fine?

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Transparent Image
Hi!

Here's a piece of code:

[begin]

<?php

Header('Content-type: image/png');

$sz = "";

$FileValue = 1000;

$i = strlen($FileValue);

for ( $j = 0; $j < 7-$i; $j++ )
{
$sz = $sz . "0";
}

$Img = imagecreate(56,13);

$Gold = imagecolorallocate($Img,148,128,100);

$Gray = imagecolorallocate($Img,32,32,32);

ImageFilledRectangle($Img,0,0,55,12,$Gray);

imagestring($Img,4,0,0,$sz.$FileValue,$Gold);

imagepng($Img);

ImageDestroy($Img);
?>

[end]

OK. Calling this script I have a png picture back.

Now I add imagecolortransparent($Img,$Gray); just before imagepng() and OK
again, I have a transparent picture back. But now, if I add:

$r = imagerotate($Img,90,0);

imagepng($r);

just after the imagecolortransparent() instruction seen above, I get a
rotated picture, but not transparent. How to solve that? I've used a plenty
of tricks, no one works.

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I have a basic script to resize a transparent png image. Code:

$dimg = imagecreatetruecolor($newwidth, $newheight);
imagecolortransparent($dimg, imagecolorallocate($dimg,0,0,0));
imagealphablending($dimg, false);
imagecopyresampled($dimg, $simg, 0, 0, 0, 0, $newwidth, $newheight, $currwidth, $currheight);


Problem is that my nice drop shadows are lost in resize. Does anyone know how I can keep them ?

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Transparent Background
i'll try to explain myself the best i can, here is the problem:

i have a html page and inside this i want to put an iframe that contains a php page. That's ok, i can do it and it works, but the problem is that i can't make that php document to have transparent background.

it turns white. Is it because of the iframe? the php document has transparent background, but when i see it inside the iframe it doesn't work.

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Two Transparent Colours
I have an image that I am opening and then merging onto another image, and it has two colours which I wish to make transparent, but it is not working, can you please give me an example of how to do this thanks. When I say that it is not working, I mean that when I allocate the second one, the first one is no longer transparent.

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Is it possible to overlay a transparent watermark on an image -
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I'd like the result to look like this example:
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That is a bit of overkill, but you can see what I mean. The watermark
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I tried using a class from phpclasses.org
<http://www.phpclasses.org/browse/package/1580.html...
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I found one other method through Google,
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Can this kind of transparent overlay be done on the fly with GD lib?

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$transparentColor = imagecolorallocatealpha($image, 255-$r, 255-$g, 255-$b, 127);
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$background = imagecolorallocate($image, $br, $bg, $bb); .......

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Does anybody know if there's an easy way to find out if a given image is a transparent gif? (GIF89a)

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Actually, I now what in theory should be done. I should change the r,g,b values of the color that has aplha=127 (and that's not a problem with imagecolorset()), but also I should change the alpha of that color to 0. how can that be done ? My quess is that that is the right way to do it.

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Is there an easy way of overlaying transparent images in the GD library, so that the original image is merged in such as way that it can be seen through the watermark? Code:

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