ID: 18527
Updated by: [EMAIL PROTECTED]
Reported By: sogarthm at hotmail dot com
-Status: Open
+Status: Closed
Bug Type: Documentation problem
Operating System: N/A
PHP Version: 4.2.2
New Comment:
This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.
Thank you for the report, and for helping us make our documentation
better.
Previous Comments:
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[2002-07-24 03:25:07] sogarthm at hotmail dot com
This should be a pretty simple documentation addendum. I was working on
transparency with images, trying to get a bit of image blending to
display just right. It worked pretty well with GD 1.8.4, with a script
as follows:
<?
$baseImg = imageCreateFromPng("baseImg.png");
$sourceImg = imageCreateFromPng("sourceImg.png");
imageColorTransparent($sourceImg, imageColorAt($sourceImg, 0, 0));
imageCopy($baseImg, $sourceImg, 44, 124, 8, 8, 16, 16);
header("Content-type: image/jpeg");
imageJpeg($baseImg);
imageDestroy($sourceImg);
imageDestroy($baseImg);
?>
I didn't quite like the way the colours ended up, though, and decided
to try changing it to use GD 2.0.1 for true colour images. I tried it
with the same script, and it didn't work. I actually ended up trying
different things for several hours, along with doing several Google
searches and such trying to figure out how to get it to work. The only
hint I had was on the imageColorTransparent() manual page, where the
note by marshall.AT.byterage.net noted that he had it working, but
without specifying how...
Well, I finally figured it out (somewhat by chance). This is what's
necessary:
<?
$baseImg = imageCreateFromPng("baseImg.png");
$sourceImg = imageCreateFromPng("sourceImg.png");
imageColorTransparent($sourceImg, imageColorAt($sourceImg, 0, 0));
imageCopyMerge($baseImg, $sourceImg, 44, 124, 8, 8, 16, 16, 100);
header("Content-type: image/jpeg");
imageJpeg($baseImg);
imageDestroy($sourceImg);
imageDestroy($baseImg);
?>
You'll notice that instead of imageCopy(), I used imageCopyMerge().
This actually *does* work, contrary to what it says on the
imageCopyMerge() manual page: "When pct = 0, no action is taken, when
100 this function behaves identically to imagecopy()."
So, it would be great if at least two notes were added:
a) If on the imageCopyMerge() manual page, it would say that at pct =
100, it's identical to imageCopy() *for palette images only*, while it
implements alpha transparency for true colour images.
b) If on the imageColorTransparent() manual page, it noted that
transparency only copies with imageCopyMerge(), but not imageCopy().
Anyways, I'm filing this bug so that hopefully nobody else spends
several hours trying to figure out what's going wrong. Thanks!
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Edit this bug report at http://bugs.php.net/?id=18527&edit=1
