From: [EMAIL PROTECTED]
Operating system: N/A
PHP version: 4.2.2
PHP Bug Type: Documentation problem
Bug description: Misleading info: imageCopyMerge(), imageColorTransparent(), and true
colour
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!
--
Edit bug report at http://bugs.php.net/?id=18527&edit=1
--
Fixed in CVS: http://bugs.php.net/fix.php?id=18527&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=18527&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=18527&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=18527&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=18527&r=support
Expected behavior: http://bugs.php.net/fix.php?id=18527&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=18527&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=18527&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=18527&r=globals
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