ID:               40158
 User updated by:  henus at mail dot ru
 Reported By:      henus at mail dot ru
 Status:           Open
 Bug Type:         GD related
 Operating System: Windows XP
 PHP Version:      5.2.0
 Assigned To:      pajoye
 New Comment:

i expect absolutely black image like
http://www.fort-ross.ru/henus/gd/result_correct.png
instead of 
http://www.fort-ross.ru/henus/gd/result_incorrect.png

i use colorizing by black for clearness.


Previous Comments:
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[2007-01-18 18:11:31] henus at mail dot ru

correction fo my previous post about
php-5.2.0\ext\gd\libgd\gd.c 



Lines 3682-3688:
new_pxl = gdImageColorAllocateAlpha(src, (int)r, (int)g, (int)b, a);
if (new_pxl == -1) {
        new_pxl = gdImageColorClosestAlpha(src, (int)r, (int)g, (int)b, a);
}
if ((y >= 0) && (y < src->sy)) {
        gdImageSetPixel (src, x, y, new_pxl);


in gdImageSetPixel src should be absolutely transparent, with 
alpha=127
differently it mix colors.

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

[2007-01-18 18:09:31] [EMAIL PROTECTED]

Please provide an *image* showing what you expect.

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

[2007-01-18 17:56:25] henus at mail dot ru

i create black image and overlay it by colorized
white-truecolor-png24-image ( http://fort-ross.ru/henus/gd/mask.png )
 
the result of colorize like:
imagefilter($mask, IMG_FILTER_COLORIZE, -255, -255, -255);
is image:
http://www.fort-ross.ru/henus/gd/result_incorrect.png 
which contain artefacts...



also, the result of such script (
http://fort-ross.ru/henus/gd/demo2.phps )
is:

is truecolor - 1
before - Array ( [red] => 255 [green] => 255 [blue] => 255 [alpha] =>
63 ) 
wrong result, using filter - Array ( [red] => 126 [green] => 126 [blue]
=> 126 [alpha] => 31 ) 
wrong result, using imagecolorallocatealpha and imagesetpixel - Array (
[red] => 126 [green] => 126 [blue] => 126 [alpha] => 31 ) 
correct result, using imagefill, imagecolorallocatealpha and
imagesetpixel - Array ( [red] => 0 [green] => 0 [blue] => 0 [alpha] =>
63 )

I.e.
colorizing pixel ( [red] => 255 [green] => 255 [blue] => 255 [alpha] =>
63 ) to black 
should be with ( [red] => 0 [green] => 0 [blue] => 0 [alpha] => 63 ), 
not  ( [red] => 126 [green] => 126 [blue] => 126 [alpha] => 31 )

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

[2007-01-18 15:22:49] [EMAIL PROTECTED]

Can you provide an image to show what you expect?

I did not check your script but having an image will help to really
understand what you are trying to achieve.

By the way, filters work only with truecolor images, allocate will
never fail.

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

[2007-01-18 14:26:28] [EMAIL PROTECTED]

>...should be without alpha...
Could you plz elaborate?
A unified diff would explain it much better, btw.

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

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the rest of the comments, please view the bug report online at
    http://bugs.php.net/40158

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