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Bug #30242 ...topalette creates 2 colors from 1 color image
Submitted: 2004-09-26 13:15 UTC Modified: 2004-11-19 11:20 UTC
From: pmpp at sapo dot pt Assigned: pajoye (profile)
Status: Closed Package: GD related
PHP Version: 4.3.9RC3 OS: Windows XP
Private report: No CVE-ID: None
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From: pmpp at sapo dot pt
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 [2004-09-26 13:15 UTC] pmpp at sapo dot pt
I create a truecolor image, fill it with 1 color, then I make that color transparent, but when I convert the image to palette, I get 1 pixel of a slightest different color of the first one, shifted 1pixel to the right of every pixel near a transparent pixel.

[GD Version] => bundled (2.0.28 compatible)

Reproduce code:
$image = imagecreatetruecolor(100,100) or die("");
$color = imagecolorallocate($image, 255, 229, 178);
imagefill($image, 0, 0, $color);
imagecolortransparent( $image, $color);
imagetruecolortopalette ( $image, 0, 255);

Expected result:
I expect to have all the image transparent.

Actual result:
With a more complex image, it's as I had moved a selection of the NON transparent image, full of a slightest different color of the one I made transparent, moved 1pixel to the right in the background.


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 [2004-11-19 11:20 UTC]
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
Thank you for the report, and for helping us make PHP better.

Fixed in head. 5.0 commit over the weekend.

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