Magento 1.9 – Watermark Gets Black Background When Transparent

magento-1.9patchessupee-9767watermark

I've installed PATCH SUPEE 9767 on my magento 1.9.2.4 shop.

Now i've uploaded a new Watermark but the background changes to black.

Is this a problem since the new update? On a other magento 1.9.2.4 installation where the update isn't installed there is the background still transparant.

Best Answer

I had the same issue after patching 1.9.2.2 and 1.9.2.3. SUPEE-9767 adds an extended validate method in

app/code/core/Mage/Core/Model/File/Validator/Image.php

Mine was:

public function validate($filePath)
{
    $fileInfo = getimagesize($filePath);
    if (is_array($fileInfo) and isset($fileInfo[2])) {
        if ($this->isImageType($fileInfo[2])) {
            return null;
        }
    }
    throw Mage::exception('Mage_Core', Mage::helper('core')->__('Invalid MIME type.'));
}

And changed to:

public function validate($filePath)
{
    list($imageWidth, $imageHeight, $fileType) = getimagesize($filePath);
    if ($fileType) {
        if ($this->isImageType($fileType)) {
            //replace tmp image with re-sampled copy to exclude images with malicious data
            $image = imagecreatefromstring(file_get_contents($filePath));
            if ($image !== false) {
                $img = imagecreatetruecolor($imageWidth, $imageHeight);
                imagecopyresampled($img, $image, 0, 0, 0, 0, $imageWidth, $imageHeight, $imageWidth, $imageHeight);
                switch ($fileType) {
                    case IMAGETYPE_GIF:
                        imagegif($img, $filePath);
                        break;
                    case IMAGETYPE_JPEG:
                        imagejpeg($img, $filePath, 100);
                        break;
                    case IMAGETYPE_PNG:
                        imagepng($img, $filePath);
                        break;
                    default:
                        return;
                }
                imagedestroy($img);
                imagedestroy($image);
                return null;
            } else {
                throw Mage::exception('Mage_Core', Mage::helper('core')->__('Invalid image.'));
            }
        }
    }
    throw Mage::exception('Mage_Core', Mage::helper('core')->__('Invalid MIME type.'));
}

The problem seems to be the imagecopyresampled call without setting transparency first as it merges the default black background from imagecreatetruecolor.

What I did was move imagecopyresampled into the switch statement and add the transparency calls before imagecopysampled in the png case (you could also use it for gif).

So now my if/switch looks like this:

if ($image !== false) {
    $img = imagecreatetruecolor($imageWidth, $imageHeight);

    switch ($fileType) {
        case IMAGETYPE_GIF:
            imagecopyresampled($img, $image, 0, 0, 0, 0, $imageWidth, $imageHeight, $imageWidth, $imageHeight);
            imagegif($img, $filePath);
            break;
        case IMAGETYPE_JPEG:
            imagecopyresampled($img, $image, 0, 0, 0, 0, $imageWidth, $imageHeight, $imageWidth, $imageHeight);
            imagejpeg($img, $filePath, 100);
            break;
        case IMAGETYPE_PNG:
            imagecolortransparent($img, imagecolorallocatealpha($img, 0, 0, 0, 127));
            imagealphablending($img, false);
            imagesavealpha($img, true);
            imagecopyresampled($img, $image, 0, 0, 0, 0, $imageWidth, $imageHeight, $imageWidth, $imageHeight);
            imagepng($img, $filePath);
            break;
        default:
            return;
    }
    imagedestroy($img);
    imagedestroy($image);
    return null;
}

This kept my png transparency during product image uploads. Dont know if this will help with the watermark and obviously if you do use this copy the file into your local folder.

app/code/local/Mage/Core/Model/File/Validator/Image.php

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