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I have installed patch SUPEE-9767 on 1.9.2.1 store, Now the new products images is having a black color around it. I attached a sample product image.

I have tried this fix

Watermark get black background when transparent

but the problem is after I update the new code in Validator/Image.php I cannot upload images from the admin, I can use the browse button and click Upload but after that it's just showing 'uploading' forever

Would some one advice me how to fix this issue

product image

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I have encountered this bug as well. I have applied a fix to the Mage_Core_Model_File_Validator_Image class and was looking for a place to submit a bug report and patch for this.

In between lines 96 and 97, I have added this small check for PNG and GIF type images to preserve the alpha channel of the image:

if ($fileType == IMAGETYPE_GIF || $fileType == IMAGETYPE_PNG) {
    imagecolortransparent($img, imagecolorallocatealpha($img, 0, 0, 0, 127));
    imagealphablending($img, false);
    imagesavealpha($img, true);
}

I have tested this and can confirm it works when adding images to a product from the catalogue view. If you implement this, please let me know if it works for you as well.

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