Why does face recognition eliminate the alpha channel?

Todd Agulnick

February 27, 2014 01:50

Hi,

If I start with a PNG image with transparency for the background, generating a transformation using :crop => :thumb and :gravity => :face turns the transparent pixels into black pixels.

Is this a bug? Is there a work-around that maintains the transparent pixels?

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  Itay Taragano

  February 28, 2014 21:43

  Hi Todd,

  Can you please share an example with us so we'll be able to further investigate this?

  Thanks.

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  Todd Agulnick

  March 03, 2014 21:30

  Sure! How about this:

  Original image: https://res.cloudinary.com/hb3rxe9xf/image/upload/v1390949516/akkbaypalx3pesi7srzq.png

  After face detection/cropping: https://res.cloudinary.com/hb3rxe9xf/image/upload/c_thumb,g_face,h_100,r_10,w_100/v1390949516/akkbaypalx3pesi7srzq.png

  Note the transparent background in the original image and how the background turns black in the cropped image. If the url doesn't specify g_face, the transparent pixels remain.

  -Todd

   

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  Itay Taragano

  March 06, 2014 13:39

  Thank you for sharing the image.

  We'll further investigate this and will update you

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  Itay Taragano

  March 11, 2014 10:02

  Hi Tony,

  The issue is now fixed:

  https://res.cloudinary.com/hb3rxe9xf/image/upload/c_thumb,g_face,h_100,r_10,w_100/v1390949518/akkbaypalx3pesi7srzq.png
  
  

  Thanks again for reporting about this.

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