Weird artifacts on photos after e_brightness with negative values

Memo Collectively

April 21, 2015 17:02

Hi,

I'm seeing ugly artifacts on multiple pictures after applying e_brightness with negative values. For example:

Original: http://res.cloudinary.com/dcv8s40r6/image/upload/v1427470857/xqo4xuplyjiike1cqwag.jpg

With e_brightness > 0: all ok, http://res.cloudinary.com/dcv8s40r6/image/upload/v1427470857/e_brightness:10/xqo4xuplyjiike1cqwag.jpg

With e_brightness < 0: broken, http://res.cloudinary.com/dcv8s40r6/image/upload/v1427470857/e_brightness:-10/xqo4xuplyjiike1cqwag.jpg

Interestingly, this works correctly if we use e_red, e_green and e_blue to the same effect: http://res.cloudinary.com/dcv8s40r6/image/upload/e_red:-20/e_green:-20/e_blue:-20/v1427470857/xqo4xuplyjiike1cqwag.jpg

Any hints as to why the brightness filter works that way?

Thanks,
-mk

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  Itay Taragano

  April 22, 2015 08:07

  Thank you for reporting about this. Our team is taking a deeper look at this issue.
  Regardless, please make sure the URLs follow the convention of placing the transformation string before the version component.

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  Itay Taragano

  March 17, 2016 08:05

  We now support a new brightness algorithm which should help for end cases like the image you referred to.
  This can applied by using the brightness_hsb effect mode (e_brightness_hsb in URLs).
  For example:
  http://res.cloudinary.com/dcv8s40r6/image/upload/e_brightness_hsb:-10/xqo4xuplyjiike1cqwag.jpg

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