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[Florian Boucault <florian.boucault@xxxxxxxxxxxxx>]

** Changed in: camera-app (Ubuntu)
     Assignee: (unassigned) => Florian Boucault (fboucault)

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https://bugs.launchpad.net/bugs/1519766

Title:
  HDR fail on patterned high contrast image

Status in Canonical System Image:
  In Progress
Status in camera-app package in Ubuntu:
  In Progress

Bug description:
  Meizu MX4 Ubuntu Touch rc-proposed r178

  camera app v. 3.0.0.604

  Background: I was taking general forest shots successfully and then
  tried a close-up of a frost dusted spider web. Capture animation
  displayed but nothing got shown in Photo Roll aside of the Ubuntu
  spinner. General shots still succeeded. This happened twice in field,
  second time with frost dusted, repetitively patterned moss. This was
  version v3.0.0.595.

  Reproduction: place black mosquito net over back-lighted opaque
  perspex and photograph from 15-20 cm distance (see attachment), with
  HDR function enabled and phone held steady.

  Expected outcome: image captured.

  Actual outcome: no image shown in Photo Roll. .Jpeg image file is
  present in Pictures but corrupt (see attachment), even if viewed on
  PC. For me, this result is invariable with my test image setup.

  It appears that regularly patterned, high contrast scenes cause the
  HDR routine to "choke". A few months back I saw this with HDR in a
  high contrast general scene without realising what caused it. Note,
  camera shake under HDR results in captured image.

  With  Camera v. 3.0.0.595, the issue would persist even with normal
  shots after the HDR one. With v. 3.0.0.604 disabling HDR allows image
  to be captured.

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