Android Question Cameraex Class: front camera pictures are very dark

M

mitobobo

Member
Licensed User
Longtime User
Dear,

Pictures took with front camera through Cameraex class are very dark. However, if I use the default Android camera or any other app which takes picture, the pictures are fine. I think it's a problem of exposure, so I tried to add this in the Cameraex class:

B4X: 
Public Sub SetExposureCompensation(Value1 As Int)
  r.target = parameters
  r.RunMethod4("setExposureCompensation", Array As Object(Value1), _
      Array As String("java.lang.int"))
End Sub

and I use this in my activity to set exposure:

B4X: 
camEx.SetExposureCompensation(2)
(I know "2" is a supported value on my phone)

However, nothing changes: picture is still as dark as before

B4X: 
camEx.SetParameter("setExposureCompensation", "2")
doesn't work as well.

Any idea how can I solve it?

Any help would be much much much appreciated! Thanks so much.
 
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M

mitobobo

Member
Licensed User
Longtime User
I'll never stop saying how helpful this forum is! Thank you so much, Erel. I just had to start camera preview and then let the app wait for 2 seconds so that it can adjust while level, I suppose. If you take a photo immediately after the preview is started, the photo will be dark. So a timer is just the solution. Thank you again! Happy Easter.
 
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M

mitobobo

Member
Licensed User
Longtime User
Nothing hard. I didn't even need to set WHITE_BALANCE_AUTO = "auto" or SCENE_MODE_AUTO = "auto".
B4X: 
camEx.Initialize(pnlContent, frontCamera, Me, "Camera1")

Sub Camera1_Ready (Success As Boolean)
Log("Camera1_Ready?" & Success)
    If Success Then
camEx.StartPreview
Timer1.Initialize("CameraTimer", 2000)
Timer1.Enabled = True

End Sub

Sub CameraTimer_Tick

camEx.TakePicture
Timer1.Enabled = False

End Sub

In my case, a 2 seconds timer is just enough for the camera to auto-balance.
 
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