Camera Wrapper and Snapshot Jpeg Quality

[NevenS]

Hello,

I am using the Nokia Camera Wrapper (http://www.forum.nokia.com/info/sw.n..._0_en.zip.html) to capture snapshot images.

It all works well my N96 phone, but I have noticed that setting the Jpeg quality has no effect.
Here is a code sample (note that I only wish to show how I'm setting the jpeg quality, not post the whole initialization code here):

CCameraEngine* cameraEngine;
int jpegQuality = 50;

// Set the quality.
TRAPD( serr, cameraEngine->Camera()->SetJpegQuality(jpegQuality) );
if (serr != KErrNone) 
    return _error( ERR_CAMERA_FAILED, L"failed to set jpeg quality" );

// I even check if the quality has been set.
if (cameraEngine->Camera()->JpegQuality() != jpegQuality)
    return _error( ERR_CAMERA_FAILED, L"failed to set jpeg quality" );

// Start the snapshot.
TSize sz(2048, 1536);
cameraEngine->PrepareL( sz );
cameraEngine->CaptureL();

The captured Jpeg snapshot is always relatively big (some 2-3 MB for a 3 Megapixel snapshot) and it does look "good" so I guess the camera wrapper always uses the maximum Jpeg quality.

The docu of CCameraEngine states:

  /**
   * Returns a pointer to CCamera object used by the engine.
   * Allows getting access to additional functionality
   * from CCamera - do not use for functionality already provided
   * by CCameraEngine methods.
   */
  IMPORT_C CCamera* Camera();

Since I have not found any function to set the snapshot quality in CCameraEngine, I guess I should be able to use the CCamera's one.

How can I set the jpeg quality when using CCameraEngine? Directly access the CCamera's one? Or is there is no way to set it (CCameraEngine always shoots with 100% quality)?

[tamhanna]

Hello,

I am using the Nokia Camera Wrapper (http://www.forum.nokia.com/info/sw.n..._0_en.zip.html) to capture snapshot images.

It all works well my N96 phone, but I have noticed that setting the Jpeg quality has no effect.
Here is a code sample (note that I only wish to show how I'm setting the jpeg quality, not post the whole initialization code here):

CCameraEngine* cameraEngine;
int jpegQuality = 50;

// Set the quality.
TRAPD( serr, cameraEngine->Camera()->SetJpegQuality(jpegQuality) );
if (serr != KErrNone) 
    return _error( ERR_CAMERA_FAILED, L"failed to set jpeg quality" );

// I even check if the quality has been set.
if (cameraEngine->Camera()->JpegQuality() != jpegQuality)
    return _error( ERR_CAMERA_FAILED, L"failed to set jpeg quality" );

// Start the snapshot.
TSize sz(2048, 1536);
cameraEngine->PrepareL( sz );
cameraEngine->CaptureL();

The captured Jpeg snapshot is always relatively big (some 2-3 MB for a 3 Megapixel snapshot) and it does look "good" so I guess the camera wrapper always uses the maximum Jpeg quality.

The docu of CCameraEngine states:

  /**
   * Returns a pointer to CCamera object used by the engine.
   * Allows getting access to additional functionality
   * from CCamera - do not use for functionality already provided
   * by CCameraEngine methods.
   */
  IMPORT_C CCamera* Camera();

Since I have not found any function to set the snapshot quality in CCameraEngine, I guess I should be able to use the CCamera's one.

How can I set the jpeg quality when using CCameraEngine? Directly access the CCamera's one? Or is there is no way to set it (CCameraEngine always shoots with 100% quality)?

Hi,
this being Nokia, I would not hold my breath for a bug fix.

Instead, I would just reencode the file on the go. But - seriously, if you get the files in 100% quality, let them be in that way. Hundreds of customers would pay for an app which offers them that!