Camera Example: Reduce image resolution

[kedarm]

Hi!

I am using the Camera Example to capture and save an image on my Nokia N73.

As per the default settings, the image seems to be of fairly high resolution (1600x1200). Is there some way I can reduce the resolution of the image? Scale it down to 320x240?

I tried searching for CCamera::PrepareImageCaptureL() and CCamera::EnumerateCaptureSizes()as mentioned in the thread here, but I do not know where to find the aSizeIndex that will correspond to the resolution that I want and where I should make the changes.

In the file cameracaptureengine.cpp, is it sufficient to change the KImageSizeIndex from 1 (which is the second largest size) to something higher, like 3? Is there a table somewhere that corresponds KImageSizeIndex with image sizes?

Update:
I tried 3 which gave me an image of size 640x480. When I increased it even further to 4, I again got an image of size 1600x1200.
Any idea how to make the image even smaller?

Thanks
Kedar

[tamhanna]

Hi,
to be honest:

Why not use direct pixel processing or the Symbian image framework, or bitblt or sth like that.

When it comes to Symbian development, finding workarounds is the most important lesson...

[skumar_rao]

TCameraInfo::iNumImageSizesSupported Will give you number of sizes supported by camera. then you have to run a for loop CCamera::EnumerateCaptureSizes passing the number as a loop and you will get all supported image sizes.

[tamhanna]

TCameraInfo::iNumImageSizesSupported Will give you number of sizes supported by camera. then you have to run a for loop CCamera::EnumerateCaptureSizes passing the number as a loop and you will get all supported image sizes.

But don't expect these to be constant across all devices.

[TongMuan]

Update:
I tried 3 which gave me an image of size 640x480. When I increased it even further to 4, I again got an image of size 1600x1200.
Any idea how to make the image even smaller?

Hi,

If I remember correctly, N73 doesn't support resolution smaller than 640x480 for image capture, at least in EXIF format. However, the device does support 320x240 viewfinder bitmaps, so why not use the latest/next viewfinder frame instead of separately capturing an image. If you need the image in JPEG format, you can encode the frame using CImageEncoder.

-TongMuan