I have wanted to see what goes on inside the mysterious engine of DxO Optics 5.3 so I took a test image and converted it with DxO with all the corrections off, and also converted it with UFRaw, doing my best to make them as close as possible.
The image was Shot on a Nikon D40 at ISO 1600 so that there would be a reasonable amount of noise in the image to see how well DxO handles noise in the conversion.
I used bilinear interpolation in UFRaw so that I could see if DxO did anything with the pixels that came from the camera as well as filling in the gaps between pixels of the same colour.
The first region is an out of focus light grey area. Firstly the DxO Conversion, then the UFRaw conversion
Now just the luma for each conversion:
And the difference between the two luma conversions:
Here I have enhanced the contrast and then split the image into different scales of detail. You can see there is some difference at scales larger than 1 or 2 pixels.
And the chroma:
The second area; A pile of thumb tacks.
The Luma of region 2:
Region 2 Chroma:
Region 3, pencils.
Region 3 Luma:
Region 3 Chroma:
Region 4, Out of focus black and white photo:
Region 4 Luma:
Region 4 Chroma: