It is most effective with G3, G5, G6, S45, S50, S60, S70, D30, D60, 10D and 300D images which contain 36-bits per pixel but it is also useful with G2, S30 and S40 raw files which contain 30-bits per pixel. "Combined" conversion isn't suitable for all images but it can be very effective with slightly over-exposed images. "Combined" conversion is useful for shots which are slightly over exposed and shots with a lot of highlight detail. This can result in images that look poorly focused and is simply because the image has not been sharpened. Canon's raw conversion routines do not allow the saturation, contrast and sharpness to be adjusted when using linear conversion. The image will appear very dark because it has a gamma value of 1.0 from the camera and has not been adjusted to a gamma of 2.2 normally used for displaying images on a PC screen. This takes the raw sensor data and only applies white balance correction. Select "Linear" conversion to convert the raw file with the minimum of post processing.
This uses the standard Canon raw conversion routines and allows you to set the white balance, saturation, contrast and sharpness. Select "Normal" conversion for normal, well exposed shots. If "Linear" or "Combined" conversion is selected for G1 or Pro90 raw files they will be converted using "Normal" conversion. All three conversion modes are available for 20D, 350D, 10D, 300D, D30, D60, G2, G3, G5, S30, S40, S45, S50, S60, S70 and Pro1 raw files but only "Normal" mode is available for the G1 and Pro90. The raw conversion method can be set to "Normal", "Linear" or "Combined". The screenshot below shows the raw conversion dialog for the Canon EOS 10D: Different cameras allow different raw conversion adjustments and so the contents of the raw conversion dialog will vary according to the camera model. Select the "Convert Raw Image" menu option or press the "Convert" button to display the Raw convert dialog.
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