arw 2 tiff convertion

[aby-xto]

I found some strange thing with arw files of Sony a350 (image size 4600*3068):
(1) if I’m converting arw file to tiff in “view mode” using “save as”, it convert it good (i.e. image size still 4600*3068)
(2) if I’m using browser’s “batch processing” or “import”, the image size of resulted tiff files become 2300*1524 (i.e. 50%)
Just the same during convertion to jpeg or some other formats.

I need to convert many images and it is difficult to convert them one by one in “view mode”.
If there any suggestions how to convert arw files to tiff correctly in “batch processing”?