All models introduced before 2010 use RGBG Bayer filter (except the original Digital IXUS, which uses a CYGM filterCanon Digital IXUS 300 (DPReview)) CCD sensors made by Sony. IXUS 300 HS/PowerShot Digital ELPH SD4000 IS/IXY 30S introduced in May 2010 and all following models have back-illuminated CMOS sensor. Images are recorded as JPEGs. Raw image files are not accessible without the use of third party firmware such as CHDK.
