CMYK images cannot be viewed over the web. This article explains how to convert an image from the CMYK to RGB color space for web viewing.
Starting with version 1.5, AspJpeg is capable of converting JPEG and TIFF images created in the CMYK color space to JPEG images in the RGB color space. The conversion is performed by calling the ToRGB method which accepts no arguments and returns no values. If the image being converted is not a CMYK, the method will simply do nothing.