I've seen examples of images in PDF that have BitsPerComponent=8, with an Indexed Color Space, but the filter is DCTDecode. This doesn't seem intuitive to me, as JPG supports 24-bit RGB and 8-bit gray. I haven't heard of 8-bit color JPG so I'm just wondering how this is done?
I'm just trying to understand how this works if someone could please indulge me with a technical explanation it would be most appreciated. I understand how the image is represented using the colorspace, I just don't understand how this filter is applicable to 8-bit data.
Please note, I understand that it's not an actual JPG file, that the data is only using the compression scheme.