I never noticed this before. In a CS4 InDesign document (CMYK transparency blend space) when I apply a basic feather to a greyscale photo the photo becomes noticeably lighter. This washed out effect is very undesirable. When I export a high quality PDF the photos also look muted. I have not noticed this with RGB photos. Does anyone have a suggestion on how to avoid this? I searched the web for an explanation without any luck. Thanks.