In all honesty, Converting an image to 360dpi for posting on the web is a waste of time. You only need resolutions that high if you are printing your pictures. Most computer monitors will only display an image at about 72.


Nevertheless your problem is more common than you might think. One thing that helps is monitor calibration, proper color space settings, how you actually process and save the image, as well as where you are uploading it.
Before you do anything make sure you have the Color Management is set appropriately so what you are seeing is more representative of what you will see on any monitor or once it is saved to Jpeg. The Internet Standard is sRGB, and since you're saving your pictures for display on the web, make sure the working color space is set to sRGB. as well as setting the color matching setting, for display set to sRGB.


Are you doing any kind of Noise Reduction?
In DPP click the tool icon and select the NR/Lens/ALO tab and tweek the Luminance and Chromatic Noise Reduction as needed on those high ISO pictures.


When you are converting your pictures with DPP what is the Quality Slider set on?
Typically to save space and keep the byte size of your pictures low you would turn it down, however, doing so also reduces the image quality. Often when you upload your images to some web sites as an attachment or a site with very limited space, they might also be using some kind of image compression which will degrade the quality of your image even more.





Is DPP the only Image editing / processing software that you are using?
I see you are also using Adobe Bridge, so I assume you also have Photoshop CS*. I would use that to do any noise reduction, resizing and conversion to jpeg instead of DPP. Color management suggestions above also apply to PS. (working with RAW files, the in camera Color Space setting doesn't matter what it is set to, only if you have the camera set to save you pictures as jpeg does that matter)


Have you tried any other Image hosts such as Photobucket.com or Flickr?


I use multiple image hosts to include Photoshop.com, Photobucket.com, Flickr, and Picasa(google). IMHO, Photobucket is the easiest of all those, and all you have to do is copy the link provided after you upload your image to post them in forums. When using an off site image host, you will be less likely to run into the problems you are describing.