Instagram pixelating dslr images?

[Nicole]

I've recently started using Instagram as a photo diary, and loving photography I naturally want to upload some of my better images. However, Instagram pixelates the image and it becomes grainy and loses it's original colours. I'm aware that websites diminish the quality of photographs, but I also know it's possible to get the images better quality than what they are now.

I've attempted to change the dpi, the image size and I've unticked the box that says "use high-quality image processing." Any other suggestions? Perhaps in Photoshop? Thanks!