You are able to create filters on the image just by clicking on the link under the Color drop down.
To apply a black and white filter, click the Convert to Black and White link on the left.
To remove the black and white filter, click the Convert to Black and White link on the left again.
To apply a grey scale to your image, click the Convert to Greyscale on the left.
To remove the grey scale filter, click the Convert to Greyscale on the left again.
To apply a negative filter to your image, click the Convert to Negative on the left.
To remove the negative filter, click the Convert to Negative on the left again.
To apply a sepia filter to your image, click the Convert to Sepia on the left.
To remove the sepia filter, click the Convert to Sepia on the left again.
To apply a solarize filter to your image, click the Convert to Solarize on the left.
To remove the solarize filter, click the Convert to Solarize on the left again.