How can I darken my image?

There are several ways in which you can have your image darkened using Cloudinary.

Take the following image for example:

http://res.cloudinary.com/demo/image/upload/couple.jpg

You can adjust the opacity of the base image while setting the background to Black (or any other color):

http://res.cloudinary.com/demo/image/upload/b_black,o_20/couple.jpg

Alternatively, you can provide a negative value to the brightness effect as follows:

http://res.cloudinary.com/demo/image/upload/e_brightness:-80/couple.jpg

or the equivalent HSB based effect:

http://res.cloudinary.com/demo/image/upload/e_brightness_hsb:-80/couple.jpg