To adjust the general transparency of an image on your canvas - select it on your canvas, and click on the General Image Attribute option.
Reduce the value of the Transparency slider to lower the overall opacity of the image. Images, color or texture under the selected image will become visible.
There are more subtle ways to affect your image opacity and interaction with the canvas itself and other elements on your canvas.
Canvas Blend affects the manner in which your image interacts the images or colors underneath it.
To add a canvas blend, select an image., click on the General Attributes option, then choose one of the Canvas Blend options.
Gradients blend the image into the background from the edge outwards. Select your image, choose the Gradient option, and enable it. Adjust it as required.