Which technique helps to distinguish an object from its surroundings?

How would understanding the value scale with color you with creating your artwork.

Blind contour line drawings are : a. often used to paint landscapes b. often detailed but not perfect c. often detailed and flawless

Ineed this to be answered fast and you i would appreciate it1. what benefits are there to using an online filter app? 2. of the apps you researched, which would you choose to edit your own photos? why would you choose this app over the other ones? 3. if you could choose between using the camera accessory filters that connect to your camera or the photo editing app filters, which would you choose and why?