Locking Channels

Locking color channels allows you to suppress changing of every color channel separately: red, green, blue and alpha.

For example, if you want to save the contour of an image, you must enable locking of alpha channel:

original image

alpha channel is not locked

alpha channel is locked

The lock channel buttons uses the following modifier effects:

• select
• pen
• line
• rectangle
• filled rectangle
• ellipse
• filled ellipse
• polyline
• polygon
• text