---
updatedAt: 2025-05-08T22:54:59.000Z
agentTools:
  projectIndex: https://readme.blitline.com/llms.txt
---

# Terminology

What some non-obvious terms mean in Blitline

There are some image processing terms that may not make sense to those unfamiliar with ImageMagick or Blitline.

## GRAVITY

Gravity defines where a selection should be placed within the context of an image.

For example: WestGravity would mean "left-align" the image

There are 10 different possible gravity settings:

* CenterGravity
* NorthWestGravity
* NorthGravity
* NorthEastGravity
* EastGravity
* SouthEastGravity
* SouthGravity
* SouthWestGravity
* WestGravity

## COMPOSE OPERATIONS

During a composite operation (which overlays one image on top of another), there are many different ways the images can be combined together.

You can read more about them here: <https://legacy.imagemagick.org/Usage/compose/>

Generally you will normally just use the defaults.