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Functions used in image.module vs. img_assist.module (simplified):

image.module:

• image_display()
  • is called for galleries, image nodes, image blocks, etc (everytime in image is shown)
  • returns <span ...><img ...></span>
  • can be passed a specific standard size only
  • may call _image_build_derivatives()
  • calls theme_image() to create the <img> tag

_image_build_derivatives()

• rebuilds all standard image sizes for a particular node

img_assist.module: (more complicated, but more flexible)

• image_display()
  • is called for thumbnails browsing, inline images, etc (everytime in image is shown)
  • returns <span ...><img ...></span>
  • can be passed EITHER a specific standard size only OR a custom size
  • may call _image_build_derivatives()
  • calls theme_image() to create the <img> tag

_image_build_derivatives()

• rebuilds only a specfic image size (standard or custom size)

Functions

Name	Location	Description
img_assist_display	img_assist/img_assist.module	Create an IMG tag for an image.
img_assist_render_image	img_assist/img_assist.module	Return image HTML.
_img_assist_build_derivatives	img_assist/img_assist.module	Generate a image derivative See also_image_build_derivatives() in image.module