"Align Visible Layers" allows you to position visible layers (with the eye
icon turned on) very precisely. This precision in not useful on usual
image editing; it is much more useful when working on animations, with
many small layers. By clicking on this command, you open a dialog
containing many alignments settings.
Note
In Gimp-1.2, the default alignment base was the upper visible layer in
the stack. In Gimp-2, this default alignment base is now the canvas
edge. You can still align on the bottom layer of the stack, even if it
is invisible, by checking the "Use the (invisible)bottom layer as the
base" in the dialog.
Figure 10.84.
Image for examples
Image for example: four layers on a large canvas 150x150 (they might
be images): red is 10x10 pixels, green is 10x20 and yellow is 20x10.
The background layer (blue:100x100) will not move, as the "Ignore
lower layer" option will be checked. Note that, because of their
position on canvas, layers in image seem to have an order different
from the order in stack (the yellow layer is the top layer in image
and is second in stack).
10.58.1.
Activate Dialog
This command can be accessed from an image menubar as
Layer → Align Visible layers.
There is no default shortcut.
10.58.2.
The “Layer Align” dialog
Figure 10.85.
The “Layer Align” dialog
La fenêtre de dialogue “Aligner les calques visibles”
Horizontal/Vertical Style
This option controls how layers are horizontally/vertically moved
in relation to each other:
None:
No change in horizontal/vertical position.
Collect:
This option aligns the selected "Horizontal/Vertical base"
(Left edge, Centre, Right edge / Top edge, Center, Bottom
edge) of every visible layer onto the canvas left/top edge. If
you select Right Edge, layers disappear from the canvas; you
can see them again by enlarging the canvas.If the "Bottom
Layer as Base" option is checked, layers are aligned on the
left/top edge of the bottom layer.
Figure 10.86.
Horizontal collecting alignement (on canvas edge)
Original image with layer stack
Layers have moved horizontally to align their left edge
onto the left edge of the canvas.
Figure 10.87.
Horizontal collecting alignment (on bottom layer)
Original image with layer stack
Layers have moved horizontally to align their left edge
onto the bottom layer left edge.
:
Fill (left to right / Top to bottom)
This option places the selected base of visible layers
regularly, horizontally / vertically on the image, in the top
to bottom order of the stack. The upper layer in the stack is
placed on the leftest (uppest) position in the image. The
lower layer in the stack is placed on the rightest (lowest)
position in the image. Other layers are placed regularly
between both positions. If the "Bottom layer as base" option
is checked, the layer base is aligned onto the corresponding
edge of the bottom layer.
Horizontal filling alignment, Left to Right, "Bottom
layer as base" unchecked. The green layer, first in
stack, is placed on the left horizontal position that
was that of the yellow layer. The red layer is placed on
the right horizontal position that was that of the green
layer. Note the regular spacing between base layers and
the layer horizontal order, that of the Layer Dialog
stack.
Horizontal filling alignment, Left to Right, Bottom
Layer as base (blue).
Fill (right to left / Bottom to top):
As above , this function reads layer stack from top to
bottom, but displays layers right to left, bottom to top,
regularly.