I recommend this extension: Magic Pencil for Aseprite by Kacper Woźniak. It offers more practical brushes and real-time outline preview, making it incredibly useful.
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Kept what was written before as a memento, the simple script I once thought were useful during my newbie days.
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Applicable Scenes:
The Style with the simple black outline.
Quickly check the picture’s outline with a dark color.
Lua content:
local sprite = app.activeSprite
local cel = app.activeCel
if not sprite or not cel then
app.alert(‘Please select a layer and image first’)
return
end
-- Get the current image
local image = cel.image
local width, height = image.width, image.height
-- Creates an image larger than the original image. Used to add an outline
local outlineImage = Image(width + 2, height + 2)
local outlineColor = Color{ r=0, g=0, b=0, a=255 } -- black stroke. rgb is the colour, a is the transparency
-- Add a stroke around the image.
for y = 0, height - 1 do
for x = 0, width - 1 do
if image:getPixel(x, y) ~= 0 then
-- add outlines in all four directions
outlineImage:putPixel(x + 1, y, outlineColorr) -- up
outlineImage:putPixel(x + 1, y + 2, outlineColorr) -- down
outlineImage:putPixel(x, y + 1, outlineColorr) -- left
outlineImage:putPixel(x + 2, y + 1, outlineColorr) -- right
end
end
end
-- Draw the original image to the centre of the new image.
outlineImage:drawImage(image, 1, 1)
-- Apply the new image with the outline to the current layer
cel.image = outlineImage
-- move the coordinates of the new image up to the left, aligning the position of the original image
cel.position = Point(cel.position.x-1, cel.position.y-1)
-- Refresh the image
app.refresh()
