Automatic de-upscaling 🎈

Features
1

This would be a really sweet QOL feature. A feature that automagically :star2: detects the upscaling and converts back to original scale :rainbow::tada::pray:

2

I have a script that does exactly that. I’ll update this post later with it.

UPDATE:

Here’s the script, I never posted it anywhere because I wasn’t sure its use case is very common. Right now it only works on a single cel (one layer, one frame) and requires a clean image - JPGs won’t work, trust me, I tried.

if app.activeSprite == nil then return end

-- For simplicity, for now just take into account the image from the active cel
local image = app.activeCel.image

-- First, go throught each row - look for the narrowest part that doesn't change color
local narrowest = image.width

for y = 0, image.height - 1 do
    local lastColor = image:getPixel(0, y)
    local currentWidth = 1

    for x = 1, image.width - 1 do
        local currentColor = image:getPixel(x, y)

        if currentColor == lastColor then
            currentWidth = currentWidth + 1
        else
            if currentWidth < narrowest then narrowest = currentWidth end

            currentWidth = 1
        end

        lastColor = currentColor
    end
end

-- Second, go throught each column - look for the shortest part that doesn't change color
local shortest = image.height

for x = 1, image.width - 1, narrowest do
    local lastColor = image:getPixel(x, 0)
    local currentHeight = 1

    for y = 0, image.height - 1 do

        local currentColor = image:getPixel(x, y)

        if currentColor == lastColor then
            currentHeight = currentHeight + 1
        else
            if currentHeight < shortest then shortest = currentHeight end

            lastColor = currentColor
            currentHeight = 1
        end
    end
end

app.command.SpriteSize {
    ui = false,
    scaleX = 1.0 / narrowest,
    scaleY = 1.0 / shortest,
    method = "nearest"
}
3 Likes
3

I attempted to develop an algorithm that could descale a JPEG but that’s a complete nightmare. :sweat_smile:

1 Like
4

Thank you, this is so clever, and it works brilliantly :smile:

2 Likes