ae873551ff
-Updated the convolution sample factory to do a proper convolution, reading from the backup. There is still no colormapping. git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1262 416bcca6-2ee7-4201-b75f-2eb2f807beb1
29 lines
897 B
Lua
29 lines
897 B
Lua
-- Get the picture size
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w, h = getpicturesize();
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-- Here is the filtering matrix
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matrix = {
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{ 0, -1, 0 },
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{ -1, 5, -1 },
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{ 0, -1, 0 }};
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-- Loop trough all the pixels
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-- To make this script simpler we don't handle the picture borders
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-- (the matrix would get pixels outside the picture space)
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-- for var = start_value, end_value, step do ...
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for y = 1, h - 2, 1 do
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for x = 1, w - 2, 1 do
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filtered =
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matrix[1][1] * getbackuppixel(x - 1, y - 1) +
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matrix[1][2] * getbackuppixel(x , y - 1) +
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matrix[1][3] * getbackuppixel(x + 1, y - 1) +
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matrix[2][1] * getbackuppixel(x - 1, y ) +
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matrix[2][2] * getbackuppixel(x , y ) +
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matrix[2][3] * getbackuppixel(x + 1, y ) +
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matrix[3][1] * getbackuppixel(x - 1, y + 1) +
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matrix[3][2] * getbackuppixel(x , y + 1) +
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matrix[3][3] * getbackuppixel(x + 1, y + 1);
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putpicturepixel(x,y,filtered);
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end
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end
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