Bilinear interpolation: Difference between revisions
Added Sidef
(→{{header|Python}}: Handle grey scale images) |
(Added Sidef) |
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Line 361:
(flomap-bilinear-ref
fm k (+ 1/2 (/ x 250)) (+ 1/2 (/ y 250))))))</lang>
=={{header|Sidef}}==
{{trans|C}}
<lang ruby>require('Imager')
func scale(img, scaleX, scaleY) {
var (width, height) = (img.getwidth, img.getheight)
var (newWidth, newHeight) = (int(width*scaleX), int(height*scaleY))
var out = %O<Imager>.new(xsize => newWidth, ysize => newHeight)
var lerp = { |s, e, t|
s + t*(e-s)
}
var blerp = { |c00, c10, c01, c11, tx, ty|
lerp(lerp(c00, c10, tx), lerp(c01, c11, tx), ty)
}
for x,y in (^newWidth ~X ^newHeight) {
var gxf = (x/newWidth * (width - 1))
var gyf = (y/newHeight * (height - 1))
var gx = gxf.int
var gy = gyf.int
var *c00 = img.getpixel(x => gx, y => gy ).rgba
var *c10 = img.getpixel(x => gx+1, y => gy ).rgba
var *c01 = img.getpixel(x => gx, y => gy+1).rgba
var *c11 = img.getpixel(x => gx+1, y => gy+1).rgba
var rgb = 3.of { |i|
blerp(c00[i], c10[i], c01[i], c11[i], gxf - gx, gyf - gy).int
}
out.setpixel(x => x, y => y, color => rgb)
}
return out
}
var img = %O<Imager>.new(file => "input.png")
var out = scale(img, 1.6, 1.6)
out.write(file => "output.png")</lang>
=={{header|Tcl}}==
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