Mercurial > repos > ImageTools / changeset

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ColourTools.jl	Sat Dec 04 09:08:24 2021 +0200
@@ -0,0 +1,30 @@
+
+#############################################
+# Utilities to work with colourmapped images
+#############################################
+
+module ColourTools
+
+using ColorTypes: Gray
+
+# Our exports
+
+export grayimg,
+       mapped_img,
+       clip
+
+# Clip image values to allowed range
+clip = x -> min(max(x, 0.0), 1.0)
+
+# Tell that raw image data is grayscale
+grayimg = im -> Gray.(clip.(im))
+
+# Apply a colourmap (vector of RGB objects) to raw image data
+function mapped_img(im, cmap)
+    l = length(cmap)
+    apply = t -> cmap[1+round(UInt8, clip(t) * (l-1))]
+    return apply.(im)
+end
+
+end
+