A-M baby

Task/Image-convolution/Go/image-convolution-3.go

@@ -0,0 +1,40 @@
+package main
+
+// Files required to build supporting package raster are found in:
+// * This task (immediately above)
+// * Bitmap
+// * Grayscale image
+// * Read a PPM file
+// * Write a PPM file
+
+import (
+    "fmt"
+    "raster"
+)
+
+var blur = []float64{
+    1./9, 1./9, 1./9,
+    1./9, 1./9, 1./9,
+    1./9, 1./9, 1./9}
+
+var sharpen = []float64{
+    -1, -1, -1,
+    -1,  9, -1,
+    -1, -1, -1}
+
+func main() {
+    // Example file used here is Lenna100.jpg from the task "Percentage
+    // difference between images" converted with with the command
+    // convert Lenna100.jpg -colorspace gray Lenna100.ppm
+    b, err := raster.ReadPpmFile("Lenna100.ppm")
+    if err != nil {
+        fmt.Println(err)
+        return
+    }
+    g0 := b.Grmap()
+    g1 := g0.KernelFilter3(blur)
+    err = g1.Bitmap().WritePpmFile("blur.ppm")
+    if err != nil {
+        fmt.Println(err)
+    }
+}