func Example() {
f, _ := os.Open("firefox.png")
img, _, _ := image.Decode(f)
f.Close()
fmt.Println(dominantcolor.Hex(dominantcolor.Find(img)))
// Output: #CA5527
}
func findAmountOfPurpleInImage(imageFile *os.File) (int, error) {
img, _, err := image.Decode(imageFile)
if err != nil {
return -1, err
}
img = turnGreyIntoWhite(img)
//logImage(img);
dominantColor := dominantcolor.Find(img)
distanceToPurple := coloralgorithms.DistanceBetweenColors(dominantColor, purple)
// The distance should be as small as possible, but the rank should be as high as possible
rank := int(coloralgorithms.MAX_DISTANCE - distanceToPurple)
return rank, nil
}
func BenchmarkFind(b *testing.B) {
f, err := os.Open("firefox.png")
if err != nil {
b.Fatal(err)
}
img, _, err := image.Decode(f)
if err != nil {
b.Fatal(err)
}
f.Close()
for i := 0; i < b.N; i++ {
dominantcolor.Find(img)
}
}
func TestFind(t *testing.T) {
f, err := os.Open("firefox.png")
if err != nil {
t.Fatal(err)
}
img, _, err := image.Decode(f)
if err != nil {
t.Fatal(err)
}
f.Close()
c := dominantcolor.Find(img)
d := distance(c, firefoxOrange)
t.Log("Found dominant color:", dominantcolor.Hex(c))
t.Log("Firefox orange: ", dominantcolor.Hex(firefoxOrange))
t.Logf("Distance: %.2f", d)
if d > 50 {
t.Errorf("Found color is not close.")
}
}
// ProcessImage reads image by reading info and resize optionally to desiredSize, we just print errors and skip to the next element
func (inputInfo ImageInputInfo) ProcessImage(relativerootpath string, basepath string) {
/* first, fetch the data */
f, err := os.Open(inputInfo.InURL)
if err != nil {
fmt.Fprintln(os.Stderr, "Error while reading image ", inputInfo.InURL, err)
return
}
defer f.Close()
sourceimg, _, err := image.Decode(f)
if err != nil {
fmt.Fprintln(os.Stderr, "Couldn't decode image ", inputInfo.InURL, err)
return
}
size := sourceimg.Bounds().Size()
averagecolor := dominantcolor.Hex(dominantcolor.Find(sourceimg))
for scalefactor, widths := range IMGBREAKPOINTS {
for _, width := range widths {
if width > size.X {
fmt.Fprintln(os.Stderr, "Couldn't scale back to ", strconv.Itoa(width), " as the image is ", strconv.Itoa(size.X), " width for ", inputInfo.InURL)
continue
}
outputInfo, err := generateImageAndInfos(inputInfo, relativerootpath, sourceimg, width, int(float32(inputInfo.Cropheight)*scalefactor), averagecolor, basepath)
if err != nil {
fmt.Fprintln(os.Stderr, "An error occured while extracting or saving ", inputInfo.InURL, err)
continue
}
fmt.Print(outputInfo)
}
}
// Add image (eventually cropped) at full width
outputInfo, err := generateImageAndInfos(inputInfo, relativerootpath, sourceimg, -1, inputInfo.Cropheight, averagecolor, basepath)
if err != nil {
fmt.Fprintln(os.Stderr, "An error occured while extracting or saving ", inputInfo.InURL, err)
}
fmt.Print(outputInfo)
}