Created
December 31, 2021 16:06
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Image processing example in Go
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| package util | |
| import ( | |
| "fmt" | |
| "image" | |
| "image/color" | |
| "io" | |
| "log" | |
| "text/template" | |
| "github.com/nfnt/resize" | |
| ) | |
| const ascii_artT = ` | |
| <html> | |
| <pre> | |
| {{ .Art }} | |
| </pre> | |
| </html> | |
| ` | |
| func LoadAsciiArtT(name string) (*template.Template, error) { | |
| tmpl, err := template.New(name).Parse(ascii_artT) | |
| if err != nil { | |
| log.Println(err) | |
| return nil, err | |
| } | |
| return tmpl, nil | |
| } | |
| func AsciiArt(f io.Reader) (string, error) { | |
| var ascii_art string | |
| var grayRamp = "$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/|()1{}[]?-_+~<>i!lI;:,\"^`\\" | |
| var rampLength = len(grayRamp) | |
| imData, imType, err := image.Decode(f) | |
| if err != nil { | |
| return ascii_art, err | |
| } | |
| log.Println(imType) | |
| newImage := resize.Resize(80, 0, imData, resize.Lanczos3) | |
| for y := newImage.Bounds().Min.Y; y < newImage.Bounds().Max.Y; y++ { | |
| for x := newImage.Bounds().Min.X; x < newImage.Bounds().Max.X; x++ { | |
| c := color.GrayModel.Convert(newImage.At(x, y)).(color.Gray) | |
| level := (rampLength - 1) * int(c.Y) / 255 | |
| ascii_art = fmt.Sprint(ascii_art + string(grayRamp[level]) + string(grayRamp[level])) | |
| } | |
| ascii_art = fmt.Sprint(ascii_art + "\n") | |
| } | |
| return ascii_art, nil | |
| } |
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Ps. obviously if you want to get rid of some of the garbage collector overhead just use some byte slices backed by fixed size byte arrays.