PSD/PSB(Photoshop) file reader for Go programming language
It works almost well but it is still in development.
How to use
Example1
Simple psd -> png conversion.
package main
import (
"image"
"image/png"
"os"
_ "github.com/oov/psd"
)
func main() {
file, err := os.Open("image.psd")
if err != nil {
panic(err)
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
panic(err)
}
out, err := os.Create("image.png")
if err != nil {
panic(err)
}
err = png.Encode(out, img)
if err != nil {
panic(err)
}
}
Example2
Extract all layer images.
package main
import (
"fmt"
"image/png"
"os"
"github.com/oov/psd"
)
func processLayer(filename string, layerName string, l *psd.Layer) error {
if len(l.Layer) > 0 {
for i, ll := range l.Layer {
if err := processLayer(
fmt.Sprintf("%s_%03d", filename, i),
layerName+"/"+ll.Name, &ll); err != nil {
return err
}
}
}
if !l.HasImage() {
return nil
}
fmt.Printf("%s -> %s.png\n", layerName, filename)
out, err := os.Create(fmt.Sprintf("%s.png", filename))
if err != nil {
return err
}
defer out.Close()
return png.Encode(out, l.Picker)
}
func main() {
file, err := os.Open("image.psd")
if err != nil {
panic(err)
}
defer file.Close()
img, _, err := psd.Decode(file, &psd.DecodeOptions{SkipMergedImage: true})
if err != nil {
panic(err)
}
for i, layer := range img.Layer {
if err = processLayer(fmt.Sprintf("%03d", i), layer.Name, &layer); err != nil {
panic(err)
}
}
}
Current status
It is not implemented any blending functions because layer composition isn't covered by this package at present.
- Image Resource Section is parsed but Image resource IDs are not defined as constant.
- Global layer mask info is not parsed.
- Layer blending ranges data is not parsed.
- Additional Layer Information is parsed but keys are almost not defined as constant.
Color Modes
Implemented
- Bitmap 1bit
- Grayscale 8bit
- Grayscale 16bit
- Grayscale 32bit
- Indexed
- RGB 8bit
- RGB 16bit
- RGB 32bit
- CMYK 8bit
- CMYK 16bit
Not implemented
- CMYK 32bit
- Multichannel
- Duotone
- Lab
Supported Compression Methods
- Raw
- RLE(PackBits)
- ZIP without prediction (not tested)
- ZIP with prediction