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HDR is a library that handles RAW image format written with Golang
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mdouchement/hdr
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HDR is a library that handles RAW image format written with Golang.Here some rendering examples.
It aims to provide tools to readHDR files and convert it to a LDR (Low Dynamic Range, aka PNG/JPEG/etc.) in animage.Image object.
Documentations:
- Radiance RGBE/XYZE
- PFM, Portable FloatMap file format
- TIFF usingmdouchement/tiff
- CRAD, homemade HDR file format
Read thisdocumentation to find what TMO use.
Read thisdocumentation to understand what is a TMO.
- Linear
- Logarithmic
- Drago '03 - Adaptive logarithmic mapping for displaying high contrast scenes
- Durand - Fast bilateral filtering for the display of high-dynamic-range images
- Reinhard '05 - Photographic tone reproduction for digital images
- Playing with parameters could provide better rendering
- Custom Reinhard '05
- Rendering looks like a JPEG photo taken with a smartphone
- iCAM06 - A refined image appearance model for HDR image rendering
go get github.com/mdouchement/hdr
package mainimport ("fmt""image""image/png""os""runtime""time""github.com/mdouchement/hdr"_"github.com/mdouchement/hdr/codec/rgbe""github.com/mdouchement/hdr/tmo")// Samples://// http://www.anyhere.com/gward/hdrenc/pages/originals.html// http://resources.mpi-inf.mpg.de/tmo/logmap/ (High Contrast Scenes)var (// input = "/Users/mdouchement/tmp/hdr/memorial_o876.hdr"// input = "/Users/mdouchement/tmp/hdr/MtTamWest_o281.hdr"// input = "/Users/mdouchement/tmp/hdr/rend02_oC95.hdr"// input = "/Users/mdouchement/tmp/hdr/Tree_oAC1.hdr"input="/Users/mdouchement/tmp/hdr/Apartment_float_o15C.hdr"output="/Users/mdouchement/tmp/hdr/output.png")funcmain() {fmt.Printf("Using %d CPUs\n",runtime.NumCPU())fi,err:=os.Open(input)check(err)deferfi.Close()start:=time.Now()m,fname,err:=image.Decode(fi)check(err)fmt.Printf("Read image (%s) took %v\n",fname,time.Since(start))ifhdrm,ok:=m.(hdr.Image);ok {startTMO:=time.Now()// t := tmo.NewLinear(hdrm)// t := tmo.NewLogarithmic(hdrm)// t := tmo.NewDefaultDrago03(hdrm)// t := tmo.NewDefaultDurand(hdrm)// t := tmo.NewDefaultCustomReinhard05(hdrm)t:=tmo.NewDefaultReinhard05(hdrm)// t := tmo.NewDefaultICam06(hdrm)m=t.Perform()fmt.Println("Apply TMO took",time.Since(startTMO))}fo,err:=os.Create(output)check(err)png.Encode(fo,m)fmt.Println("Total",time.Since(start))}funccheck(errerror) {iferr!=nil {panic(err)}}
https://github.com/mdouchement/hdrtool
MIT
A TMO must implementtmo.ToneMappingOperator:
typeToneMappingOperatorinterface {// Perform runs the TMO mapping.Perform() image.Image}
- Reader
// DecodeConfig returns the color model and dimensions of a PFM image without// decoding the entire image.funcDecodeConfig(r io.Reader) (image.Config,error) {// ...returnm,err}// Decode reads a HDR image from r and returns an image.Image.funcDecode(r io.Reader) (img image.Image,errerror) {// ...return}funcinit() {// Register the format in the official lib.// https://golang.org/pkg/image/#RegisterFormatimage.RegisterFormat("format-name","magic-code",Decode,DecodeConfig)}
- Writer
// Encode writes the Image m to w in PFM format.funcEncode(w io.Writer,m hdr.Image)error {returnnil}
All PRs are welcome. If you implement a TMO or an image codec in a dedicated repository, please tell me in order to link it in this readme.
- Fork it
- Create your feature branch (git checkout -b my-new-feature)
- Commit your changes (git commit -am 'Add some feature')
- Push to the branch (git push origin my-new-feature)
- Create new Pull Request
As possible, run the following commands to format and lint the code:
# Formatfind. -name'*.go' -not -path'./vendor*' -exec gofmt -s -w {}\;# Lintgolangci-lint run -c .golangci.yml
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HDR is a library that handles RAW image format written with Golang
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