Comments (5)
n0vad3v
commented on July 20, 2024
From our docs:
Currently supported image format: JPEG, PNG, BMP, GIF, SVG, HEIC
NEF format is currently NOT supported, and the problem seems libwebp related, I've tried using cwebp like:
cwebp DSC_0001.NEF -o output.webp
TIFFReadDirectory: Warning, Unknown field with tag 36867 (0x9003) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 37398 (0x9216) encountered.
Saving file 'output.webp'
File: DSC_0001.NEF
Dimension: 160 x 120
Output: 4310 bytes Y-U-V-All-PSNR 37.27 38.71 39.62 37.81 dB
(1.80 bpp)
block count: intra4: 64 (80.00%)
intra16: 16 (20.00%)
skipped: 6 (7.50%)
bytes used: header: 142 (3.3%)
mode-partition: 335 (7.8%)
Residuals bytes |segment 1|segment 2|segment 3|segment 4| total
macroblocks: | 20%| 21%| 38%| 21%| 80
quantizer: | 36 | 30 | 22 | 16 |
filter level: | 11 | 7 | 4 | 2 |
du -ch DSC_0001.NEF
12M DSC_0001.NEF
12M total
du -ch output.webp
8.0K output.webp
8.0K total
This gives similar results from what you've posted.
from webp_server_go.
llanc
commented on July 20, 2024
How about converting NEF (RAW) images to JPG first and then to WEBP?
from webp_server_go.
n0vad3v
commented on July 20, 2024
How about converting NEF (RAW) images to JPG first and then to WEBP?
No, it's not that easy, NEF images are little bit hard to deal with, for example, if you use file to check for a NEF image, you'll find it has no standard dimension data:
file 1.NEF
1.NEF: TIFF image data, big-endian, direntries=25, height=0, bps=0, compression=none, PhotometricInterpretation=RGB, manufacturer=NIKON CORPORATION, model=NIKON XXXXX, orientation=upper-left, width=0
Note
height=0andwidth=0
So currently we suggest you to convert those NEF images to JPEG or some other supported image formats before using WebP Server Go to render them.
BTW, I've tried https://github.com/rwcarlsen/goexif for extracting info from the above NEF image, and has incorrect results:
package main
import (
"fmt"
"os"
"github.com/rwcarlsen/goexif/exif"
"github.com/rwcarlsen/goexif/mknote"
)
func main() {
nefFile, err := os.Open("1.NEF")
if err != nil {
fmt.Println(err)
}
defer nefFile.Close()
exif.RegisterParsers(mknote.All...)
exifData, err := exif.Decode(nefFile)
if err != nil {
fmt.Println(err)
}
camModel, _ := exifData.Get(exif.Model) // normally, don't ignore errors!
fmt.Println(camModel.StringVal())
XResolution, _ := exifData.Get(exif.XResolution)
YResolution, _ := exifData.Get(exif.YResolution)
ResolutionUnit, _ := exifData.Get(exif.ResolutionUnit)
PixelXDimension, _ := exifData.Get(exif.PixelXDimension)
PixelYDmension, _ := exifData.Get(exif.PixelYDimension)
ImageWidth, _ := exifData.Get(exif.ImageWidth)
ImageLength, _ := exifData.Get(exif.ImageLength)
fmt.Println(XResolution)
fmt.Println(YResolution)
fmt.Println(ResolutionUnit)
fmt.Println(PixelXDimension)
fmt.Println(PixelYDmension)
fmt.Println(ImageWidth)
fmt.Println(ImageLength)
}The output from above program is:
NIKON XXXXX <nil>
"300/1"
"300/1"
2
<nil>
<nil>
160
120
While it's correct dimension is 4608 x 3072.
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llanc
commented on July 20, 2024
I saw a library from https://github.com/gavinwade12/nef2jpeg that can convert NEF to JPG normally: https://github.com/jeremytorres/rawparser
My test results：
NEF
JPG
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llanc
commented on July 20, 2024
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