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https://github.com/liut/jpegquality
Detect JPEG quality in golang
https://github.com/liut/jpegquality
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Detect JPEG quality in golang
- Host: GitHub
- URL: https://github.com/liut/jpegquality
- Owner: liut
- License: mit
- Created: 2016-05-24T16:38:36.000Z (over 8 years ago)
- Default Branch: master
- Last Pushed: 2024-07-10T06:58:29.000Z (7 months ago)
- Last Synced: 2024-07-10T08:55:05.596Z (7 months ago)
- Topics: jpeg
- Language: Go
- Homepage:
- Size: 35.2 KB
- Stars: 7
- Watchers: 3
- Forks: 6
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Detect JPEG quality from bytes or io.ReadSeeker (like os.File)
Input a JPEG file to detect the quality of the image along with the Quanization Table and DQTs.
[](https://travis-ci.org/liut/jpegquality)
Inpiration from [Estimating Quality](http://fotoforensics.com/tutorial-estq.php).
Fixed bug base on HuangYeWuDeng [ttys3/jpegquality](https://github.com/ttys3/jpegquality/commit/6176ce2bb32baad02c5b3dcd977dbc2eab406312).
## Languages/Dependencies:
Golang
## How to Install/Run:
In order to install and run this program, please follow the steps below:
### 1. Clone the repository to your local device
```bash
git clone https://github.com/liut/jpegquality.git
```
### 2. Install Golang:
```bash
Follow this [link](https://go.dev/doc/install) for help.
```
### 3. Build Executable:
```bash
cd jpegq && go build
```
### 4. Run executable and specify input jpeg file.
```bash
jpegq [FILENAME]
Example: jpegq myphoto.jpg
```
## How to Contribute:
### 1. Fork the [main repository](https://github.com/liut/jpegquality)
### 2. Clone the repo to your local device
```bash
git clone https://github.com/liut/jpegquality.git
```
### 3. Install Golang:
```bash
Follow this [link](https://go.dev/doc/install) for help.
```
### 5. Create a new branch for your changes.
```bash
git checkout -b
```
### 6. Submit a Pull Request to the main repository
## Code usage:
````go
file, err := os.Open("file.jpg")
if err != nil {
log.Fatal(err)
}
defer file.Close()
j, err := jpegquality.New(file) // or NewWithBytes([]byte)
if err != nil {
log.Fatal(err)
}
log.Printf("jpeg quality %d", j.Quality())
````
## Testing
This program's output accurracy was tested thoroughly in jpegquality_tests.go. Feel free to add anymore tests for edge cases!
## Bugs
Please report any bugs below to ensure contributors can keep this code functional and easy to use
## Command line tool
```sh
go get github.com/liut/jpegquality/cmd/jpegq
jpegq myphoto.jpg
```
### Output example
```
2019/10/03 00:09:08 jpegquality.go:135: Quantization table length 130
2019/10/03 00:09:08 jpegquality.go:144: read bytes 130
2019/10/03 00:09:08 jpegquality.go:161: DQT: table index 0 (luminance), precision: 8
2019/10/03 00:09:08 jpegquality.go:208: tbl 0: 23.90413 572.61780 88.04793
2019/10/03 00:09:08 jpegquality.go:212: aver_quality 88
88
```
## Custom logger for debug
```go
jpegquality.SetLogger(log.New(os.Stderr, "jpegq", log.LstdFlags|log.Lshortfile))
```