by steve.wangbin:

What steps will reproduce the problem?
use image.jpeg.Decode to decode some jpeg files one of which has been attached.

If possible, include a link to a program on play.golang.org.
the program is quite simple as below:
package main

import (
    "fmt"
    "image/jpeg"
    "os"
)

func main() {
    if len(os.Args) != 2 {
        return
    }
    f, err := os.Open(os.Args[1])
    if err != nil {
        fmt.Println(err.Error())
        return
    }
    defer f.Close()
    img, err := jpeg.Decode(f)
    if err != nil {
        fmt.Println(err.Error())
        return
    }
    _ = img
}

What is the expected output?
no output

What do you see instead?
unsupported JPEG feature: luma downsample ratio

Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?
ubuntu 12.04.1 x86_64

Which version are you using?  (run 'go version')
1.0.3

Please provide any additional information below.
https://groups.google.com/forum/?fromgroups=#!topic/golang-nuts/Soo54p35dmk

Attachments:

1. _MG_7715.JPG (2879432 bytes)