imghead tool

imghead fetch range of image header and decode its dimension. if the server doesn't support range requests, it fetch whole of the content.

Install or update

Install or update:

$ go get -u github.com/koron/imghead

Getting started

Fetch single image header. If it failed, reason of failure is known by its exit code. See below for details.

$ imghead https://pbs.twimg.com/media/DU3Jo_LUMAA0Zpw.jpg
statusCode:206  contentLength:1024      width:900       height:1200     format:jpeg

Fetch single image by arguments

$ imghead http://httpbin.org/image/png https://pbs.twimg.com/media/DU3Jo_LUMAA0Zpw.jpg
http://httpbin.org/image/png    statusCode:200  contentLength:8090      width:100       height:100      format:png
https://pbs.twimg.com/media/DU3Jo_LUMAA0Zpw.jpg statusCode:206  contentLength:1024      width:900       height:1200     format:jpeg

Fetch header of multiple images by file

$ cat testdata/list.txt
https://pbs.twimg.com/media/DVuoPdOV4AEA_rV.jpg
https://pbs.twimg.com/media/DVlbdZ3VQAADJMl.jpg
https://pbs.twimg.com/media/DVkLilJVQAAH1h9.jpg
https://pbs.twimg.com/media/DVab9nmX0AEro8f.jpg
https://pbs.twimg.com/media/DU3Jo_LUMAA0Zpw.jpg

$ imghead -file testdata/list.txt
https://pbs.twimg.com/media/DVab9nmX0AEro8f.jpg statusCode:206  contentLength:1024      width:1200      height:900      format:jpeg
https://pbs.twimg.com/media/DVkLilJVQAAH1h9.jpg statusCode:206  contentLength:1024      width:1200      height:900      format:jpeg
https://pbs.twimg.com/media/DVuoPdOV4AEA_rV.jpg statusCode:206  contentLength:1024      width:900       height:1200     format:jpeg
https://pbs.twimg.com/media/DVlbdZ3VQAADJMl.jpg statusCode:206  contentLength:1024      width:1200      height:900      format:jpeg
https://pbs.twimg.com/media/DU3Jo_LUMAA0Zpw.jpg statusCode:206  contentLength:1024      width:900       height:1200     format:jpeg

Options

-size - size of range query (default: 1024)
-worker - number of parallel download
-file - file for URL list to fetch

Input URLs priority

-file option
arguments
STDIN

Supported image formats

GIF
PNG
JPEG
BMP

Exit code

imghead returns below exit codes when it failed with single argument.

failed to fetch HTTP/S: 2
failed to decode image: 3
other failure: 1

koron / imghead