identify - force header only

[msundell]

Is it possible to force the identify command to only read the header of an image file (if possible) instead of reading the whole file before output.
I'm interested in getting back the width/height quickly without loading image data.
Mikael

[dlemstra]

Identify does not load all the image data unless you specify -verbose. What is the type of image you are trying to get the information from? Maybe the coder for that format has to read all the data before it can give you the width/height.

[fmw42]

Code: Select all

identify -format "%wx%h" yourimage

see string formats at http://www.imagemagick.org/script/escape.php

[msundell]

You're right as a test I did: format %[fx:w]x[fx:h] from the inch example and it forces a complete image load
Using format %wx%h works as expected, perfect.
Mikael

[snibgo]

If you need calculations from image dimensions, "convert" with "-ping" and "fx:" doesn't read the pixels:

Code: Select all

convert -ping g.png -format "%[fx:w/3]\n%[fx:h/3]" info: