PIL: match for ImageMagick's display -ping

[Torsten Bronger]

Hallöchen!

I have to extract the dimensions of many bitmap files. An old Bash
script did it with ImageMagick's "display -ping ...". "-ping" means
that it extracts the image dimensions efficiently. I suspect it
simply doesn't read the image itself.

Now the Bash script has been transformed into Python+PIL. Is there
a way to get the dimensions equally efficient here, or does the PIL
even do this optimisation implicitly since I never access the image
bitmap itself?

Thank you!

Tschö,
Torsten.

 

[Steve Holden]

Hallöchen!

I have to extract the dimensions of many bitmap files. An old Bash
script did it with ImageMagick's "display -ping ...". "-ping" means
that it extracts the image dimensions efficiently. I suspect it
simply doesn't read the image itself.

Now the Bash script has been transformed into Python+PIL. Is there
a way to get the dimensions equally efficient here, or does the PIL
even do this optimisation implicitly since I never access the image
bitmap itself?

The image data isn't read until an operation requires it, so this is an
efficient way to get its size.

regards
Steve