<[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > [EMAIL PROTECTED] wrote: > >> I looked at the PIL Image class but cannot see a posibility to retreive >> the image resolution dots per inch (or pixels per inch) > > Not all formats provide a DPI value; since PIL doesn't do anything with > DPI it's not part of the main interface.
Digital images intrinsically have a size in pixels, not a 'resolution'. Resolutions (dpi or whatever) represent relationships and transformations between images and physical substrates. Somes images have an input transform, though for digital cameras, the input dpi or dpm(illimeter) of the ccd imager is seldom useful. Some have one *or more* output transforms. Some have both. So I think the option i/o transforms are best thought of and kept as 'extra' data. (The same applies to strings and I/O formats.) Terry J. Reedy Terry J. Reedy -- http://mail.python.org/mailman/listinfo/python-list
