in reply to Re: Resizing large TIF files
in thread Resizing large TIF files

If his original TIFF images are fax compressed it may takes a bit longer to uncompress them than to decompress LZW, which might explain some of the performance difference. I know libtiff's group 3 compression code was fairly slow way back when I dealt regularly with fax.

You might want to try mixing scaling mode for decent performance, and I'd expect decent quality for scaling monochrome images too (Imager 0.54 +).

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Re^3: Resizing large TIF files
by grantm (Parson) on Nov 21, 2007 at 09:56 UTC

    Ah OK it looks like I'm using a fairly old version of Imager which doesn't support mixing mode - an upgrade is obviously in order.

    By the way Tony, thanks a lot for all the work you've put into Imager it really is an excellent module which I've put to good use on a number of projects.