2007.07.12 15:21 "[Tiff] how to rotate an image", by Oliver Geisen

2007.07.12 15:30 "Re: [Tiff] how to rotate an image", by Andy Cave

Hi Oliver,

How large are the images you're rotating? Our pre-press product FirstPROOF has the ability to rotate 1-bit images, by 90, 180 or 270 degrees, very fast, however big they are, whether they are striped or tiled. I can tell you that writing such code to be efficient for any sized images (and leaving a resulting image that is sequentially accessed on disk for subsequent maximum i/o performance) is not a trivial task. If you're not an experienced s/w engineer, I would suggest you hire one.



Andy Cave,
Chief Executive Officer,
Hamillroad Software Limited.

how can i rotate an tiff image by 180 degrees (from head-up to head- down)?

For now i use Strip-reading bottom-up and scanline writing top-down. The problem is that i also have to swob all bits of each scanline horizontaly (byte and bit swob) and don't know how to handle this effectivly.

Any ideas about that?