On Thu, 2009-05-14 at 19:51 +0400, Alexandre Prokoudine wrote:
> On Thu, May 14, 2009 at 7:43 PM, Liam R E Quin wrote:
> 
> > Go to tool options, choose "corrective mode" and preview "grid".
> > Now, align the grid with the item in your picture that you want to
> > be horizontal or vertical, and click rotate.
> 
> In fact every time you will also need to create a different number of
> grid lines so that one of them would be as close as possible to a
> potentially horizontal/vertical feature. Straightening with a line the
> way Maciej described it would make it much easier.

Agreed, just wanted to make sure Maciej knew what we already have.

Actually, paintShopPro lets you draw a line, and PhotoShop lets you
rotate to an angled guide, but, except for the difficulty of aligning
the grid, which I see as a separate issue, the GIMP approach is vastly
superior, because you can check alignment against several parts of
the image, both horizontal and vertical.  But yes, it needs to be
streamlined, you are right.

Liam


-- 
Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Pictures from old books: http://fromoldbooks.org/
Ankh: irc.sorcery.net irc.gnome.org www.advogato.org

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