On 4-8-2011 20:54, Gelonida N wrote: > The reason why I want the images to look identical is very simple. > Though the final web server will run on a linux server, I use sometimes > windows for development or as test server. > > For automated tests I would have liked pixel identical images. > this allows calculating the md5sum of images to know whether > a regression in the image layout occured. Well I can live without it.
Then don't run your automated tests on the dev server but deploy your stuff to a separate test server first, that runs the same software as production. And run the tests there. > The second (more import issue) is, that the images should look the same > whether created on a Windows or Linux host. > > I didn't know that PIL delegated font rendering to the underlying OS, > but thought it contains its own rendering. I'm pretty sure it does have that indeed; it links with the freetype library. Are you sure you're not just seeing differences because of differences in the typeface itself? A courier.ttf on one system can look very different from a ms-courier-new.ttf on another... > Here the problem is not if a few pixels are different, but currently I > even don't know how to choose a font, and make sure it exists on both > platforms. I also don't know how I can write portable python code, that > will find a given font on windows and on linux independent of the exact > font location. I once made a module that uses PIL to draw captcha images. It uses one of the free truetype font files that I just place next to the code. I downloaded the ttf files from http://www.fontgirl.com/ but there are dozens of free font sites. Just be sure to check the license terms of the the typeface files. As far as I know, I did not see any difference in output on windows, linux and mac os x as long as the code used the same ttf file and PIL versions. (but I'll double check now and see if I remember this correctly). Irmen -- http://mail.python.org/mailman/listinfo/python-list
