[Image-SIG] adding overlay & text to many files

[Stani]

Op woensdag 14-01-2009 om 16:49 uur [tijdzone +0100], schreef Frédéric:
> Le 14/1/2009, "Bernard Rankin" <berankin99 at yahoo.com> a écrit:
> 
> >I'm sure this must be a common question, but I could not find any docs on this.  Perhapse my google skills needs improvment.
> >
> >Basically, I've got a bunch of pictures from a party/event that I want to do several things to:
> >
> >1)  Resize to 4x6 @ 300 PPI
> >2)  Add a slightly translucent ~ 1" white bar on top of the image (across the bottom).
> >3)  Over the white bar, on the left, place a small 1"x1" logo.
> >4)  Over the white bar, centered on the remainder, put the names of the people in the photo. (Reducing text size if needed to fit on one line.)
> >5)  Over the white bar, centered on the remainder, put the name of the event on the next line.
> >6)  Add a black border to entire image.
> >7)  Export as JPEG.
> >
> >There is a CSV file that contains the "names of the people in each photo" to file name mapping.  (One line per image file.)
> >
> >Can this be automated with the PIL?
> >
> >The biggest challenge I imagine would be the step 4 that needs to auto-resize text to fit in a certain area....  That is, it's a single-line text box such that the text inside starts out at some desired size, but is
> >automatically shrunk (in font size) to fit the width of the box if the
> >supplied text is too long.
> >
> >Additionally, for the overlay, it would be nice to use a GIMP file with dummy text as a template that I can supply the correct text and base image file.  Is this possible with PIL?
> 
> I think that it is possible to do all you want. First, I would suggest
> you have a look at Phatch, a great batch processor, build on PIL. Step
> 1, 6 and 7 are already done in Phatch default actions.
And you would get 2 and 3 also for free. For both steps you can use the
watermark action: once with a fixed translucent white bar image (.png)
and once with the logo.

> 
> Then, I would write a few Phatch actions to match your needs. I would
> first build an transparent image with the logo and names, then merge
> this image with the original.
> 
> I agree that the tricky part is the text. Anyway, you can start to
> prototype this with PIL, then turn your code into a Phatch action to
> have a great batch processor.
Phatch has already a text action which has done the hard work already as
well. Just start from that as a base and hack it to use a csv file as
input instead of a fixed text. If you have played with python and PIL
already, it should be not that hard.

BTW Phatch can be used as a desktop application but also as a server
process without a GUI, once you have your action configured.

Phatch is available in Ubuntu Intrepid, Fedora, Suse, Arch Linux, ... in
the usual repositories. The latest version is 0.1.x (where x are bug fix
releases which you probably don't need).

Stani